phonet: pep: do not write beyond optlen in getsockopt

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.

Timeline

1. Sep 17, 2026, 4:08 PM UTCCVE published
2. Oct 19, 2026, 9:01 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a · fixed in 6054fed6bad08b6d03973e8ffca7f0c9394d1c30; From 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a · fixed in eac733a0b6fe0a52d91f9f623425735ed50ac6c2; From 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a · fixed in 95e0ed2439dd1792eb454c68ae8d10f30ffe3bff; From 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a · fixed in 056eea1a2068ad2fb7c3093c5f1095268f87d0c7; From 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a · fixed in 1bf499e438da80455e258049bce60ffb3a53f3fa; From 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a · fixed in c4487e4d5309de587479ecc2f5173b49586f46f4; From 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a · fixed in f97022fefe6eb06ee18549d603420440f2959802; From 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a · fixed in 77e5eb0e192aec6710c03ca8144582fd2af36ca4

• Linux Linux

  2.6.28

• KernelLinux

  From 2.6.28 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 8