{"id":"CVE-2026-90157","title":"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","summary":"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-bu…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 08f61a34913558e06576e7b6318bf583f273c1be < 5b09d984b38b018b123c3a9e02a96bbc6468dbe5","Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f < 554ba7195c4108726450e24480c8449990c2268c","Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f < d02a12b4085ffe41ea750b1007f7a9c7aee2875a","Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f < e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2","Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f < f68671b1a98d426c57864bd457c125fee14ac1a5","Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f < 2bdbe00454200fcb0110f31eeca8d906a3515e74","Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f < 31a89af4f513d750fec196e2bb6195a7d4473e9f","Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f < 1b5aacd5b2419b0790e955e466d389a61c79b4b1","Linux >= 5.10.188 < 5.10.270","Linux 5.12"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:08.817","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90157","references":[{"url":"https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.873Z","epss":0.0021,"epssPercentile":0.11536,"slug":"CVE-2026-90157","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}