{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97594", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T16:01:01.157Z", "datePublished": "2026-09-25T10:22:10.548Z", "dateUpdated": "2026-09-25T14:41:27.794Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-25T14:41:27.794Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlandlock: Fix use-after-free of the source's parent directory\n\ncurrent_check_refer_path() reads old_dentry->d_parent without holding a\nreference nor a lock on it, and then dereferences it in\ncollect_domain_accesses() and in the audit record.\n\nA reference on a child does not pin its parent: __d_move() reassigns\ndentry->d_parent and drops the reference the child held on its former\nparent. hook_path_rename() is not affected because the rename path\ncalls lock_rename() before the hook, so the source cannot be reparented\nunder it. hook_path_link() has no such protection: filename_linkat()\nholds a reference on the source dentry but neither locks nor references\nits parent, so a concurrent rename(2) can reparent the source while\nsecurity_path_link() runs, and the former parent can then be removed and\nfreed while the hook walks it.\n\nA process can trigger this after entering a Landlock domain that handles\nat least one filesystem access right. The process can then race a\nlinkat(2) loop against rename(2) and rmdir(2):\n\n BUG: KASAN: slab-use-after-free in collect_domain_accesses+0x278/0x290\n Read of size 4 at addr ffff888160bd53f4 by task llrepro2/549\n collect_domain_accesses+0x278/0x290\n current_check_refer_path+0x952/0x1120\n security_path_link+0x1be/0x320\n filename_linkat+0x342/0x6d0\n __x64_sys_linkat+0xfa/0x150\n Freed by task 562:\n kmem_cache_free+0x139/0x4c0\n i_callback+0x4b/0x80\n rcu_core+0x7dc/0x10a0\n\nTake a reference on the dentry selected as the source parent, using\ndget() for the common-mount-root case and dget_parent() otherwise.\nRelease it after the hierarchy walk and synchronous audit logging.\n\n[mic: Clarify the caller, reachability, and reference handling]"}], "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 trigger is a local linkat(2) syscall: filename_linkat() -> security_path_link() -> hook_path_link() -> current_check_refer_path(), raced against local rename(2)/rmdir(2). No remote protocol supplies any of the input.\nAC:L - The attacker runs every side of the race: a linkat() loop on their own file, plus rename() to reparent the source and rmdir() to free the old parent, all in directories they create (e.g. /tmp). No condition outside the attacker's control is needed; the window can be retried at will.\nPR:L - An ordinary unprivileged user can enter a Landlock domain that handles any FS right (landlock_create_ruleset + landlock_restrict_self after PR_SET_NO_NEW_PRIVS, no capability needed); that makes landlock_get_applicable_subject() non-NULL and reaches the unpinned d_parent read.\nUI:N - The attacker's own syscalls on files and directories they own trigger the bug; no other user or administrator has to do anything.\nS:U - The corruption happens in kernel memory under the same kernel authority; exploiting it is standard local privilege escalation, not a crossing into a separate authority such as a hypervisor.\nC:H - collect_domain_accesses() dereferences the freed old_parent dentry and follows its d_parent/d_inode pointers into the Landlock inode blob via find_rule(). If the attacker reallocates the freed slab, they control pointers that the kernel then follows and reads.\nI:H - collect_domain_accesses() calls dget() and later dput() on the freed dentry. That writes the lockref inside the freed or reallocated object and can run dentry teardown on it, a write primitive that can lead to a double free or control-flow hijack.\nA:H - The KASAN report in the commit shows a slab use-after-free in collect_domain_accesses(). On production kernels the refcount changes on freed memory or the stale pointer walk can oops or panic the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/landlock/fs.c"], "versions": [{"version": "b91c3e4ea756b12b7d992529226edce1cfd854d7", "lessThan": "379efd2ce8b26fd35feb13ccc2f671ff105a5052", "status": "affected", "versionType": "git"}, {"version": "b91c3e4ea756b12b7d992529226edce1cfd854d7", "lessThan": "ba29c46ccfe3ebadfb8aa18149186c49f84b14f8", "status": "affected", "versionType": "git"}, {"version": "b91c3e4ea756b12b7d992529226edce1cfd854d7", "lessThan": "2c6dc792538260a8087ac5b22c31b3b8e47c85d6", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/landlock/fs.c"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.3-rc3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/379efd2ce8b26fd35feb13ccc2f671ff105a5052"}, {"url": "https://git.kernel.org/stable/c/ba29c46ccfe3ebadfb8aa18149186c49f84b14f8"}, {"url": "https://git.kernel.org/stable/c/2c6dc792538260a8087ac5b22c31b3b8e47c85d6"}], "title": "landlock: Fix use-after-free of the source's parent directory", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["security/landlock/fs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "379efd2ce8b26fd35feb13ccc2f671ff105a5052", "status": "affected", "version": "b91c3e4ea756b12b7d992529226edce1cfd854d7", "versionType": "git"}, {"lessThan": "ba29c46ccfe3ebadfb8aa18149186c49f84b14f8", "status": "affected", "version": "b91c3e4ea756b12b7d992529226edce1cfd854d7", "versionType": "git"}, {"lessThan": "2c6dc792538260a8087ac5b22c31b3b8e47c85d6", "status": "affected", "version": "b91c3e4ea756b12b7d992529226edce1cfd854d7", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["security/landlock/fs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.19"}, {"lessThan": "5.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc3", "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\nlandlock: Fix use-after-free of the source's parent directory\n\ncurrent_check_refer_path() reads old_dentry->d_parent without holding a\nreference nor a lock on it, and then dereferences it in\ncollect_domain_accesses() and in the audit record.\n\nA reference on a child does not pin its parent: __d_move() reassigns\ndentry->d_parent and drops the reference the child held on its former\nparent. hook_path_rename() is not affected because the rename path\ncalls lock_rename() before the hook, so the source cannot be reparented\nunder it. hook_path_link() has no such protection: filename_linkat()\nholds a reference on the source dentry but neither locks nor references\nits parent, so a concurrent rename(2) can reparent the source while\nsecurity_path_link() runs, and the former parent can then be removed and\nfreed while the hook walks it.\n\nA process can trigger this after entering a Landlock domain that handles\nat least one filesystem access right. The process can then race a\nlinkat(2) loop against rename(2) and rmdir(2):\n\n BUG: KASAN: slab-use-after-free in collect_domain_accesses+0x278/0x290\n Read of size 4 at addr ffff888160bd53f4 by task llrepro2/549\n collect_domain_accesses+0x278/0x290\n current_check_refer_path+0x952/0x1120\n security_path_link+0x1be/0x320\n filename_linkat+0x342/0x6d0\n __x64_sys_linkat+0xfa/0x150\n Freed by task 562:\n kmem_cache_free+0x139/0x4c0\n i_callback+0x4b/0x80\n rcu_core+0x7dc/0x10a0\n\nTake a reference on the dentry selected as the source parent, using\ndget() for the common-mount-root case and dget_parent() otherwise.\nRelease it after the hierarchy walk and synchronous audit logging.\n\n[mic: Clarify the caller, reachability, and reference handling]"}], "id": "CVE-2026-97594", "lastModified": "2026-09-25T15:18:00.670", "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": "2026-09-25T11:17:10.653", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c6dc792538260a8087ac5b22c31b3b8e47c85d6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/379efd2ce8b26fd35feb13ccc2f671ff105a5052"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ba29c46ccfe3ebadfb8aa18149186c49f84b14f8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{}