CVE-2026-72025s390/monwriter: Reject buffer reuse with different data length
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 31b58088292c7f00f0b81088bfb557285b0b6247 before 096dff1247037d329c04b3a5be0ecdfb1c5c7ac6; from 31b58088292c7f00f0b81088bfb557285b0b6247 before d39cf4a6d721b1ae21eb53bbf3e8cd984253d7ab; from 31b58088292c7f00f0b81088bfb557285b0b6247 before 759d91378203ea35fa9bca6726dcf0010de081fb; from 31b58088292c7f00f0b81088bfb557285b0b6247 before 036bc5661060702e798d215e81bb46da530965b3; 31b58088292c7f00f0b81088bfb557285b0b6247 builds before 01f3ce411711c2c919598ea25320a5a48f71edbc; from 31b58088292c7f00f0b81088bfb557285b0b6247 before f0745496f7c171271cafd9457df3b914a483ddeb; from 31b58088292c7f00f0b81088bfb557285b0b6247 before ae5347f3db1782c6118f6cc0d9fd8b1d43397db3; from 31b58088292c7f00f0b81088bfb557285b0b6247 before 2995ccec260caa9e85b3301a4aba1e66ed80ad74 | CNA record |
References
- https://git.kernel.org/stable/c/096dff1247037d329c04b3a5be0ecdfb1c5c7ac6
- https://git.kernel.org/stable/c/d39cf4a6d721b1ae21eb53bbf3e8cd984253d7ab
- https://git.kernel.org/stable/c/759d91378203ea35fa9bca6726dcf0010de081fb
- https://git.kernel.org/stable/c/036bc5661060702e798d215e81bb46da530965b3
- https://git.kernel.org/stable/c/01f3ce411711c2c919598ea25320a5a48f71edbc
- https://git.kernel.org/stable/c/f0745496f7c171271cafd9457df3b914a483ddeb
- https://git.kernel.org/stable/c/ae5347f3db1782c6118f6cc0d9fd8b1d43397db3
- https://git.kernel.org/stable/c/2995ccec260caa9e85b3301a4aba1e66ed80ad74
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.