What’s Vulnerable › Vulnerabilities

CVE-2023-53457: FS: JFS: Fix null-ptr-deref Read in txBegin

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-01 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: FS: JFS: Fix null-ptr-deref Read in txBegin Syzkaller reported an issue where txBegin may be called on a superblock in a read-only mounted filesystem which leads to NULL pointer deref. This could be solved by checking if the filesystem is read-only before calling txBegin, and returning with appropiate error code.

Affected products

• Linux kernel: from 2.6.12.1 before 4.14.324; from 4.15 before 4.19.293; from 4.20 before 5.4.255; from 5.5 before 5.10.192; from 5.11 before 5.15.123; from 5.16 before 6.1.42 — fixed in 4.14.324, 4.19.293, 5.10.192, 5.15.123, 5.4.255, 6.1.42

How to fix

Upgrade to a fixed version: Linux kernel 4.14.324, 4.19.293, 5.10.192, 5.15.123. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1b4c144767736221cad92c132f72b3c6ed06a0ea
• https://git.kernel.org/stable/c/2a3f20efe6c901d4c0871cfd1d8c65e2ade71fc1
• https://git.kernel.org/stable/c/3e5eb6c5ecd8ddb9cfea751cf30f9e23eac97ca3
• https://git.kernel.org/stable/c/3e94d0d378d2754b26fc54b429582553f7b53e15
• https://git.kernel.org/stable/c/47cfdc338d674d38f4b2f22b7612cc6a2763ba27
• https://git.kernel.org/stable/c/a7225e9e09519deb7e0c42eb6070029cc456e84d
• https://git.kernel.org/stable/c/a7d17d6bd7cd4f6940b335ea7a6fce5b6d22adc2
• https://git.kernel.org/stable/c/fd2db13fb72ff18c633a48229589d42ceb89d1f8

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