bpf: Reject negative optlen in cgroup getsockopt hook

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90157
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:08 UTC
Updated2026-09-17 17:17:08 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Reject negative optlen in cgroup getsockopt hook A cgroup getsockopt BPF program can shrink ctx->optlen after the kernel getsockopt handler has run. The kernel-buffer variant, used by TCP_ZEROCOPY_RECEIVE, only rejects values larger than the original length. If BPF writes a negative optlen, that value is accepted and propagated back to the TCP getsockopt code. It can then be passed to copy_to_sockptr() as a size_t and trigger the hardened usercopy bytes > INT_MAX warning. Reject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(), matching the lower-bound validation already present in the sockptr-based getsockopt hook.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 08f61a34913558e06576e7b6318bf583f273c1be 5b09d984b38b018b123c3a9e02a96bbc6468dbe5 git Not specified
CNA Linux Linux affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f 554ba7195c4108726450e24480c8449990c2268c git Not specified
CNA Linux Linux affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f d02a12b4085ffe41ea750b1007f7a9c7aee2875a git Not specified
CNA Linux Linux affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2 git Not specified
CNA Linux Linux affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f f68671b1a98d426c57864bd457c125fee14ac1a5 git Not specified
CNA Linux Linux affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f 2bdbe00454200fcb0110f31eeca8d906a3515e74 git Not specified
CNA Linux Linux affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f 31a89af4f513d750fec196e2bb6195a7d4473e9f git Not specified
CNA Linux Linux affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f 1b5aacd5b2419b0790e955e466d389a61c79b4b1 git Not specified
CNA Linux Linux affected 5.10.188 5.10.270 semver Not specified
CNA Linux Linux affected 5.12 Not specified
CNA Linux Linux unaffected 5.12 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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