CVE-2026-64009

{"id": "CVE-2026-64009", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64009", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:35:15.345325Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c5c2523893747f88a83376abad310c8ad13f7197", "lessThan": "8014f70c4e6e5ab101ae3860a614e65e988372e3", "versionType": "git"}, {"status": "affected", "version": "c5c2523893747f88a83376abad310c8ad13f7197", "lessThan": "1021d2877b689a648b27815c854557a917122e93", "versionType": "git"}, {"status": "affected", "version": "c5c2523893747f88a83376abad310c8ad13f7197", "lessThan": "2a41b1b31c61c52b972278ce1732a1443f5e89ed", "versionType": "git"}, {"status": "affected", "version": "c5c2523893747f88a83376abad310c8ad13f7197", "lessThan": "fccd685b32df5aaf6bad4381eeda216468e283f0", "versionType": "git"}, {"status": "affected", "version": "c5c2523893747f88a83376abad310c8ad13f7197", "lessThan": "820e501be8aee4b365d218d83227b314309c5fda", "versionType": "git"}, {"status": "affected", "version": "c5c2523893747f88a83376abad310c8ad13f7197", "lessThan": "82ac903e0b519849647657b8c48d21237ada06a2", "versionType": "git"}, {"status": "affected", "version": "c5c2523893747f88a83376abad310c8ad13f7197", "lessThan": "3db50ceeacb52806d8fe86fb1dfe944df0b9f789", "versionType": "git"}, {"status": "affected", "version": "c5c2523893747f88a83376abad310c8ad13f7197", "lessThan": "742b04d0550b0ec89dcbc99537ec88653bd1ad90", "versionType": "git"}], "programFiles": ["net/xfrm/xfrm_state.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.22"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.22", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.93", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.35", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.12", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/xfrm/xfrm_state.c"], "defaultStatus": "affected"}]}], "published": "2026-07-19T16:17:40.663", "references": [{"url": "https://git.kernel.org/stable/c/1021d2877b689a648b27815c854557a917122e93", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/2a41b1b31c61c52b972278ce1732a1443f5e89ed", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3db50ceeacb52806d8fe86fb1dfe944df0b9f789", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/742b04d0550b0ec89dcbc99537ec88653bd1ad90", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8014f70c4e6e5ab101ae3860a614e65e988372e3", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/820e501be8aee4b365d218d83227b314309c5fda", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/82ac903e0b519849647657b8c48d21237ada06a2", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fccd685b32df5aaf6bad4381eeda216468e283f0", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-787"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-191"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Check for underflow in xfrm_state_mtu\n\nLeo Lin reported OOB write issue in esp component:\n\n xfrm_state_mtu() returns u32 but performs its arithmetic in unsigned\n modulo-2^32 space using an attacker-influenced \"header_len + authsize +\n net_adj\" subtracted from a small \"mtu\" argument. A nobody user can\n install an IPv4 ESP tunnel SA with a large authentication key\n (XFRMA_ALG_AUTH_TRUNC, e.g. hmac(sha512), 64-byte key, 64-byte trunc),\n configure a small interface MTU (68 bytes), and set XFRMA_TFCPAD to a\n large value. When a single UDP datagram is then sent through the\n tunnel, xfrm_state_mtu() underflows to a near-2^32 value, and\n esp_output() consumes it as a signed int via:\n\n padto = min(x->tfcpad, xfrm_state_mtu(x, mtu_cached))\n esp.tfclen = padto - skb->len (assigned to int)\n\n esp.tfclen ends up negative (e.g. -207). It is sign-extended to size_t\n when passed to memset() inside esp_output_fill_trailer(), producing a\n ~16 EB write of zeroes at skb_tail_pointer(skb). KASAN logs it as\n \"Write of size 18446744073709551537 at addr ffff888...\".\n\nCheck for underflow and return 1. This causes the sendmsg attempt to\nfail with ENETUNREACH."}], "lastModified": "2026-10-19T21:17:18.950", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D88CE404-F14A-49F7-862B-23D7205FD4C4", "versionEndExcluding": "5.10.259", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5E938CDF-D1C4-43D0-98DC-9E11B6B55801", "versionEndExcluding": "5.15.210", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C4446623-5F2B-4DD8-8666-9FAAC285A757", "versionEndExcluding": "6.1.176", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C", "versionEndExcluding": "6.6.143", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1E73413E-0629-41AA-A4D3-5A3D10A0BD63", "versionEndExcluding": "6.12.93", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0FCCB23A-7629-4386-93B6-B119237C4382", "versionEndExcluding": "6.18.35", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9161A938-0FA8-44BC-95FE-C5A271601AB3", "versionEndExcluding": "7.0.12", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}