CVE-2026-90327

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux02a47617cdce440f60c71a51f3a93f9f5fcc5a7a < 6054fed6bad08b6d03973e8ffca7f0c9394d1c30affected
LinuxLinux02a47617cdce440f60c71a51f3a93f9f5fcc5a7a < eac733a0b6fe0a52d91f9f623425735ed50ac6c2affected
LinuxLinux02a47617cdce440f60c71a51f3a93f9f5fcc5a7a < 95e0ed2439dd1792eb454c68ae8d10f30ffe3bffaffected
LinuxLinux02a47617cdce440f60c71a51f3a93f9f5fcc5a7a < 056eea1a2068ad2fb7c3093c5f1095268f87d0c7affected
LinuxLinux02a47617cdce440f60c71a51f3a93f9f5fcc5a7a < 1bf499e438da80455e258049bce60ffb3a53f3faaffected
LinuxLinux02a47617cdce440f60c71a51f3a93f9f5fcc5a7a < c4487e4d5309de587479ecc2f5173b49586f46f4affected
LinuxLinux02a47617cdce440f60c71a51f3a93f9f5fcc5a7a < f97022fefe6eb06ee18549d603420440f2959802affected
LinuxLinux02a47617cdce440f60c71a51f3a93f9f5fcc5a7a < 77e5eb0e192aec6710c03ca8144582fd2af36ca4affected
LinuxLinux2.6.28affected
LinuxLinux0 < 2.6.28unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References