CVE-2023-53681: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: bcache: Fix __bch_btree_node_alloc to make the failure behavior consistent In some specific situations, the return value of __bch_btree_node_alloc may be NULL. This may lead to a potential NULL pointer dereference in caller function like a calling chain : btree_split->bch_btree_node_alloc->__bch_btree_node_alloc. Fix it by initializing the return value in __bch_btree_node_alloc.

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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	3.10 — 4.19.291
linux	linux_kernel	4.20 — 5.4.253
linux	linux_kernel	5.5 — 5.10.188
linux	linux_kernel	5.11 — 5.15.121
linux	linux_kernel	5.16 — 6.1.39
linux	linux_kernel	6.2 — 6.4.4

References

Advisories & Patches

https://git.kernel.org/stable/c/4514847aee18d9391a0cf3aad75d3567c72795a4 https://git.kernel.org/stable/c/587b4e8bb5dac682f09280ab35db4632b29d5ac4 https://git.kernel.org/stable/c/7ecea5ce3dc17339c280c75b58ac93d8c8620d9f https://git.kernel.org/stable/c/80fca8a10b604afad6c14213fdfd816c4eda3ee4 https://git.kernel.org/stable/c/a4405f6ee03323410d7b10966fd67b35f71b1944 https://git.kernel.org/stable/c/b070f29a61436f6f8a2e3abc7ea4f4be81695198 https://git.kernel.org/stable/c/f67b0e3081f2a24170280a33ac66f6b112083c03

Frequently Asked Questions

What is CVE-2023-53681? +

In the Linux kernel, the following vulnerability has been resolved: bcache: Fix __bch_btree_node_alloc to make the failure behavior consistent In some specific situations, the return value of __bch_btree_node_alloc may be NULL. This may lead to a potential NULL pointer dereference in caller function like a calling chain : btree_split->bch_btree_node_alloc->__bch_btree_node_alloc. Fix it by initializing the return value in __bch_btree_node_alloc. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-53681? +

CVE-2023-53681 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-2023-53681? +

CVE-2023-53681 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-2023-53681? +

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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CVE-2023-53681