CVE-2026-90327
UnknownSummary
In the Linux kernel, the pep_getsockopt() function in the phonet module clamped the reported length to the caller's buffer using min_t(), but then stored the value with put_user(), which always writes sizeof(int) bytes. A getsockopt() call with an optlen smaller than sizeof(int) thus reported the clamped length yet wrote a full int, one to three bytes past the user buffer.
Risk Assessment
May lead to memory corruption in user space (out-of-bounds write) and potential exploitation for privilege escalation or process destabilization.
Recommendation
Update the Linux kernel to a version containing the fix that uses copy_to_user() bounded by len so at most optlen bytes are copied.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS