CVE-2026-31515

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len:392 put:16 head:ffff88802a4ad040 data:ffff88802a4ad040 tail:0x188 end:0x180 dev:<NULL>\n kernel BUG at net/core/skbuff.c:214 !\nCall Trace:\n <TASK>\n skb_over_panic net/core/skbuff.c:219 [inline]\n skb_put+0x159/0x210 net/core/skbuff.c:2655\n skb_put_zero include/linux/skbuff.h:2788 [inline]\n set_ipsecrequest net/key/af_key.c:3532 [inline]\n pfkey_send_migrate+0x1270/0x2e50 net/key/af_key.c:3636\n km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2848\n xfrm_migrate+0x2140/0x2450 net/xfrm/xfrm_policy.c:4705\n xfrm_do_migrate+0x8ff/0xaa0 net/xfrm/xfrm_user.c:3150"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/key/af_key.c"], "versions": [{"version": "08de61beab8a21c8e0b3906a97defda5f1f66ece", "lessThan": "d0c5aa8dd38887714f1aad04236a3620b56a5e4e", "status": "affected", "versionType": "git"}, {"version": "08de61beab8a21c8e0b3906a97defda5f1f66ece", 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"6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "2.6.21", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.6.131"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": 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"affected"}], "references": [{"url": "https://git.kernel.org/stable/c/d0c5aa8dd38887714f1aad04236a3620b56a5e4e"}, {"url": "https://git.kernel.org/stable/c/e06b596fc4eb01936a2e5dccad17c946d660bab8"}, {"url": "https://git.kernel.org/stable/c/8ddf8de7e758f6888988467af9ffc8adf589fb16"}, {"url": "https://git.kernel.org/stable/c/d3225e6b9bd51ec177970a628fe4b11237ce87d5"}, {"url": "https://git.kernel.org/stable/c/7b18692c59afb8e5c364c8e3ac01e51dd6b52028"}, {"url": "https://git.kernel.org/stable/c/83f644ea92987c100b82d8481ae2230faeed3d34"}, {"url": "https://git.kernel.org/stable/c/ee836e820a40e2ca4da8af7310bff92d586772d4"}, {"url": "https://git.kernel.org/stable/c/eb2d16a7d599dc9d4df391b5e660df9949963786"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_key: validate families in pfkey_send_migrate()\n\nsyzbot was able to trigger a crash in skb_put() [1]\n\nIssue is that pfkey_send_migrate() does not check old/new families,\nand that set_ipsecrequest() @family argument was truncated,\nthus possibly overfilling the skb.\n\nValidate families early, do not wait set_ipsecrequest().\n\n[1]\n\nskbuff: skb_over_panic: text:ffffffff8a752120 len:392 put:16 head:ffff88802a4ad040 data:ffff88802a4ad040 tail:0x188 end:0x180 dev:<NULL>\n kernel BUG at net/core/skbuff.c:214 !\nCall Trace:\n <TASK>\n skb_over_panic net/core/skbuff.c:219 [inline]\n skb_put+0x159/0x210 net/core/skbuff.c:2655\n skb_put_zero include/linux/skbuff.h:2788 [inline]\n set_ipsecrequest net/key/af_key.c:3532 [inline]\n pfkey_send_migrate+0x1270/0x2e50 net/key/af_key.c:3636\n km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2848\n xfrm_migrate+0x2140/0x2450 net/xfrm/xfrm_policy.c:4705\n xfrm_do_migrate+0x8ff/0xaa0 net/xfrm/xfrm_user.c:3150"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, 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"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "2.6.21"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:10:17.324Z"}}}, "cveMetadata": {"cveId": "CVE-2026-31515", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:44:48.251Z", "dateReserved": "2026-03-09T15:48:24.107Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-04-22T13:54:32.194Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": 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vulnerability has been resolved:\n\naf_key: validate families in pfkey_send_migrate()\n\nsyzbot was able to trigger a crash in skb_put() [1]\n\nIssue is that pfkey_send_migrate() does not check old/new families,\nand that set_ipsecrequest() @family argument was truncated,\nthus possibly overfilling the skb.\n\nValidate families early, do not wait set_ipsecrequest().\n\n[1]\n\nskbuff: skb_over_panic: text:ffffffff8a752120 len:392 put:16 head:ffff88802a4ad040 data:ffff88802a4ad040 tail:0x188 end:0x180 dev:<NULL>\n kernel BUG at net/core/skbuff.c:214 !\nCall Trace:\n <TASK>\n skb_over_panic net/core/skbuff.c:219 [inline]\n skb_put+0x159/0x210 net/core/skbuff.c:2655\n skb_put_zero include/linux/skbuff.h:2788 [inline]\n set_ipsecrequest net/key/af_key.c:3532 [inline]\n pfkey_send_migrate+0x1270/0x2e50 net/key/af_key.c:3636\n km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2848\n xfrm_migrate+0x2140/0x2450 net/xfrm/xfrm_policy.c:4705\n xfrm_do_migrate+0x8ff/0xaa0 net/xfrm/xfrm_user.c:3150"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\naf_key: validar familias en pfkey_send_migrate()\n\nsyzbot pudo provocar un fallo en skb_put() [1]\n\nEl problema es que pfkey_send_migrate() no comprueba las familias antiguas/nuevas,\ny que el argumento @family de set_ipsecrequest() fue truncado,\nlo que posiblemente desbordaba el skb.\n\nValidar las familias pronto, no esperar a set_ipsecrequest().\n\n[1]\n\nskbuff: skb_over_panic: texto:ffffffff8a752120 longitud:392 puesto:16 cabecera:ffff88802a4ad040 datos:ffff88802a4ad040 cola:0x188 fin:0x180 dispositivo:[NULL]\nERROR del kernel en net/core/skbuff.c:214 !\nTraza de la llamada:\n[TASK]\n skb_over_panic net/core/skbuff.c:219 [inline]\n skb_put+0x159/0x210 net/core/skbuff.c:2655\n skb_put_zero include/linux/skbuff.h:2788 [inline]\n set_ipsecrequest net/key/af_key.c:3532 [inline]\n pfkey_send_migrate+0x 1270/0x 2e50 net/key/af_key.c:3636\n km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2848\n xfrm_migrate+0x 2140/0x 2450 net/xfrm/xfrm_policy.c:4705\n xfrm_do_migrate+0x8ff/0xaa0 net/xfrm/xfrm_user.c:3150"}], "id": "CVE-2026-31515", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31515", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:36:29.210869Z", "version": "2.0.3"}}]}, 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"416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eb2d16a7d599dc9d4df391b5e660df9949963786"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ee836e820a40e2ca4da8af7310bff92d586772d4"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: af_key: validate families in pfkey_send_migrate()", "id": "2460723", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460723"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-131", "details": ["A flaw was found in the Linux kernel. The `pfkey_send_migrate` function, which manages security associations, does not properly validate address families. This oversight can lead to an overfill of the socket buffer (skb), a data structure used for network packets, when processing certain requests. A local user could exploit this vulnerability to trigger a kernel crash, resulting in a Denial of Service (DoS) for the affected system."], "name": "CVE-2026-31515", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31515\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31515\nhttps://lore.kernel.org/linux-cve-announce/2026042210-CVE-2026-31515-d929@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08de61beab8a21c8e0b3906a97defda5f1f66ece,d0c5aa8dd38887714f1aad04236a3620b56a5e4e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08de61beab8a21c8e0b3906a97defda5f1f66ece,e06b596fc4eb01936a2e5dccad17c946d660bab8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08de61beab8a21c8e0b3906a97defda5f1f66ece,8ddf8de7e758f6888988467af9ffc8adf589fb16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08de61beab8a21c8e0b3906a97defda5f1f66ece,d3225e6b9bd51ec177970a628fe4b11237ce87d5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08de61beab8a21c8e0b3906a97defda5f1f66ece,7b18692c59afb8e5c364c8e3ac01e51dd6b52028)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08de61beab8a21c8e0b3906a97defda5f1f66ece,83f644ea92987c100b82d8481ae2230faeed3d34)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08de61beab8a21c8e0b3906a97defda5f1f66ece,ee836e820a40e2ca4da8af7310bff92d586772d4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08de61beab8a21c8e0b3906a97defda5f1f66ece,eb2d16a7d599dc9d4df391b5e660df9949963786)"}}], "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": "2.6.21"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,2.6.21)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.253,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.203,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.131,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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"}], "analysis": {"en": {"generated_at": "2026-04-28T20:46:21.965789+00:00", "value": {"mitigation_remediation": ["Upgrade the Linux kernel to a version that includes the af_key family validation fix", "Restrict access to PF_KEY sockets to trusted or privileged users only", "Apply any available vendor backport or security patch for the kernel in the meantime, or temporarily disable IPsec/PF_KEY features that could trigger the bug until a patch is released"], "summary": {"action": "Patch Immediately", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "All Linux kernel releases before the commit that adds early family validation to af_key are affected. The kernel change is part of upstream development and applies to mainstream distributions that ship the original kernel code.", "description_and_impact": "A missing check for family values in the Linux kernel\u2019s pfkey_send_migrate() routine allows truncated arguments to over\u2011fill a socket buffer. The resulting buffer overflow triggers a BUG in skb_put(), causing a kernel panic. This crash leads to a complete system shutdown, but does not provide a path to escape privilege limits.", "risk_and_exploitability": "The CVSS score of 5.5 indicates medium severity while the EPSS score of less than 1% points to a low probability of exploitation. Local users who can send crafted PF_KEY requests\u2014such as administrators manipulating IPsec configurations\u2014can trigger the crash. The attack does not have a wide spread exploitation presence and is not listed in CISA KEV, but the denial of service impact mandates prompt patching."}}}}, "created": "2026-04-22T21:15:27.401489+00:00", "updated": "2026-04-28T21:00:14.735089+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}