{ "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-2026-93203", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-93203", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-17T16:12:23.742Z", "updatedAt": "2026-10-19T09:07:15.551Z", "importedAt": "2026-10-24T01:58:35.090Z", "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": "batman-adv: bla: avoid CRC corruption due to parallel claim add", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: avoid CRC corruption due to parallel claim add\n\nbatadv_bla_add_claim() is used to add claims and modify the backbone of\nclaims for CLAIM frames from remote backbones and local packets. When it\nhandles a claim, it needs to either\n\n* add the new claim's CRC to the backbone CRC\n* remove the already existing claim's CRC from the old backbone and add it\n to the new backbone\n\nBut when the \"new\" claim code was running in parallel to the \"change\nbackbone\" code, it can happen that the CRC was invalid because the\nbackbone_gw of the claim was changed twice in the \"new\" claim code path:\n\n* CPU0 creates the claim for gateway A and publishes it in the claim\n hash. The crc16 of the address has not yet been added to A's crc at\n this point.\n\n* CPU1 processes a claim frame of gateway B for the same client, finds\n the just published claim, and performs the ownership change: it\n switches the pointer to B, removes the crc16 from A's crc - which\n never contained it - and adds it to B's crc.\n\n* CPU0 continues behind the creation branch, unconditionally switches\n the pointer back to A without compensating B's crc (its remove_crc\n is false for the creation path), and finally adds the crc16 to A's\n crc\n\nThe CRC is then wrong for both:\n\n* claim belongs to A: but CRC is not part of backbone A's CRC\n* claim doesn't belong to B: CRC is still part of backbone B's CRC\n\nThis wrong CRC is never recomputated from the stored claims. For local\nbackbone claims, this can also not recovered using syncs.\n\nTo avoid this, split the functionality in clear separate parts:\n\n* new claim which always adds claim CRC to the backbone CRC (but never\n changes the already set backbone_gw of the claim back)\n\n* update of existing claim which automatically changes the backbone_gw\n entry and only updates both backbone CRCs when there was an actual change", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "status": "affected", "versionType": "git", "lessThan": "3d4a9ae2c69c0fe4c3c69587288241243bb7a39b" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "status": "affected", "versionType": "git", "lessThan": "ad982d925f00d860d2467811256ffadcccd9e4a7" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "status": "affected", "versionType": "git", "lessThan": "d5b0e7574da5a485f4dbec32a15911900a4487c2" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "status": "affected", "versionType": "git", "lessThan": "a3e07db74f22a85aeeb51c600da5c98b9cbca11f" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "status": "affected", "versionType": "git", "lessThan": "1d390db003cbb52cdd86837608bff3794501a5ea" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "status": "affected", "versionType": "git", "lessThan": "8bcfa58c4277bff1882a23547c37ab08aa1de12f" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "status": "affected", "versionType": "git", "lessThan": "e54602d9e38db8573f2097d60c7ea8be0a5af1fa" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "status": "affected", "versionType": "git", "lessThan": "08645ab95768b88e2ff85a89211994651710465b" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.5", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.5" }, { "version": "5.10.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.221", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.188", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.157", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.110", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.52", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }