{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80601", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.771Z", "datePublished": "2026-08-28T06:48:27.948Z", "dateUpdated": "2026-10-16T19:26:29.891Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:21:13.415Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: gw: acquire ethernet header only after skb realloc\n\nThe pskb_may_pull() called by batadv_get_vid() could reallocate the buffer\nbehind the skb. Variables which were pointing to the old buffer need to be\nreassigned to avoid an use-after-free." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The bug is hit only in batadv_interface_tx on outgoing bat0 traffic; the highest-impact path is an unauthenticated client on the same WiFi/LAN segment bridged to a batman-adv gateway node sending a crafted VLAN-tagged DHCP packet into bat0.\nAC:L - Triggering is synchronous and attacker-controlled: a VLAN-tagged DHCP discover/request shaped to force pskb_may_pull() skb reallocation deterministically hits the stale ethhdr UAF without races or victim-specific timing.\nPR:N - No privileges on the mesh router are required when a client on a bridged WiFi/LAN port injects the malicious DHCP frame; gateway-client mode is operator configuration, not an attacker privilege.\nUI:N - Exploitation requires no victim interaction beyond normal always-on mesh bridging and DHCP forwarding; the attacker only sends a malicious frame.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the same kernel/host security boundary, not a cross-boundary escape such as VM or sandbox breakout.\nC:H - This is a use-after-free read: after skb reallocation, ethhdr->h_source/h_dest dereference freed skb head memory, enabling uncontrolled kernel memory disclosure and further exploitation primitives.\nI:H - UAF on skb data can corrupt routing lookups (batadv_transtable_search) and adjacent kernel heap state, providing a standard path to controlled writes and arbitrary kernel code execution.\nA:H - Reading freed skb memory via ethhdr commonly causes kernel oops/panic on the batman-adv gateway node, yielding complete loss of mesh connectivity and host availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/gateway_client.c" ], "versions": [ { "version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9", "lessThan": "2760b38222c8828b075802342fe3b91eb823d542", "status": "affected", "versionType": "git" }, { "version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9", "lessThan": "6c37f1166549c999ccd164b0cb6462d1ae68f8f6", "status": "affected", "versionType": "git" }, { "version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9", "lessThan": "b79884a5567bf788fb76c30832467cf6a56f3c0d", "status": "affected", "versionType": "git" }, { "version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9", "lessThan": "afac8096bde4948e3caa7e4dd733867cfbd3018e", "status": "affected", "versionType": "git" }, { "version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9", "lessThan": "e3f4325e35dd6e76b80665f3510738ce34819753", "status": "affected", "versionType": "git" }, { "version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9", "lessThan": "e6b43acd34b219b807e65096ce207b087942779d", "status": "affected", "versionType": "git" }, { "version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9", "lessThan": "916dac5f2944f63f07f7b501acbea6737dbbed0e", "status": "affected", "versionType": "git" }, { "version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9", "lessThan": "77880a3be88d378d60cc1e8f8ec70430e2ed0518", "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/gateway_client.c" ], "versions": [ { "version": "3.14", "status": "affected" }, { "version": "0", "lessThan": "3.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "3.14", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2760b38222c8828b075802342fe3b91eb823d542" }, { "url": "https://git.kernel.org/stable/c/6c37f1166549c999ccd164b0cb6462d1ae68f8f6" }, { "url": "https://git.kernel.org/stable/c/b79884a5567bf788fb76c30832467cf6a56f3c0d" }, { "url": "https://git.kernel.org/stable/c/afac8096bde4948e3caa7e4dd733867cfbd3018e" }, { "url": "https://git.kernel.org/stable/c/e3f4325e35dd6e76b80665f3510738ce34819753" }, { "url": "https://git.kernel.org/stable/c/e6b43acd34b219b807e65096ce207b087942779d" }, { "url": "https://git.kernel.org/stable/c/916dac5f2944f63f07f7b501acbea6737dbbed0e" }, { "url": "https://git.kernel.org/stable/c/77880a3be88d378d60cc1e8f8ec70430e2ed0518" } ], "title": "batman-adv: gw: acquire ethernet header only after skb realloc", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-80601", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:18:26.470737Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:29.891Z" } } ] } }