CVE-2026-72025

Summary

In the Linux kernel, the following vulnerability has been resolved:

s390/monwriter: Reject buffer reuse with different data length

When data buffers are reused, e.g. for interval sample records, the first record determines the data length, and the size of the buffer for user copy. Current monwriter code does not check if the data length was changed for subsequent records, which also would never happen for valid user programs.

However, a malicious user could change the data length, resulting in out of bounds user copy to the kernel buffer, and memory corruption. By default, the monwriter misc device is created with root-only permissions, so practical impact is typically low.

Fix this by checking for changed data length and rejecting such records.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux31b58088292c7f00f0b81088bfb557285b0b6247 < 096dff1247037d329c04b3a5be0ecdfb1c5c7ac6affected
LinuxLinux31b58088292c7f00f0b81088bfb557285b0b6247 < d39cf4a6d721b1ae21eb53bbf3e8cd984253d7abaffected
LinuxLinux31b58088292c7f00f0b81088bfb557285b0b6247 < 759d91378203ea35fa9bca6726dcf0010de081fbaffected
LinuxLinux31b58088292c7f00f0b81088bfb557285b0b6247 < 036bc5661060702e798d215e81bb46da530965b3affected
LinuxLinux31b58088292c7f00f0b81088bfb557285b0b6247 < 01f3ce411711c2c919598ea25320a5a48f71edbcaffected
LinuxLinux31b58088292c7f00f0b81088bfb557285b0b6247 < f0745496f7c171271cafd9457df3b914a483ddebaffected
LinuxLinux31b58088292c7f00f0b81088bfb557285b0b6247 < ae5347f3db1782c6118f6cc0d9fd8b1d43397db3affected
LinuxLinux31b58088292c7f00f0b81088bfb557285b0b6247 < 2995ccec260caa9e85b3301a4aba1e66ed80ad74affected
LinuxLinux2.6.19affected
LinuxLinux0 < 2.6.19unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References