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CVE-2026-90327

Unknown

Last modified

CVE-2026-90327 is a vulnerability of currently unknown severity. 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..

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a, < 6054fed6bad08b6d03973e8ffca7f0c9394d1c30; >= 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a, < eac733a0b6fe0a52d91f9f623425735ed50ac6c2; >= 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a, < 95e0ed2439dd1792eb454c68ae8d10f30ffe3bff; >= 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a, < 056eea1a2068ad2fb7c3093c5f1095268f87d0c7; >= 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a, < 1bf499e438da80455e258049bce60ffb3a53f3fa; >= 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a, < c4487e4d5309de587479ecc2f5173b49586f46f4; >= 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a, < f97022fefe6eb06ee18549d603420440f2959802; >= 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a, < 77e5eb0e192aec6710c03ca8144582fd2af36ca4
LinuxLinux2.6.28

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90327?
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.
How severe is CVE-2026-90327?
Severity scoring for CVE-2026-90327 is pending analysis.
How do I fix CVE-2026-90327?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST