PT-2025-27978 · Linux+5 · Linux Kernel+5
CVE-2025-38203
·
Published
2025-07-04
·
Updated
2026-05-26
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions:
Linux kernel versions prior to 6.13.0-rc6
Description:
A concurrency bug in the
fs/jfs module results in a null pointer dereference. The issue is closely related to a previously fixed problem, but the accepted patch is still susceptible to a null pointer dereference under some interleavings. The bug manifests when JFS SBI(ipbmap->i sb)->bmap is set to NULL in dbFreeBits and then dereferenced in jfs ioc trim. This bug is triggereable from a syz-program and can cause a general protection fault.Recommendations:
To resolve the issue, update the Linux kernel to a version that includes the fix for the null pointer dereference in
jfs ioc trim. As a temporary workaround, consider disabling the jfs ioc trim function until a patch is available. Restrict access to the fs/jfs module to minimize the risk of exploitation. Avoid using the JFS SBI(ipbmap->i sb)->bmap variable in the affected code until the issue is resolved.Exploit
Fix
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Astra Linux
Debian
Linuxmint
Linux Kernel
Suse
Ubuntu