{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-80731", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80731", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-03T08:21:48.924Z", "updatedAt": "2026-10-16T19:26:36.020Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove CAP_SYS_RAWIO zero-padding in dev_validate_header\n\ndev_validate_header() reads dev->hard_header_len directly when\nzero-padding short link layer headers for CAP_SYS_RAWIO holders:\n\n if (capable(CAP_SYS_RAWIO)) {\n memset(ll_header + len, 0, dev->hard_header_len - len);\n return true;\n }\n\nPacket send paths call dev_validate_header() on skbs whose headroom was\nallocated from an earlier hard_header_len read. If the device is\nreconfigured so that dev->hard_header_len increases before validation,\nthe memset writes past the reserved buffer, an out-of-bounds write.\n\nThis out-of-bounds write is masked in some SOCK_RAW paths today because\nthe same concurrent increase can first make skb_push() exceed the\nreserved headroom and trigger skb_under_panic(). Remove the zero-padding\nbranch before making those hard_header_len reads consistent, so the\nsnapshot fixes do not turn a loud panic into a silent overwrite.\n\nThis path is only reached for variable length L2 protocols, where\nlen < hard_header_len but len >= min_header_len. No remaining in-tree\nvariable length L2 protocol implements header_ops->validate, and the\nCAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no\nreal value beyond allowing testing of intentionally malformed input.\n\nDrop the CAP_SYS_RAWIO branch. The remaining reads of\ndev->hard_header_len in dev_validate_header() are comparisons only and\nhave no memory safety impact.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "b5518429e70cd783b8ca52335456172c1a0589f6", "status": "affected", "versionType": "git", "lessThan": "53fd7f912c0877647d6a1e1877f5ea8535ee0b4a" }, { "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace", "status": "affected", "versionType": "git", "lessThan": "fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6" }, { "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace", "status": "affected", "versionType": "git", "lessThan": "8fc9816404166a90ed8d544dc52482fafffb6d9f" }, { "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace", "status": "affected", "versionType": "git", "lessThan": "b0f92a5731dc82556a9ae005cc35f71ab136307b" }, { "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace", "status": "affected", "versionType": "git", "lessThan": "99df6b7a713f96eda206680d100b76e15f9d9b69" }, { "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace", "status": "affected", "versionType": "git", "lessThan": "74e035f07f53feca09e2352e77fccb09cad5e208" }, { "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace", "status": "affected", "versionType": "git", "lessThan": "dbb30dc943a93e083f1e531bfdc6779e57de40d0" }, { "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace", "status": "affected", "versionType": "git", "lessThan": "fc902f52a02298c7432b2334c0c82a2885a1a8b6" }, { "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace", "status": "affected", "versionType": "git", "lessThan": "3b9a324e646d3657a8d9806dfbfe4f3e4066e882" }, { "version": "f58a6c08ebdfa978178bbca78c2ba744a2665912", "status": "affected", "versionType": "git" }, { "version": "1df16498dfd0d5a129bdf2982d9a08df73e8923d", "status": "affected", "versionType": "git" }, { "version": "8b8d278aa4de9335682bbd4a3bb619af015c859e", "status": "affected", "versionType": "git" }, { "version": "6804052fa9d86e9a512c88b24a5debbfc1a490fc", "status": "affected", "versionType": "git" }, { "version": "3.2.80", "status": "affected", "versionType": "semver", "lessThan": "3.2.81" }, { "version": "3.16.36", "status": "affected", "versionType": "semver", "lessThan": "3.17" }, { "version": "4.1.28", "status": "affected", "versionType": "semver", "lessThan": "4.2" }, { "version": "4.4.8", "status": "affected", "versionType": "semver", "lessThan": "4.5" }, { "version": "4.5.2", "status": "affected", "versionType": "semver", "lessThan": "4.6" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.6", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.6" }, { "version": "3.2.81", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "3.2.*" }, { "version": "5.10.265", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.216", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.183", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.152", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.104", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.45", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.9", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }