CVE-2026-90157bpf: Reject negative optlen in cgroup getsockopt hook
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 08f61a34913558e06576e7b6318bf583f273c1be builds before 5b09d984b38b018b123c3a9e02a96bbc6468dbe5; from 9cacf81f8161111db25f98e78a7a0e32ae142b3f before 554ba7195c4108726450e24480c8449990c2268c; from 9cacf81f8161111db25f98e78a7a0e32ae142b3f before d02a12b4085ffe41ea750b1007f7a9c7aee2875a; from 9cacf81f8161111db25f98e78a7a0e32ae142b3f before e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2; from 9cacf81f8161111db25f98e78a7a0e32ae142b3f before f68671b1a98d426c57864bd457c125fee14ac1a5; 9cacf81f8161111db25f98e78a7a0e32ae142b3f builds before 2bdbe00454200fcb0110f31eeca8d906a3515e74; from 9cacf81f8161111db25f98e78a7a0e32ae142b3f before 31a89af4f513d750fec196e2bb6195a7d4473e9f; 9cacf81f8161111db25f98e78a7a0e32ae142b3f builds before 1b5aacd5b2419b0790e955e466d389a61c79b4b1; and 1 more ranges | CNA record |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.