{"id":"CVE-2026-90157","state":"PUBLISHED","title":"bpf: Reject negative optlen in cgroup getsockopt hook","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject negative optlen in cgroup getsockopt hook\n\nA cgroup getsockopt BPF program can shrink ctx->optlen after the\nkernel getsockopt handler has run. The kernel-buffer variant, used by\nTCP_ZEROCOPY_RECEIVE, only rejects values larger than the original\nlength.\n\nIf BPF writes a negative optlen, that value is accepted and propagated\nback to the TCP getsockopt code. It can then be passed to\ncopy_to_sockptr() as a size_t and trigger the hardened usercopy\nbytes > INT_MAX warning.\n\nReject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(),\nmatching the lower-bound validation already present in the sockptr-based\ngetsockopt hook.","publishedAt":"2026-09-17T16:06:49.081Z","updatedAt":"2026-10-19T08:58:55.961Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"08f61a34913558e06576e7b6318bf583f273c1be","status":"affected","lessThan":"5b09d984b38b018b123c3a9e02a96bbc6468dbe5","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"554ba7195c4108726450e24480c8449990c2268c","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"d02a12b4085ffe41ea750b1007f7a9c7aee2875a","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"f68671b1a98d426c57864bd457c125fee14ac1a5","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"2bdbe00454200fcb0110f31eeca8d906a3515e74","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"31a89af4f513d750fec196e2bb6195a7d4473e9f","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"1b5aacd5b2419b0790e955e466d389a61c79b4b1","versionType":"git"},{"version":"5.10.188","status":"affected","lessThan":"5.10.270","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cgroup.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.12","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cgroup.c"]}],"references":["https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5","https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c","https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a","https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2","https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5","https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74","https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f","https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90157.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90157","state":"PUBLISHED","datePublished":"2026-09-17T16:06:49.081Z","dateUpdated":"2026-10-19T08:58:55.961Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.790Z"},"containers":{"cna":{"title":"bpf: Reject negative optlen in cgroup getsockopt hook","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject negative optlen in cgroup getsockopt hook\n\nA cgroup getsockopt BPF program can shrink ctx->optlen after the\nkernel getsockopt handler has run. The kernel-buffer variant, used by\nTCP_ZEROCOPY_RECEIVE, only rejects values larger than the original\nlength.\n\nIf BPF writes a negative optlen, that value is accepted and propagated\nback to the TCP getsockopt code. It can then be passed to\ncopy_to_sockptr() as a size_t and trigger the hardened usercopy\nbytes > INT_MAX warning.\n\nReject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(),\nmatching the lower-bound validation already present in the sockptr-based\ngetsockopt hook."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"08f61a34913558e06576e7b6318bf583f273c1be","status":"affected","lessThan":"5b09d984b38b018b123c3a9e02a96bbc6468dbe5","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"554ba7195c4108726450e24480c8449990c2268c","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"d02a12b4085ffe41ea750b1007f7a9c7aee2875a","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"f68671b1a98d426c57864bd457c125fee14ac1a5","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"2bdbe00454200fcb0110f31eeca8d906a3515e74","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"31a89af4f513d750fec196e2bb6195a7d4473e9f","versionType":"git"},{"version":"9cacf81f8161111db25f98e78a7a0e32ae142b3f","status":"affected","lessThan":"1b5aacd5b2419b0790e955e466d389a61c79b4b1","versionType":"git"},{"version":"5.10.188","status":"affected","lessThan":"5.10.270","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cgroup.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.12","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cgroup.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5"},{"url":"https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c"},{"url":"https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a"},{"url":"https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2"},{"url":"https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5"},{"url":"https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74"},{"url":"https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f"},{"url":"https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:58:55.961Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.188","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}