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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
08f61a34913558e06576e7b6318bf583f273c1be to < 5b09d984b38b018b123c3a9e02a96bbc6468dbe5affected9cacf81f8161111db25f98e78a7a0e32ae142b3f to < 554ba7195c4108726450e24480c8449990c2268caffected9cacf81f8161111db25f98e78a7a0e32ae142b3f to < d02a12b4085ffe41ea750b1007f7a9c7aee2875aaffected9cacf81f8161111db25f98e78a7a0e32ae142b3f to < e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2affected9cacf81f8161111db25f98e78a7a0e32ae142b3f to < f68671b1a98d426c57864bd457c125fee14ac1a5affected9cacf81f8161111db25f98e78a7a0e32ae142b3f to < 2bdbe00454200fcb0110f31eeca8d906a3515e74affected9cacf81f8161111db25f98e78a7a0e32ae142b3f to < 31a89af4f513d750fec196e2bb6195a7d4473e9faffected9cacf81f8161111db25f98e78a7a0e32ae142b3f to < 1b5aacd5b2419b0790e955e466d389a61c79b4b1affected5.10.188 to < 5.10.270affected
Linux Linux
Default version status: affected
5.12affected0 to < 5.12unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
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 ↗