CVE-2026-46233

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In this case, backbone_gw is set to NULL before the\ndelayed RCU kfree is started. Calling batadv_bla_claim_get_backbone_gw() is\nthen no longer allowed because it would cause a NULL-ptr derefence.\n\nTo avoid this, only claims with a valid reference counter must be purged.\nAll others are already taken care of."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/bridge_loop_avoidance.c"], "versions": [{"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "a9f58d5e3261f3deeae69ec1e237f38ef3ff5cbe", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "6725c523a35eeca611ff37e7d4a8712fae92aefd", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "afb5436f6028fd68f408f189230fbaa19c910d72", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "7b8fbcee3184d848b5aee085ca16d0cf05c9b641", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "7b7ebb7222a5524ce58e48cc9c6d688320ea6cfe", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "b65365d2b1e6095c538d49baeb140dd1c166c1b3", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "ab3dbd07a809a8eb30c7ddfab9ac886ed30dce8d", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "cf6b604011591865ae39ac82de8978c1120d17af", "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/bridge_loop_avoidance.c"], "versions": [{"version": "3.5", "status": "affected"}, {"version": "0", "lessThan": "3.5", "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": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.90", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.32", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.9", "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": "3.5", "versionEndExcluding": "5.10.258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.6.140"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.12.90"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.18.32"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.0.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a9f58d5e3261f3deeae69ec1e237f38ef3ff5cbe"}, {"url": "https://git.kernel.org/stable/c/6725c523a35eeca611ff37e7d4a8712fae92aefd"}, {"url": "https://git.kernel.org/stable/c/afb5436f6028fd68f408f189230fbaa19c910d72"}, {"url": "https://git.kernel.org/stable/c/7b8fbcee3184d848b5aee085ca16d0cf05c9b641"}, {"url": "https://git.kernel.org/stable/c/7b7ebb7222a5524ce58e48cc9c6d688320ea6cfe"}, {"url": "https://git.kernel.org/stable/c/b65365d2b1e6095c538d49baeb140dd1c166c1b3"}, {"url": "https://git.kernel.org/stable/c/ab3dbd07a809a8eb30c7ddfab9ac886ed30dce8d"}, {"url": "https://git.kernel.org/stable/c/cf6b604011591865ae39ac82de8978c1120d17af"}], "title": "batman-adv: bla: only purge non-released claims", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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of claims, it is only\ntraversing the hash list with an rcu_read_lock(). Due to a potential\nparallel batadv_claim_put(), it can happen that it encounters a claim which\nwas actually in the process of being released+freed by\nbatadv_claim_release(). In this case, backbone_gw is set to NULL before the\ndelayed RCU kfree is started. Calling batadv_bla_claim_get_backbone_gw() is\nthen no longer allowed because it would cause a NULL-ptr derefence.\n\nTo avoid this, only claims with a valid reference counter must be purged.\nAll others are already taken care of."}], "id": "CVE-2026-46233", "lastModified": "2026-06-17T10:53:22.900", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-28T10:16:38.943", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6725c523a35eeca611ff37e7d4a8712fae92aefd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7b7ebb7222a5524ce58e48cc9c6d688320ea6cfe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7b8fbcee3184d848b5aee085ca16d0cf05c9b641"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a9f58d5e3261f3deeae69ec1e237f38ef3ff5cbe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ab3dbd07a809a8eb30c7ddfab9ac886ed30dce8d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/afb5436f6028fd68f408f189230fbaa19c910d72"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b65365d2b1e6095c538d49baeb140dd1c166c1b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cf6b604011591865ae39ac82de8978c1120d17af"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: batman-adv: bla: only purge non-released claims", "id": "2482561", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482561"}, "csaw": false, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's batman-adv module. This vulnerability allows a local attacker to trigger a NULL-pointer dereference within the `batadv_bla_purge_claims()` function. This issue arises from a timing conflict when a claim is being released simultaneously, causing a critical pointer to become invalid. Successful exploitation of this flaw can lead to a system crash, resulting in a denial of service (DoS)."], "name": "CVE-2026-46233", "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": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46233\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46233\nhttps://lore.kernel.org/linux-cve-announce/2026052840-CVE-2026-46233-1e33@gregkh/T"]}

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