CVE-2026-80843

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80843", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.796Z", "datePublished": "2026-09-04T15:54:53.328Z", "dateUpdated": "2026-10-19T08:44:36.352Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:44:36.352Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix xfrm_state_construct() auth-trunc leak\n\nattach_auth_trunc() can allocate x->aalg while leaving\nx->props.aalgo at zero when the selected auth algorithm has no\nsadb_alg_id. One real case is cmac(aes).\n\nxfrm_state_construct() then treats !x->props.aalgo as \"no auth\nalgorithm attached yet\" and calls attach_auth(). That overwrites\nx->aalg and loses the first allocation. Any later failure or teardown\nonly frees the replacement pointer.\n\nCheck whether x->aalg is already attached instead of inferring that\nstate from x->props.aalgo."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_user.c"], "versions": [{"version": "4447bb33f09444920a8f1d89e1540137429351b6", "lessThan": "958ae9f261319e1cdc44879886bcda2263258cca", "status": "affected", "versionType": "git"}, {"version": "4447bb33f09444920a8f1d89e1540137429351b6", "lessThan": "fb7f3e74789a3c89647f4eb768f6dfaf4a751e72", "status": "affected", "versionType": "git"}, {"version": "4447bb33f09444920a8f1d89e1540137429351b6", "lessThan": "ba0c110c205855b3f1e3130d8c0fdb484d704c8c", "status": "affected", "versionType": "git"}, {"version": "4447bb33f09444920a8f1d89e1540137429351b6", "lessThan": "c8837bbe792257af547fd1c0252553ce13148795", "status": "affected", "versionType": "git"}, {"version": "4447bb33f09444920a8f1d89e1540137429351b6", "lessThan": "71d42da01740ec6557837bebec0bc48cfc3b4c39", "status": "affected", "versionType": "git"}, {"version": "4447bb33f09444920a8f1d89e1540137429351b6", "lessThan": "cf67361e78dca488d6e4df8396a53e6745a3a80e", "status": "affected", "versionType": "git"}, {"version": "4447bb33f09444920a8f1d89e1540137429351b6", "lessThan": "37426395cb90ef217beec8407a14bd82153793d3", "status": "affected", "versionType": "git"}, {"version": "4447bb33f09444920a8f1d89e1540137429351b6", "lessThan": "be19d20e53a239572bb2a28efcc1cd2b069b1ef9", "status": "affected", "versionType": "git"}, {"version": "4447bb33f09444920a8f1d89e1540137429351b6", "lessThan": "c12cbf56320fb633484ee0ca1fb7d68d6b64b213", "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/xfrm/xfrm_user.c"], "versions": [{"version": "2.6.33", "status": "affected"}, {"version": "0", "lessThan": "2.6.33", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.269", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.220", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.187", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.156", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.108", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.49", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.13", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.3", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "2.6.33", "versionEndExcluding": "5.10.269"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "5.15.220"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "6.1.187"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "6.6.156"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "6.12.108"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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"https://git.kernel.org/stable/c/cf67361e78dca488d6e4df8396a53e6745a3a80e"}, {"url": "https://git.kernel.org/stable/c/37426395cb90ef217beec8407a14bd82153793d3"}, {"url": "https://git.kernel.org/stable/c/be19d20e53a239572bb2a28efcc1cd2b069b1ef9"}, {"url": "https://git.kernel.org/stable/c/c12cbf56320fb633484ee0ca1fb7d68d6b64b213"}], "title": "xfrm: fix xfrm_state_construct() auth-trunc leak", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/xfrm/xfrm_user.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "958ae9f261319e1cdc44879886bcda2263258cca", "status": "affected", "version": "4447bb33f09444920a8f1d89e1540137429351b6", "versionType": "git"}, {"lessThan": "fb7f3e74789a3c89647f4eb768f6dfaf4a751e72", "status": "affected", "version": "4447bb33f09444920a8f1d89e1540137429351b6", "versionType": "git"}, {"lessThan": "ba0c110c205855b3f1e3130d8c0fdb484d704c8c", "status": "affected", "version": "4447bb33f09444920a8f1d89e1540137429351b6", "versionType": "git"}, {"lessThan": "c8837bbe792257af547fd1c0252553ce13148795", "status": "affected", "version": "4447bb33f09444920a8f1d89e1540137429351b6", "versionType": "git"}, {"lessThan": "71d42da01740ec6557837bebec0bc48cfc3b4c39", "status": "affected", "version": "4447bb33f09444920a8f1d89e1540137429351b6", "versionType": "git"}, {"lessThan": "cf67361e78dca488d6e4df8396a53e6745a3a80e", "status": "affected", "version": "4447bb33f09444920a8f1d89e1540137429351b6", "versionType": "git"}, {"lessThan": "37426395cb90ef217beec8407a14bd82153793d3", "status": "affected", "version": "4447bb33f09444920a8f1d89e1540137429351b6", "versionType": "git"}, {"lessThan": "be19d20e53a239572bb2a28efcc1cd2b069b1ef9", "status": "affected", "version": "4447bb33f09444920a8f1d89e1540137429351b6", "versionType": "git"}, {"lessThan": "c12cbf56320fb633484ee0ca1fb7d68d6b64b213", "status": "affected", "version": "4447bb33f09444920a8f1d89e1540137429351b6", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/xfrm/xfrm_user.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.33"}, {"lessThan": "2.6.33", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.269", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.220", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.187", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.156", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.108", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.49", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.13", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nxfrm: fix xfrm_state_construct() auth-trunc leak\n\nattach_auth_trunc() can allocate x->aalg while leaving\nx->props.aalgo at zero when the selected auth algorithm has no\nsadb_alg_id. One real case is cmac(aes).\n\nxfrm_state_construct() then treats !x->props.aalgo as \"no auth\nalgorithm attached yet\" and calls attach_auth(). That overwrites\nx->aalg and loses the first allocation. Any later failure or teardown\nonly frees the replacement pointer.\n\nCheck whether x->aalg is already attached instead of inferring that\nstate from x->props.aalgo."}], "id": "CVE-2026-80843", "lastModified": "2026-10-19T09:17:19.730", "metrics": {}, "published": "2026-09-04T16:18:12.877", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37426395cb90ef217beec8407a14bd82153793d3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/71d42da01740ec6557837bebec0bc48cfc3b4c39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/958ae9f261319e1cdc44879886bcda2263258cca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ba0c110c205855b3f1e3130d8c0fdb484d704c8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/be19d20e53a239572bb2a28efcc1cd2b069b1ef9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c12cbf56320fb633484ee0ca1fb7d68d6b64b213"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c8837bbe792257af547fd1c0252553ce13148795"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cf67361e78dca488d6e4df8396a53e6745a3a80e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fb7f3e74789a3c89647f4eb768f6dfaf4a751e72"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4447bb33f09444920a8f1d89e1540137429351b6,958ae9f261319e1cdc44879886bcda2263258cca)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4447bb33f09444920a8f1d89e1540137429351b6,fb7f3e74789a3c89647f4eb768f6dfaf4a751e72)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4447bb33f09444920a8f1d89e1540137429351b6,ba0c110c205855b3f1e3130d8c0fdb484d704c8c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4447bb33f09444920a8f1d89e1540137429351b6,c8837bbe792257af547fd1c0252553ce13148795)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4447bb33f09444920a8f1d89e1540137429351b6,71d42da01740ec6557837bebec0bc48cfc3b4c39)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4447bb33f09444920a8f1d89e1540137429351b6,cf67361e78dca488d6e4df8396a53e6745a3a80e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4447bb33f09444920a8f1d89e1540137429351b6,37426395cb90ef217beec8407a14bd82153793d3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4447bb33f09444920a8f1d89e1540137429351b6,be19d20e53a239572bb2a28efcc1cd2b069b1ef9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4447bb33f09444920a8f1d89e1540137429351b6,c12cbf56320fb633484d704c8c)"}}], "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": "2.6.33"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.33)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.269,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.220,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.187,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.156,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.108,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.49,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.13,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.3,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "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": "2026-09-04T18:45:03.011873+00:00", "updated": "2026-09-05T06:00:11.221281+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362"]}