CVE-2026-72233

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Variables which were pointing to the old buffer\nneed to be reassigned 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 in batadv_recv_unicast_packet() when batman-adv ETH_P_BATMAN frames are received on a mesh hard interface via batadv_batman_skb_recv(); exploitation requires a peer on the same wireless/bridged mesh segment (community, industrial, or gateway meshes), matching adjacent Wi-Fi/L2 reachability rather than arbitrary Internet routing.\nAC:L - An on-mesh attacker fully controls the injected unicast skb (headers, VLAN tagging) to make batadv_bla_is_backbone_gw()'s pskb_may_pull() reallocate the buffer; this is a deterministic use-after-free with no victim-timed race or layout the attacker cannot influence by resending crafted frames.\nPR:N - No account or capability on the victim host is required; any unauthenticated mesh participant (or L2 source spoofer on the mesh/backbone) can send batman-adv unicast packets destined to the victim's MAC through the normal RX handler without local login or CAP_NET_ADMIN on the target.\nUI:N - The vulnerable path runs automatically in softirq when the mesh interface receives qualifying unicast traffic; the victim operator does not need to mount a filesystem, click a link, or perform any deliberate action beyond running an active batman-adv mesh with bridge loop avoidance enabled.\nS:U - Exploitation corrupts or reads kernel heap memory inside the batman-adv RX path on the same host; it does not cross a VM/hypervisor, container, or IOMMU security boundary to impact a different authority's resources.\nC:H - After pskb_may_pull() frees the old skb head, the stale orig_addr_gw pointer is read through %pM in batadv_dbg(), constituting a kernel slab use-after-free that can disclose adjacent freed-object contents and is scored as arbitrary-read class per UAF guidance.\nI:H - Use-after-free of skb linear data is heap memory corruption; even though the immediate stale access is for logging, UAF on RX skbs enables spray/reuse of the freed buffer for control of subsequent kernel objects and potential write primitives.\nA:H - Dereferencing a freed skb buffer in interrupt/RX context can trigger KASAN slab-use-after-free reports, kernel oops, or panic on affected builds; any exploitable UAF on the packet receive path is rated high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/routing.c"], "versions": [{"version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "41819c5467b6eb8ab4567f0ac98702ce9b6abbb1", "status": "affected", "versionType": "git"}, {"version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": 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"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": "4.12", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", 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"https://git.kernel.org/stable/c/e5e18886aadd3870e2d84e32a9678317fab1dd9e"}, {"url": "https://git.kernel.org/stable/c/f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf"}, {"url": "https://git.kernel.org/stable/c/cdf3b5af2bc4431e58629e8ad2086b1e9185c761"}], "title": "batman-adv: bla: reacquire gw address after skb realloc", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72233", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:44:31.631012Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:45:03.576Z"}}]}}

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this is a deterministic use-after-free with no victim-timed race or layout the attacker cannot influence by resending crafted frames.\nPR:N - No account or capability on the victim host is required; any unauthenticated mesh participant (or L2 source spoofer on the mesh/backbone) can send batman-adv unicast packets destined to the victim's MAC through the normal RX handler without local login or CAP_NET_ADMIN on the target.\nUI:N - The vulnerable path runs automatically in softirq when the mesh interface receives qualifying unicast traffic; the victim operator does not need to mount a filesystem, click a link, or perform any deliberate action beyond running an active batman-adv mesh with bridge loop avoidance enabled.\nS:U - Exploitation corrupts or reads kernel heap memory inside the batman-adv RX path on the same host; it does not cross a VM/hypervisor, container, or IOMMU security boundary to impact a different authority's resources.\nC:H - After pskb_may_pull() frees the old skb head, the stale orig_addr_gw pointer is read through %pM in batadv_dbg(), constituting a kernel slab use-after-free that can disclose adjacent freed-object contents and is scored as arbitrary-read class per UAF guidance.\nI:H - Use-after-free of skb linear data is heap memory corruption; even though the immediate stale access is for logging, UAF on RX skbs enables spray/reuse of the freed buffer for control of subsequent kernel objects and potential write primitives.\nA:H - Dereferencing a freed skb buffer in interrupt/RX context can trigger KASAN slab-use-after-free reports, kernel oops, or panic on affected builds; any exploitable UAF on the packet receive path is rated high availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "41819c5467b6eb8ab4567f0ac98702ce9b6abbb1", "versionType": "git"}, {"status": "affected", "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f", "versionType": "git"}, {"status": "affected", "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "4a6673c55752a7aa41e28f51660eb981504ca088", "versionType": "git"}, {"status": "affected", "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "ab2bac47a02637df1128a151e81d3ec14767f4bb", "versionType": "git"}, {"status": "affected", "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "dc16bbf53cede1baf564bf0c8a861114b64e18b3", "versionType": "git"}, {"status": "affected", "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "e5e18886aadd3870e2d84e32a9678317fab1dd9e", "versionType": "git"}, {"status": "affected", "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf", "versionType": "git"}, {"status": "affected", "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "cdf3b5af2bc4431e58629e8ad2086b1e9185c761", "versionType": "git"}], "programFiles": ["net/batman-adv/routing.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.12"}, {"status": "unaffected", "version": "0", "lessThan": "4.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.261", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.212", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/batman-adv/routing.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/41819c5467b6eb8ab4567f0ac98702ce9b6abbb1"}, {"url": "https://git.kernel.org/stable/c/a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f"}, {"url": "https://git.kernel.org/stable/c/4a6673c55752a7aa41e28f51660eb981504ca088"}, {"url": "https://git.kernel.org/stable/c/ab2bac47a02637df1128a151e81d3ec14767f4bb"}, {"url": "https://git.kernel.org/stable/c/dc16bbf53cede1baf564bf0c8a861114b64e18b3"}, {"url": "https://git.kernel.org/stable/c/e5e18886aadd3870e2d84e32a9678317fab1dd9e"}, {"url": "https://git.kernel.org/stable/c/f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf"}, {"url": "https://git.kernel.org/stable/c/cdf3b5af2bc4431e58629e8ad2086b1e9185c761"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: reacquire gw address after skb realloc\n\nThe pskb_may_pull() called by batadv_bla_is_backbone_gw() could reallocate\nthe buffer behind the skb. Variables which were pointing to the old buffer\nneed to be reassigned to avoid an use-after-free."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "4.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:41:50.777Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72233", "state": "PUBLISHED", "dateUpdated": "2026-10-16T18:45:03.576Z", "dateReserved": "2026-08-09T03:40:39.913Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:54:23.663Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Variables which were pointing to the old buffer\nneed to be reassigned to avoid an use-after-free."}], "id": "CVE-2026-72233", "lastModified": "2026-10-16T19:17:15.680", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72233", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:44:31.631012Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:21:50.253", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/41819c5467b6eb8ab4567f0ac98702ce9b6abbb1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4a6673c55752a7aa41e28f51660eb981504ca088"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ab2bac47a02637df1128a151e81d3ec14767f4bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cdf3b5af2bc4431e58629e8ad2086b1e9185c761"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dc16bbf53cede1baf564bf0c8a861114b64e18b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e5e18886aadd3870e2d84e32a9678317fab1dd9e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: batman-adv: bla: reacquire gw address after skb realloc", "id": "2516492", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516492"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the `batman-adv` component of the Linux kernel. This vulnerability occurs when a buffer is reallocated, but existing pointers are not updated, leading to a use-after-free condition. A local attacker could potentially exploit this to cause a system crash (denial of service) or, in some cases, execute arbitrary code with elevated privileges."], "name": "CVE-2026-72233", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72233\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72233\nhttps://lore.kernel.org/linux-cve-announce/2026081549-CVE-2026-72233-92c6@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e794b6bf4a2c65d698d7433ddfabc54a5d53a88,41819c5467b6eb8ab4567f0ac98702ce9b6abbb1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e794b6bf4a2c65d698d7433ddfabc54a5d53a88,a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e794b6bf4a2c65d698d7433ddfabc54a5d53a88,4a6673c55752a7aa41e28f51660eb981504ca088)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e794b6bf4a2c65d698d7433ddfabc54a5d53a88,ab2bac47a02637df1128a151e81d3ec14767f4bb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e794b6bf4a2c65d698d7433ddfabc54a5d53a88,cdf3b5af2bc4431e58629e8ad2086b1e9185c761)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e794b6bf4a2c65d698d7433ddfabc54a5d53a88,dc16bbf53cede1baf564bf0c8a861114b64e18b3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e794b6bf4a2c65d698d7433ddfabc54a5d53a88,e5e18886aadd3870e2d84e32a9678317fab1dd9e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e794b6bf4a2c65d698d7433ddfabc54a5d53a88,f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf)"}}], "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": "semver", "value": "4.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.261,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.212,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc2, *]"}}], "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": "2026-08-15T09:30:04.897903+00:00", "updated": "2026-08-22T10:45:03.929995+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}