{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-52914", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.367Z", "datePublished": "2026-06-24T07:14:11.906Z", "dateUpdated": "2026-08-05T12:31:36.920Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:36.920Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix fragment reassembly length accounting\n\nbatman-adv keeps a running payload length for queued fragments and uses it\nto validate a fragment chain before reassembly.\n\nThat accounting currently allows the accumulated fragment length to be\ntruncated during updates. As a result, malformed fragment chains can\nbypass the intended validation and drive reassembly with inconsistent\nlength state, leading to a local denial of service.\n\nFix the accounting by storing the accumulated length in a length-typed\nfield and rejecting update overflows before the existing validation logic\nruns.\n\nThe fix was verified against the original reproducer and against valid\nfragment reassembly paths." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable path is reached by received ETH_P_BATMAN BATADV_UNICAST_FRAG network frames through batadv_batman_skb_recv(). A remote BATMAN-adv mesh peer can deliver crafted fragments to the target node without using a local syscall or device file.\nAC:L - The attacker controls the fragment sequence number, fragment number, total_size field, and payload lengths needed to trigger the wrapped accounting. In a reasonable high-MTU BATMAN-adv deployment, no race or victim-specific state beyond an active mesh interface is required.\nPR:N - The receive path performs packet-format, destination-MAC, mesh-state, and originator lookups, but no authentication or privilege check on the sender. An attacker sending accepted BATMAN-adv frames needs no privileges on the target.\nUI:N - Exploitation is triggered solely by delivery of crafted BATMAN-adv fragments to an active interface. No victim user action is required.\nS:U - The vulnerability corrupts or crashes the kernel handling the same BATMAN-adv/networking security authority. It does not cross a separate boundary such as guest-to-host or IOMMU isolation.\nC:H - The truncated length state can drive reassembly with inconsistent sizing and attacker-controlled fragment data, creating plausible kernel memory corruption. Under the overestimate rule, such corruption can be leveraged for kernel memory disclosure.\nI:H - The reassembly path can size the output skb from the wrapped total while copying more attacker-controlled fragment data than accounted. This is defensibly an out-of-bounds write/kernel memory corruption condition.\nA:H - At minimum, the malformed chain can hit skb tail overrun BUG/panic behavior or otherwise corrupt kernel memory. That gives a reliable kernel crash/denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/fragmentation.c", "net/batman-adv/types.h" ], "versions": [ { "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605", "lessThan": "e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64", "status": "affected", "versionType": "git" }, { "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605", "lessThan": "37be61825b15534a16ff9cfc9546de155b6df982", "status": "affected", "versionType": "git" }, { "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605", "lessThan": "975563c5de1123dde1ec7946bf5556d20c89d74e", "status": "affected", "versionType": "git" }, { "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605", "lessThan": "f653b040dad1af70fa5cd4fe085e4758925480c9", "status": "affected", "versionType": "git" }, { "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605", "lessThan": "e910dbf509125fe51ad68e4fa74dc8ab0a8e787a", "status": "affected", "versionType": "git" }, { "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605", "lessThan": "3eb8bcb823391bd58997831b3c9c152a4ba8e255", "status": "affected", "versionType": "git" }, { "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605", "lessThan": "fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0", "status": "affected", "versionType": "git" }, { "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605", "lessThan": "9cd3f16c320bfdadd4509358122368deb56a5741", "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/batman-adv/fragmentation.c", "net/batman-adv/types.h" ], "versions": [ { "version": "3.13", "status": "affected" }, { "version": "0", "lessThan": "3.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.142", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "3.13", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.6.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.12.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64" }, { "url": "https://git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de155b6df982" }, { "url": "https://git.kernel.org/stable/c/975563c5de1123dde1ec7946bf5556d20c89d74e" }, { "url": "https://git.kernel.org/stable/c/f653b040dad1af70fa5cd4fe085e4758925480c9" }, { "url": "https://git.kernel.org/stable/c/e910dbf509125fe51ad68e4fa74dc8ab0a8e787a" }, { "url": "https://git.kernel.org/stable/c/3eb8bcb823391bd58997831b3c9c152a4ba8e255" }, { "url": "https://git.kernel.org/stable/c/fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0" }, { "url": "https://git.kernel.org/stable/c/9cd3f16c320bfdadd4509358122368deb56a5741" } ], "title": "batman-adv: fix fragment reassembly length accounting", "x_generator": { "engine": "bippy-1.2.0" } } } }