{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31657","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.129Z","datePublished":"2026-04-24T14:45:08.867Z","dateUpdated":"2026-04-27T14:04:44.948Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-04-27T14:04:44.948Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: hold claim backbone gateways by reference\n\nbatadv_bla_add_claim() can replace claim->backbone_gw and drop the old\ngateway's last reference while readers still follow the pointer.\n\nThe netlink claim dump path dereferences claim->backbone_gw->orig and\ntakes claim->backbone_gw->crc_lock without pinning the underlying\nbackbone gateway. batadv_bla_check_claim() still has the same naked\npointer access pattern.\n\nReuse batadv_bla_claim_get_backbone_gw() in both readers so they operate\non a stable gateway reference until the read-side work is complete.\nThis keeps the dump and claim-check paths aligned with the lifetime\nrules introduced for the other BLA claim readers."}],"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"}}],"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":"f4858832ddef2f39f21e30b7226bbcd3c4b2bc96","status":"affected","versionType":"git"},{"version":"23721387c409087fd3b97e274f34d3ddc0970b74","lessThan":"2f55b58b5a0bbed192d60c444a45a49cdf1b545f","status":"affected","versionType":"git"},{"version":"23721387c409087fd3b97e274f34d3ddc0970b74","lessThan":"7962b522222628596ca9ecc8722efc95367aadbd","status":"affected","versionType":"git"},{"version":"23721387c409087fd3b97e274f34d3ddc0970b74","lessThan":"4dee4c0688443aaf5bbec74aa203c851d1d53c35","status":"affected","versionType":"git"},{"version":"23721387c409087fd3b97e274f34d3ddc0970b74","lessThan":"1f2dc36c297d27733f1b380ea644cf15a361bd7b","status":"affected","versionType":"git"},{"version":"23721387c409087fd3b97e274f34d3ddc0970b74","lessThan":"82d8701b2c930d0e96b0dbc9115a218d791cb0d2","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":"6.1.169","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.135","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.82","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.23","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.13","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","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":"6.1.169"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.5","versionEndExcluding":"6.6.135"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.5","versionEndExcluding":"6.12.82"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.5","versionEndExcluding":"6.18.23"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.5","versionEndExcluding":"6.19.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.5","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96"},{"url":"https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f"},{"url":"https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd"},{"url":"https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35"},{"url":"https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b"},{"url":"https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2"}],"title":"batman-adv: hold claim backbone gateways by reference","x_generator":{"engine":"bippy-1.2.0"}}}}