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.
How to fix
- Linux Linux5b09d984b38b018b123c3a9e02a96bbc6468dbe5, 554ba7195c4108726450e24480c8449990c2268c, d02a12b4085ffe41ea750b1007f7a9c7aee2875a, e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2, f68671b1a98d426c57864bd457c125fee14ac1a5, 2bdbe00454200fcb0110f31eeca8d906a3515e74, 31a89af4f513d750fec196e2bb6195a7d4473e9f, 1b5aacd5b2419b0790e955e466d389a61c79b4b1, 5.10.270 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 08f61a34913558e06576e7b6318bf583f273c1be ≤ v < 5b09d984b38b018b123c3a9e02a96bbc6468dbe5, 9cacf81f8161111db25f98e78a7a0e32ae142b3f ≤ v < 554ba7195c4108726450e24480c8449990c2268c, 9cacf81f8161111db25f98e78a7a0e32ae142b3f ≤ v < d02a12b4085ffe41ea750b1007f7a9c7aee2875a, 9cacf81f8161111db25f98e78a7a0e32ae142b3f ≤ v < e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2, 9cacf81f8161111db25f98e78a7a0e32ae142b3f ≤ v < f68671b1a98d426c57864bd457c125fee14ac1a5, 9cacf81f8161111db25f98e78a7a0e32ae142b3f ≤ v < 2bdbe00454200fcb0110f31eeca8d906a3515e74, 9cacf81f8161111db25f98e78a7a0e32ae142b3f ≤ v < 31a89af4f513d750fec196e2bb6195a7d4473e9f, 9cacf81f8161111db25f98e78a7a0e32ae142b3f ≤ v < 1b5aacd5b2419b0790e955e466d389a61c79b4b1, 5.10.188 ≤ v < 5.10.270, 5.12 | 5b09d984b38b018b123c3a9e02a96bbc6468dbe5, 554ba7195c4108726450e24480c8449990c2268c, d02a12b4085ffe41ea750b1007f7a9c7aee2875a, e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2, f68671b1a98d426c57864bd457c125fee14ac1a5, 2bdbe00454200fcb0110f31eeca8d906a3515e74, 31a89af4f513d750fec196e2bb6195a7d4473e9f, 1b5aacd5b2419b0790e955e466d389a61c79b4b1, 5.10.270 |
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