{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74363", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.887Z", "datePublished": "2026-08-15T05:58:46.220Z", "dateUpdated": "2026-08-17T05:46:21.981Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:46:21.981Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix UAF by restoring RCU-delayed inode freeing in bpffs\n\ncommit 4f375ade6aa9 (\"bpf: Avoid RCU context warning when unpinning\nhtab with internal structs\") moved inode cleanup from ->free_inode()\ninto ->destroy_inode() to avoid sleeping in RCU context when calling\nbpf_any_put(). However this removed the RCU delay on freeing the\ninode itself and the cached symlink body (i_link), both of which\ncan be accessed by RCU pathwalk (pick_link, may_lookup etc.).\n\nThis causes a use-after-free when a concurrent unlinkat() drops the\nlast inode reference and destroy_inode() frees the inode immediately,\nwhile another task is still walking the path in RCU mode and reads\ninode->i_opflags (offset +2) inside current_time() -> is_mgtime().\n\nKASAN reports:\n BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313\n Read of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags)\n\nThe rules (per Al Viro):\n ->destroy_inode() called immediately, can sleep, use for blocking\n cleanup e.g. bpf_any_put()\n ->free_inode() called after RCU grace period, use for freeing\n inode and anything RCU-accessible e.g. i_link\n\nFix: split the two concerns properly:\n - keep bpf_any_put() in bpf_destroy_inode() since it is blocking\n and needs to run promptly\n - introduce bpf_free_inode() to handle kfree(i_link) and\n free_inode_nonrcu() with proper RCU delay, preventing the UAF"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is triggered through local VFS and bpf(2) syscalls on bpffs (unlinkat/symlinkat/openat/stat and BPF_OBJ_GET/BPF_OBJ_PIN) racing RCU pathwalk; BPF/bpffs is not reachable from remote network services.\nAC:L - Exploitation requires a race between unlinkat dropping the last bpffs inode reference and concurrent RCU pathwalk, but the attacker controls both sides with parallel threads/syscalls and syzbot reliably reproduces the UAF without external timing.\nPR:L - Any local user with write access to a bpffs mount (default sticky world-writable /sys/fs/bpf) can create symlinks or pin/unpin BPF objects without init-namespace root, including via unprivileged BPF or delegated bpffs mounts in user namespaces.\nUI:N - No victim action is required; the attacker programmatically races their own unlink/pathwalk operations on bpffs objects they can create and remove.\nS:U - This is a kernel heap use-after-free in bpffs inode lifetime management, enabling local privilege escalation within the same security domain rather than crossing VM, IOMMU, or sandbox boundaries.\nC:H - KASAN confirmed slab use-after-free reading freed inode->i_opflags during RCU pathwalk; UAF of struct inode enables subsequent arbitrary kernel memory disclosure via heap reuse.\nI:H - Premature inode freeing permits attacker-controlled heap reuse and spraying, providing a standard kernel UAF path to arbitrary write and potential code execution beyond the initial 2-byte read.\nA:H - Concurrent RCU pathwalk of a prematurely freed bpffs inode triggers KASAN slab-UAF and kernel oops; repeated triggering can panic the system or cause denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/inode.c"], "versions": [{"version": "e28616ca3d67e745ecb2f10eba4a626e1fc9a203", "lessThan": "ea1c243c39e32b7fc1c2edfe32081ff7e30a877c", "status": "affected", "versionType": "git"}, {"version": "743a620c661994c7f0938e6dd32fb0883fb1e0ea", "lessThan": "5fecb71c10c28aef276ba49c718dc961745fdcf0", "status": "affected", "versionType": "git"}, {"version": "b6e9645be9eb93f7aff3ca887f8edb6f1d63358f", "lessThan": "c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2", "status": "affected", "versionType": "git"}, {"version": "ee04cff9ed4d6bb25802f5cecfcd0750500410f3", "lessThan": "53649846e0437d1d9b7cb993cfe54c367addf7ae", "status": "affected", "versionType": "git"}, {"version": "4f375ade6aa9f37fd72d7a78682f639772089eed", "lessThan": "61f19729728243c82476dee31315143ed3275e7f", "status": "affected", "versionType": "git"}, {"version": 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"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/inode.c"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ea1c243c39e32b7fc1c2edfe32081ff7e30a877c", "status": "affected", "version": "e28616ca3d67e745ecb2f10eba4a626e1fc9a203", "versionType": "git"}, {"lessThan": "5fecb71c10c28aef276ba49c718dc961745fdcf0", "status": "affected", "version": "743a620c661994c7f0938e6dd32fb0883fb1e0ea", "versionType": "git"}, {"lessThan": "c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2", "status": "affected", "version": "b6e9645be9eb93f7aff3ca887f8edb6f1d63358f", "versionType": "git"}, {"lessThan": "53649846e0437d1d9b7cb993cfe54c367addf7ae", "status": "affected", "version": "ee04cff9ed4d6bb25802f5cecfcd0750500410f3", "versionType": "git"}, {"lessThan": "61f19729728243c82476dee31315143ed3275e7f", "status": "affected", "version": "4f375ade6aa9f37fd72d7a78682f639772089eed", "versionType": "git"}, {"lessThan": "0497ff765746d9b2d17445c8f7cc737b36c0152a", "status": "affected", "version": "4f375ade6aa9f37fd72d7a78682f639772089eed", "versionType": "git"}, {"lessThan": "b93c55b4932dd7e32dca8cf34a3443cc87a02906", "status": "affected", "version": "4f375ade6aa9f37fd72d7a78682f639772089eed", "versionType": "git"}, {"status": "affected", "version": "de2d2baecc84cc7fca52eec2b9b55d89c93e3565", "versionType": "git"}, {"lessThan": "5.15.212", "status": "affected", "version": "5.15.195", "versionType": "semver"}, {"lessThan": "6.1.178", "status": "affected", "version": "6.1.157", "versionType": "semver"}, {"lessThan": "6.6.145", "status": "affected", "version": "6.6.113", "versionType": "semver"}, {"lessThan": "6.12.97", "status": "affected", "version": "6.12.54", "versionType": "semver"}, {"lessThan": "6.18", "status": "affected", "version": "6.17.4", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"lessThan": "6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix UAF by restoring RCU-delayed inode freeing in bpffs\n\ncommit 4f375ade6aa9 (\"bpf: Avoid RCU context warning when unpinning\nhtab with internal structs\") moved inode cleanup from ->free_inode()\ninto ->destroy_inode() to avoid sleeping in RCU context when calling\nbpf_any_put(). However this removed the RCU delay on freeing the\ninode itself and the cached symlink body (i_link), both of which\ncan be accessed by RCU pathwalk (pick_link, may_lookup etc.).\n\nThis causes a use-after-free when a concurrent unlinkat() drops the\nlast inode reference and destroy_inode() frees the inode immediately,\nwhile another task is still walking the path in RCU mode and reads\ninode->i_opflags (offset +2) inside current_time() -> is_mgtime().\n\nKASAN reports:\n BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313\n Read of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags)\n\nThe rules (per Al Viro):\n ->destroy_inode() called immediately, can sleep, use for blocking\n cleanup e.g. bpf_any_put()\n ->free_inode() called after RCU grace period, use for freeing\n inode and anything RCU-accessible e.g. i_link\n\nFix: split the two concerns properly:\n - keep bpf_any_put() in bpf_destroy_inode() since it is blocking\n and needs to run promptly\n - introduce bpf_free_inode() to handle kfree(i_link) and\n free_inode_nonrcu() with proper RCU delay, preventing the UAF"}], "id": "CVE-2026-74363", "lastModified": "2026-08-17T06:19:31.050", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:37.900", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0497ff765746d9b2d17445c8f7cc737b36c0152a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/53649846e0437d1d9b7cb993cfe54c367addf7ae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5fecb71c10c28aef276ba49c718dc961745fdcf0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/61f19729728243c82476dee31315143ed3275e7f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b93c55b4932dd7e32dca8cf34a3443cc87a02906"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ea1c243c39e32b7fc1c2edfe32081ff7e30a877c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs", "id": "2516930", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516930"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-821", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: fix UAF by restoring RCU-delayed inode freeing in bpffs\ncommit 4f375ade6aa9 (\"bpf: Avoid RCU context warning when unpinning\nhtab with internal structs\") moved inode cleanup from ->free_inode()\ninto ->destroy_inode() to avoid sleeping in RCU context when calling\nbpf_any_put(). However this removed the RCU delay on freeing the\ninode itself and the cached symlink body (i_link), both of which\ncan be accessed by RCU pathwalk (pick_link, may_lookup etc.).\nThis causes a use-after-free when a concurrent unlinkat() drops the\nlast inode reference and destroy_inode() frees the inode immediately,\nwhile another task is still walking the path in RCU mode and reads\ninode->i_opflags (offset +2) inside current_time() -> is_mgtime().\nKASAN reports:\nBUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313\nRead of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags)\nThe rules (per Al Viro):\n->destroy_inode() called immediately, can sleep, use for blocking\ncleanup e.g. bpf_any_put()\n->free_inode() called after RCU grace period, use for freeing\ninode and anything RCU-accessible e.g. i_link\nFix: split the two concerns properly:\n- keep bpf_any_put() in bpf_destroy_inode() since it is blocking\nand needs to run promptly\n- introduce bpf_free_inode() to handle kfree(i_link) and\nfree_inode_nonrcu() with proper RCU delay, preventing the UAF", "A flaw was found in the Linux kernel's BPF filesystem (bpffs). An incorrect inode cleanup process allowed an inode and its associated symlink data to be freed immediately, without proper synchronization. A local attacker could exploit this by concurrently unlinking a file while another process was still accessing its path. This could lead to a use-after-free vulnerability, potentially causing system instability or a denial of service."], "name": "CVE-2026-74363", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74363\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74363\nhttps://lore.kernel.org/linux-cve-announce/2026081501-CVE-2026-74363-e3cf@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e28616ca3d67e745ecb2f10eba4a626e1fc9a203,ea1c243c39e32b7fc1c2edfe32081ff7e30a877c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[743a620c661994c7f0938e6dd32fb0883fb1e0ea,5fecb71c10c28aef276ba49c718dc961745fdcf0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b6e9645be9eb93f7aff3ca887f8edb6f1d63358f,c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ee04cff9ed4d6bb25802f5cecfcd0750500410f3,53649846e0437d1d9b7cb993cfe54c367addf7ae)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4f375ade6aa9f37fd72d7a78682f639772089eed,61f19729728243c82476dee31315143ed3275e7f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4f375ade6aa9f37fd72d7a78682f639772089eed,0497ff765746d9b2d17445c8f7cc737b36c0152a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4f375ade6aa9f37fd72d7a78682f639772089eed,b93c55b4932dd7e32dca8cf34a3443cc87a02906)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "de2d2baecc84cc7fca52eec2b9b55d89c93e3565"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.195,5.15.212)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.157,6.1.178)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.113,6.6.145)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.54,6.12.97)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.17.4,6.18)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T13:30:04.659729+00:00", "updated": "2026-08-22T03:00:12.231760+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-821"]}