CVE-2026-80839

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80839", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.796Z", "datePublished": "2026-09-04T15:54:49.378Z", "dateUpdated": "2026-10-19T08:44:32.478Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:44:32.478Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: reject unrepresentable multicast TVLV offsets\n\nThe network and transport header fields in struct sk_buff are 16-bit\noffsets from skb->head, and U16_MAX is reserved as the unset transport\nheader value. batadv_tvlv_call_handler() sets both fields from a received\nmulticast TVLV without checking whether the TVLV end is representable.\n\nIf the end offset exceeds the field's range, skb_set_transport_header()\ntruncates it so that the transport header precedes the network header.\nThe negative difference is then returned by skb_network_header_len() as\na large u32. batadv_mcast_forw_packet() consequently accepts an oversized\nmulticast tracker and accesses memory beyond the skb data.\n\nAdd skb_set_transport_header_careful(), an offset-aware counterpart to\nskb_reset_transport_header_careful(), which validates the final\nhead-relative offset before assigning it. Use the new helper in\nbatadv_tvlv_call_handler() and reject unrepresentable TVLVs before\nsetting the network header."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/skbuff.h", "net/batman-adv/tvlv.c"], "versions": [{"version": "07afe1ba288c04280622fa002ed385f1ac0b6fe6", "lessThan": "da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2", "status": "affected", "versionType": "git"}, {"version": "07afe1ba288c04280622fa002ed385f1ac0b6fe6", "lessThan": "916ec741e65af072b98e475feaad98c063da1b7c", "status": "affected", "versionType": "git"}, {"version": "07afe1ba288c04280622fa002ed385f1ac0b6fe6", "lessThan": "1b466746fe109127fd983100a228cdd1f1f6ece2", "status": "affected", "versionType": "git"}, {"version": "07afe1ba288c04280622fa002ed385f1ac0b6fe6", "lessThan": "2b46baa591d0a7c16b62f150917187e70d053be6", "status": "affected", "versionType": "git"}, {"version": "07afe1ba288c04280622fa002ed385f1ac0b6fe6", "lessThan": "f12c2de4f542e3220e17e0606f492110064f04cb", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/skbuff.h", "net/batman-adv/tvlv.c"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.108", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.49", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.13", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.3", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.8", "versionEndExcluding": "6.12.108"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.49"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.1.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2"}, {"url": "https://git.kernel.org/stable/c/916ec741e65af072b98e475feaad98c063da1b7c"}, {"url": "https://git.kernel.org/stable/c/1b466746fe109127fd983100a228cdd1f1f6ece2"}, {"url": "https://git.kernel.org/stable/c/2b46baa591d0a7c16b62f150917187e70d053be6"}, {"url": "https://git.kernel.org/stable/c/f12c2de4f542e3220e17e0606f492110064f04cb"}], "title": "batman-adv: reject unrepresentable multicast TVLV offsets", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/skbuff.h", "net/batman-adv/tvlv.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2", "status": "affected", "version": "07afe1ba288c04280622fa002ed385f1ac0b6fe6", "versionType": "git"}, {"lessThan": "916ec741e65af072b98e475feaad98c063da1b7c", "status": "affected", "version": "07afe1ba288c04280622fa002ed385f1ac0b6fe6", "versionType": "git"}, {"lessThan": "1b466746fe109127fd983100a228cdd1f1f6ece2", "status": "affected", "version": "07afe1ba288c04280622fa002ed385f1ac0b6fe6", "versionType": "git"}, {"lessThan": "2b46baa591d0a7c16b62f150917187e70d053be6", "status": "affected", "version": "07afe1ba288c04280622fa002ed385f1ac0b6fe6", "versionType": "git"}, {"lessThan": "f12c2de4f542e3220e17e0606f492110064f04cb", "status": "affected", "version": "07afe1ba288c04280622fa002ed385f1ac0b6fe6", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/skbuff.h", "net/batman-adv/tvlv.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"lessThan": "6.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.108", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.49", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.13", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: reject unrepresentable multicast TVLV offsets\n\nThe network and transport header fields in struct sk_buff are 16-bit\noffsets from skb->head, and U16_MAX is reserved as the unset transport\nheader value. batadv_tvlv_call_handler() sets both fields from a received\nmulticast TVLV without checking whether the TVLV end is representable.\n\nIf the end offset exceeds the field's range, skb_set_transport_header()\ntruncates it so that the transport header precedes the network header.\nThe negative difference is then returned by skb_network_header_len() as\na large u32. batadv_mcast_forw_packet() consequently accepts an oversized\nmulticast tracker and accesses memory beyond the skb data.\n\nAdd skb_set_transport_header_careful(), an offset-aware counterpart to\nskb_reset_transport_header_careful(), which validates the final\nhead-relative offset before assigning it. Use the new helper in\nbatadv_tvlv_call_handler() and reject unrepresentable TVLVs before\nsetting the network header."}], "id": "CVE-2026-80839", "lastModified": "2026-10-19T09:17:19.223", "metrics": {}, "published": "2026-09-04T16:18:12.310", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1b466746fe109127fd983100a228cdd1f1f6ece2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2b46baa591d0a7c16b62f150917187e70d053be6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/916ec741e65af072b98e475feaad98c063da1b7c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f12c2de4f542e3220e17e0606f492110064f04cb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[07afe1ba288c04280622fa002ed385f1ac0b6fe6,da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[07afe1ba288c04280622fa002ed385f1ac0b6fe6,916ec741e65af072b98e475feaad98c063da1b7c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[07afe1ba288c04280622fa002ed385f1ac0b6fe6,1b466746fe109127fd983100a228cdd1f1f6ece2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[07afe1ba288c04280622fa002ed385f1ac0b6fe6,2b46baa591d0a7c16b62f150917187e70d053be6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[07afe1ba288c04280622fa002ed385f1ac0b6fe6,f12c2de4f542e3220e17e0606f492110064f04cb)"}}], "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": "generic", "value": "6.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.108,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.49,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.13,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.3,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "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"}], "created": "2026-09-04T19:30:04.993348+00:00", "updated": "2026-09-05T03:30:18.187670+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-125"]}