{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74740","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.930Z","datePublished":"2026-08-26T14:36:52.344Z","dateUpdated":"2026-08-26T14:36:52.344Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-26T14:36:52.344Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_api: fix TOCTOU NULL deref on a->goto_chain\n\ntcf_action_exec() handles TC_ACT_GOTO_CHAIN by first checking\nrcu_access_pointer(a->goto_chain) and then calling\ntcf_action_goto_chain_exec(), which does a second, independent\nrcu_dereference_bh(a->goto_chain) read and immediately dereferences\nchain->filter_chain. A concurrent tcf_action_set_ctrlact() (e.g. the gact\nreplace path) can clear a->goto_chain between the two reads, so the second\nread returns NULL and tcf_action_goto_chain_exec() dereferences NULL.\n\nFix the race by doing a single rcu_dereference_bh() read of a->goto_chain\nin tcf_action_exec(), checking it once for NULL, and passing the resulting\nchain pointer into tcf_action_goto_chain_exec(). This turns the split\ncheck/use into a single check/use on one value."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/act_api.c"],"versions":[{"version":"ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5","lessThan":"91d55fd1fdb85c8371ca8793c788ea7d5192383a","status":"affected","versionType":"git"},{"version":"ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5","lessThan":"1ec48b6715c29b20105e3485206602cff6c51ae5","status":"affected","versionType":"git"},{"version":"ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5","lessThan":"abceabc4408fca6a9dd52611f5d197dec9390d63","status":"affected","versionType":"git"},{"version":"ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5","lessThan":"6b70886ebc428eed43a069c8944a931b5fb3f4e4","status":"affected","versionType":"git"},{"version":"ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5","lessThan":"f60b396ee174206fe08ebf997d16cd3801b77b22","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/sched/act_api.c"],"versions":[{"version":"5.1","status":"affected"},{"version":"0","lessThan":"5.1","status":"unaffected","versionType":"semver"},{"version":"6.6.153","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.105","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.46","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.10","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":"5.1","versionEndExcluding":"6.6.153"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.12.105"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.18.46"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"7.1.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/91d55fd1fdb85c8371ca8793c788ea7d5192383a"},{"url":"https://git.kernel.org/stable/c/1ec48b6715c29b20105e3485206602cff6c51ae5"},{"url":"https://git.kernel.org/stable/c/abceabc4408fca6a9dd52611f5d197dec9390d63"},{"url":"https://git.kernel.org/stable/c/6b70886ebc428eed43a069c8944a931b5fb3f4e4"},{"url":"https://git.kernel.org/stable/c/f60b396ee174206fe08ebf997d16cd3801b77b22"}],"title":"net/sched: act_api: fix TOCTOU NULL deref on a->goto_chain","x_generator":{"engine":"bippy-1.2.0"}}}}