{"id":"CVE-2026-90157","published":"2026-09-17T17:17:08.817","lastModified":"2026-09-17T17:17:08.817","description":"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-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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1","tags":[]},{"url":"https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74","tags":[]},{"url":"https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f","tags":[]},{"url":"https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c","tags":[]},{"url":"https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5","tags":[]},{"url":"https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a","tags":[]},{"url":"https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2","tags":[]},{"url":"https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}