What’s Vulnerable › Vulnerabilities

CVE-2024-36922: wifi: iwlwifi: read txq->read_ptr under lock

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-30 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: read txq->read_ptr under lock If we read txq->read_ptr without lock, we can read the same value twice, then obtain the lock, and reclaim from there to two different places, but crucially reclaim the same entry twice, resulting in the WARN_ONCE() a little later. Fix that by reading txq->read_ptr under lock.

Affected products

• Linux kernel: before 6.6.31; from 6.7 before 6.8.10; 6.9-rc1 — fixed in 6.6.31, 6.8.10

How to fix

Upgrade to a fixed version: Linux kernel 6.6.31, 6.8.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/43d07103df670484cdd26f9588eabef80f69db89
• https://git.kernel.org/stable/c/aab7b39fcac5f6165f6434bcbb56bb7865d4ad2b
• https://git.kernel.org/stable/c/b83db8e756dec68a950ed2f056248b1704b3deaa
• https://git.kernel.org/stable/c/c2ace6300600c634553657785dfe5ea0ed688ac2
• https://git.kernel.org/stable/c/f30e8af109818c9db08cbcc46eb9713fe4b530ba
• https://git.kernel.org/stable/c/43d07103df670484cdd26f9588eabef80f69db89
• https://git.kernel.org/stable/c/b83db8e756dec68a950ed2f056248b1704b3deaa
• https://git.kernel.org/stable/c/c2ace6300600c634553657785dfe5ea0ed688ac2
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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