PT-2025-49751 · Linux+1 · Linux Kernel+1
Published
2025-12-09
·
Updated
2026-03-24
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CVE-2023-53860
None
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Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 6.6.0-rc1-g39956d2dcd81 #132
Description
The Linux kernel contained a flaw in the device mapper (dm) subsystem where it incorrectly attempted to queue I/O operations while under Read-Copy Update (RCU) protection. This occurred because the system assumed that requests marked with REQ NOWAIT were safe to submit under RCU read lock protection, which is not the case. REQ NOWAIT only indicates that the operation should not sleep while waiting for I/O, but does not guarantee that it won't potentially schedule tasks. A test case was provided demonstrating this issue, resulting in a kernel bug related to sleeping functions being called from an invalid context. The issue can lead to system instability. The vulnerable code involves the
dm submit bio function and related bio allocation and submission routines.Recommendations
Update to a version of the Linux kernel newer than 6.6.0-rc1-g39956d2dcd81 #132.
Exploit
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Related Identifiers
Affected Products
Linux Kernel
Red Hat