CVE-2026-90157
Description
In 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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
References
- https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1
- https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74
- https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f
- https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c
- https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5
- https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a
- https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2
- https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.