CVE-2025-37846: arm64: mops: Do not dereference src reg for a set operation

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-09 · updated 2026-06-17
Weakness: CWE-125

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.

Affected products

Linux kernel: from 6.7 before 6.12.24; from 6.13 before 6.13.12; from 6.14 before 6.14.3 — fixed in 6.12.24, 6.13.12, 6.14.3

How to fix

Upgrade to a fixed version: Linux kernel 6.12.24, 6.13.12, 6.14.3. Check the vendor advisory for mitigations.

References

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