Description

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

arm64: mops: Do not dereference src reg for a set operation

The source register is not used for SET* and reading it can result in
a UBSAN out-of-bounds array access error, specifically when the MOPS
exception is taken from a SET* sequence with XZR (reg 31) as the
source. Architecturally this is the only case where a src/dst/size
field in the ESR can be reported as 31.

Prior to 2de451a329cf662b the code in do_el0_mops() was benign as the
use of pt_regs_read_reg() prevented the out-of-bounds access.

Classification

CVE ID: CVE-2025-37846

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 4.6% (scored less or equal to compared to others)

EPSS Date: 2025-06-07 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-37846
https://git.kernel.org/stable/c/eec737e17e5567e08148550a7f1d94d495b9fb17
https://git.kernel.org/stable/c/43267d934eacff6c70e15545d804ebbcab8a0bf5
https://git.kernel.org/stable/c/5f6022a74147675124b781fdc056b291850e7786
https://git.kernel.org/stable/c/a13bfa4fe0d6949cea14718df2d1fe84c38cd113

Timeline