CVE-2025-37846

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

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.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
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

Frequently Asked Questions

What is the severity of CVE-2025-37846?: CVE-2025-37846 has not yet been assigned a CVSS score.
How to fix CVE-2025-37846?: To fix CVE-2025-37846, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-37846 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-37846 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-37846?: CVE-2025-37846 affects Linux Linux, Linux Linux.

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