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.

https://git.kernel.org/stable/c/01f3ce411711c2c919598ea25320a5a48f71edbc

https://git.kernel.org/stable/c/036bc5661060702e798d215e81bb46da530965b3

https://git.kernel.org/stable/c/096dff1247037d329c04b3a5be0ecdfb1c5c7ac6

https://git.kernel.org/stable/c/2995ccec260caa9e85b3301a4aba1e66ed80ad74

https://git.kernel.org/stable/c/759d91378203ea35fa9bca6726dcf0010de081fb

https://git.kernel.org/stable/c/ae5347f3db1782c6118f6cc0d9fd8b1d43397db3

https://git.kernel.org/stable/c/d39cf4a6d721b1ae21eb53bbf3e8cd984253d7ab

https://git.kernel.org/stable/c/f0745496f7c171271cafd9457df3b914a483ddeb

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