{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80980", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.811Z", "datePublished": "2026-09-11T19:42:40.832Z", "dateUpdated": "2026-09-13T06:28:46.582Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-13T06:28:46.582Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: stop killed, freed and out_of_sync sharing a byte\n\nThe three connection state flags are single-bit bitfields, so they occupy\none byte of struct smc_connection and every store to one is a\nread-modify-write of the other two:\n\n u8 killed : 1;\n u8 freed : 1;\n u8 out_of_sync : 1;\n\nThey are not written under a common lock. smc_cdc_msg_validate() sets\nout_of_sync from the receive tasklet, while smc_conn_kill() sets killed\nfrom process context under lock_sock(), and the receive path does not defer\nto the backlog when the socket is owned -- smc_cdc_msg_recv() takes only\nbh_lock_sock().\n\nGive each flag its own byte so a store no longer touches its neighbours.\nAll readers test them as booleans and are unchanged. struct smc_connection\ngrows by two bytes."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - smc_cdc_msg_validate() runs from the SMC-R CDC receive tasklet on RDMA completions, and teardown is driven by CLC DECLINE (FIRST_CONTACT) or LLC DELETE_LINK_ALL from the same peer. SMC-Rv2 is RoCEv2 over UDP/4791 (IP-routable) with the CLC handshake on plain TCP, so a remote host that can reach an AF_SMC listener hits the path.\nAC:L - The attacker controls both sides of the race: it sends CDC failover_validation messages that store out_of_sync from the receive tasklet (no sock lock) while concurrently forcing smc_conn_kill()/smc_conn_free() via CLC decline, CDC close/abort, or LLC link-delete, and can retry across many connections in the same link group.\nPR:N - SMC has no peer authentication. Completing the CLC handshake to a listening AF_SMC/IPPROTO_SMC socket and sending CDC/CLC/LLC messages requires no credentials, capabilities, or local account, matching other SMC remote bugs.\nUI:N - CDC is processed in a softirq tasklet from the RDMA completion queue and CLC decline is handled in the handshake worker; no local user or application action is required beyond the already-listening SMC server.\nS:U - The corrupted flags and resulting UAF stay inside kernel objects (smc_connection, smc_sock, smc_link_group) in the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A lost killed/freed/out_of_sync bit from the shared-byte RMW lets CDC continue after unregister or lets smc_conn_free() run twice (duplicate smc_lgr_put), a use-after-free of the socket and link group that can be reallocated to disclose kernel memory.\nI:H - The same UAF/double-free writes through a reused smc_sock (sk_err, sk_data_ready, queue_work on abort_work/close_work) and link-group refcounts, giving heap-spray primitives for arbitrary kernel write and control-flow hijack.\nA:H - Use-after-free and double-free of the connection and link group oops or panic in softirq/workqueue context (refcount underflow, as in related SMC UAFs), and the attacker can trigger it repeatedly without authentication."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/smc.h"], "versions": [{"version": "b286a0651e4404ab96cdfdcdad8a839a26b3751e", "lessThan": "313f79149eb337411c64e2c247234b62ef9a3cb9", "status": "affected", "versionType": "git"}, {"version": "b286a0651e4404ab96cdfdcdad8a839a26b3751e", "lessThan": "2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec", "status": "affected", "versionType": "git"}, {"version": "b286a0651e4404ab96cdfdcdad8a839a26b3751e", "lessThan": "db51a8658c11a82432b64999519a269c3aabb447", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/smc.h"], "versions": [{"version": "5.8", "status": "affected"}, {"version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "5.8", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9"}, {"url": "https://git.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec"}, {"url": "https://git.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447"}], "title": "net/smc: stop killed, freed and out_of_sync sharing a byte", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/smc/smc.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "313f79149eb337411c64e2c247234b62ef9a3cb9", "status": "affected", "version": "b286a0651e4404ab96cdfdcdad8a839a26b3751e", "versionType": "git"}, {"lessThan": "2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec", "status": "affected", "version": "b286a0651e4404ab96cdfdcdad8a839a26b3751e", "versionType": "git"}, {"lessThan": "db51a8658c11a82432b64999519a269c3aabb447", "status": "affected", "version": "b286a0651e4404ab96cdfdcdad8a839a26b3751e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/smc/smc.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.8"}, {"lessThan": "5.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "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\nnet/smc: stop killed, freed and out_of_sync sharing a byte\n\nThe three connection state flags are single-bit bitfields, so they occupy\none byte of struct smc_connection and every store to one is a\nread-modify-write of the other two:\n\n u8 killed : 1;\n u8 freed : 1;\n u8 out_of_sync : 1;\n\nThey are not written under a common lock. smc_cdc_msg_validate() sets\nout_of_sync from the receive tasklet, while smc_conn_kill() sets killed\nfrom process context under lock_sock(), and the receive path does not defer\nto the backlog when the socket is owned -- smc_cdc_msg_recv() takes only\nbh_lock_sock().\n\nGive each flag its own byte so a store no longer touches its neighbours.\nAll readers test them as booleans and are unchanged. struct smc_connection\ngrows by two bytes."}], "id": "CVE-2026-80980", "lastModified": "2026-09-13T07:17:04.887", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:04.407", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: SMC concurrency flaw in connection state flags", "id": "2532124", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532124"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-366", "details": ["A flaw was found in the Linux kernel's SMC (Server Message Block over Remote Direct Memory Access) protocol implementation. A concurrency issue exists where three connection state flags (killed, freed, and out_of_sync) share a single byte in the `smc_connection` structure without proper locking mechanisms. This allows for a read-modify-write race condition when different functions attempt to modify these flags simultaneously. This could lead to incorrect connection state management, potentially causing unexpected behavior or a denial of service."], "name": "CVE-2026-80980", "public_date": "2026-09-11T19:42:40Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80980\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80980\nhttps://git.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec\nhttps://git.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9\nhttps://git.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b286a0651e4404ab96cdfdcdad8a839a26b3751e,313f79149eb337411c64e2c247234b62ef9a3cb9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b286a0651e4404ab96cdfdcdad8a839a26b3751e,2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b286a0651e4404ab96cdfdcdad8a839a26b3751e,db51a8658c11a82432b64999519a269c3aabb447)"}}], "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": "5.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-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": "2026-09-12T02:30:06.165668+00:00", "updated": "2026-09-12T03:15:06.513827+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}