CVE-2023-53091: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: update s_journal_inum if it changes after journal replay When mounting a crafted ext4 image, s_journal_inum may change after journal replay, which is obviously unreasonable because we have successfully loaded and replayed the journal through the old s_journal_inum. And the new s_journal_inum bypasses some of the checks in ext4_get_journal(), which may trigger a null pointer dereference problem. So if s_journal_inum changes after the journal replay, we ignore the change, and rewrite the current journal_inum to the superblock.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 5.15.104
linux	linux_kernel	5.16 — 6.1.21
linux	linux_kernel	6.2 — 6.2.8

References

Advisories & Patches

https://git.kernel.org/stable/c/3039d8b8692408438a618fac2776b629852663c3 https://git.kernel.org/stable/c/499fef2030fb754c68b1c7cb3a799a3bc1d0d925 https://git.kernel.org/stable/c/70e66bdeae4d0f7c8e87762f425b68aedd5e8955 https://git.kernel.org/stable/c/ee0c5277d4fab920bd31345c49e193ecede9ecef

Frequently Asked Questions

What is CVE-2023-53091? +

In the Linux kernel, the following vulnerability has been resolved: ext4: update s_journal_inum if it changes after journal replay When mounting a crafted ext4 image, s_journal_inum may change after journal replay, which is obviously unreasonable because we have successfully loaded and replayed the journal through the old s_journal_inum. And the new s_journal_inum bypasses some of the checks in ext4_get_journal(), which may trigger a null pointer dereference problem. So if s_journal_inum changes after the journal replay, we ignore the change, and rewrite the current journal_inum to the superblock. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-53091? +

CVE-2023-53091 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2023-53091? +

CVE-2023-53091 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-53091? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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