CVE-2026-90157

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.