CVE-2026-90327

Description

In the Linux kernel, the following vulnerability has been resolved: phonet: pep: do not write beyond optlen in getsockopt pep_getsockopt() clamps the reported length to the caller's buffer with min_t(), but then stores the value with put_user(val, (int __user *) optval), which always writes sizeof(int) bytes. A getsockopt() call with an optlen smaller than sizeof(int) thus reports the clamped length yet writes a full int, one to three bytes past the user buffer. Write the value with copy_to_user() bounded by len, so at most optlen bytes are copied, matching the length reported back to userspace.

References

• https://git.kernel.org/stable/c/056eea1a2068ad2fb7c3093c5f1095268f87d0c7
• https://git.kernel.org/stable/c/1bf499e438da80455e258049bce60ffb3a53f3fa
• https://git.kernel.org/stable/c/6054fed6bad08b6d03973e8ffca7f0c9394d1c30
• https://git.kernel.org/stable/c/77e5eb0e192aec6710c03ca8144582fd2af36ca4
• https://git.kernel.org/stable/c/95e0ed2439dd1792eb454c68ae8d10f30ffe3bff