What’s Vulnerable › Vulnerabilities

CVE-2022-49809: net/x25: Fix skb leak in x25_lapb_receive_frame()

• 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: 2025-05-01 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix skb leak in x25_lapb_receive_frame() x25_lapb_receive_frame() using skb_copy() to get a private copy of skb, the new skb should be freed in the undersized/fragmented skb error handling path. Otherwise there is a memory leak.

Affected products

• Linux kernel: from 3.0.72 before 3.1; from 3.1.1 before 4.9.334; from 4.10 before 4.14.300; from 4.15 before 4.19.267; from 4.20 before 5.4.225; from 5.5 before 5.10.156 — fixed in 3.1, 4.14.300, 4.19.267, 4.9.334, 5.10.156, 5.15.80

How to fix

Upgrade to a fixed version: Linux kernel 3.1, 4.14.300, 4.19.267, 4.9.334. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0ef17d966445358a55c5f4ccf2c73cca3e39192b
• https://git.kernel.org/stable/c/2929cceb2fcf0ded7182562e4888afafece82cce
• https://git.kernel.org/stable/c/2d675be16a461310d738d93f9f1a00da62055c5a
• https://git.kernel.org/stable/c/9f00da9c866d506998bf0a3f699ec900730472da
• https://git.kernel.org/stable/c/c8baf1fc248b2e88642f094fea9509a9bf98c5bb
• https://git.kernel.org/stable/c/dfcfbe4f2e4b2c81cff4e79b48502d97fda73118
• https://git.kernel.org/stable/c/e109b41870db995cae25dfaf0cc3922f9028b1a1
• https://git.kernel.org/stable/c/fda0ba7c84b46d10947c687320804b9de149a921

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