CVE-2026-90157
Description
AI Translation Available
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.
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