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CVE-2022-48911: netfilter: nf_queue: fix possible use-after-free

• 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: 2024-08-22 · updated 2026-08-04
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_queue: fix possible use-after-free Eric Dumazet says: The sock_hold() side seems suspect, because there is no guarantee that sk_refcnt is not already 0. On failure, we cannot queue the packet and need to indicate an error. The packet will be dropped by the caller. v2: split skb prefetch hunk into separate change

Affected products

• Linux kernel: from 2.6.29 before 4.9.305; from 4.10 before 4.14.270; from 4.15 before 4.19.233; from 4.20 before 5.4.183; from 5.5 before 5.10.104; from 5.11 before 5.15.27 — fixed in 4.14.270, 4.19.233, 4.9.305, 5.10.104, 5.15.27, 5.16.13

How to fix

Upgrade to a fixed version: Linux kernel 4.14.270, 4.19.233, 4.9.305, 5.10.104. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/21b27b2baa27423286e9b8d3f0b194d587083d95
• https://git.kernel.org/stable/c/34dc4a6a7f261736ef7183868a5bddad31c7f9e3
• https://git.kernel.org/stable/c/43c25da41e3091b31a906651a43e80a2719aa1ff
• https://git.kernel.org/stable/c/4d05239203fa38ea8a6f31e228460da4cb17a71a
• https://git.kernel.org/stable/c/c3873070247d9e3c7a6b0cf9bf9b45e8018427b1
• https://git.kernel.org/stable/c/dcc3cb920bf7ba66ac5e9272293a9ba5f80917ee
• https://git.kernel.org/stable/c/dd648bd1b33a828f62befa696b206c688da0ec43
• https://git.kernel.org/stable/c/ef97921ccdc243170fcef857ba2a17cf697aece5

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