What’s Vulnerable › Vulnerabilities

CVE-2021-46949: sfc: farch: fix TX queue lookup in TX flush done handling

• 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: 2024-02-27 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: sfc: farch: fix TX queue lookup in TX flush done handling We're starting from a TXQ instance number ('qid'), not a TXQ type, so efx_get_tx_queue() is inappropriate (and could return NULL, leading to panics).

Affected products

• Linux kernel: from 5.10.0 before 5.10.36; from 5.11.0 before 5.11.20; from 5.12.0 before 5.12.3 — fixed in 5.10.36, 5.11.20, 5.12.3

How to fix

Upgrade to a fixed version: Linux kernel 5.10.36, 5.11.20, 5.12.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/5b1faa92289b53cad654123ed2bc8e10f6ddd4ac
• https://git.kernel.org/stable/c/98d91180748986bfb6dfb3e72765f3225719a647
• https://git.kernel.org/stable/c/a1570985ec04116cc665b760faf666a104154170
• https://git.kernel.org/stable/c/fb791572d6747ef385f628450f8d57cd132e6e5a
• https://git.kernel.org/stable/c/5b1faa92289b53cad654123ed2bc8e10f6ddd4ac
• https://git.kernel.org/stable/c/98d91180748986bfb6dfb3e72765f3225719a647
• https://git.kernel.org/stable/c/a1570985ec04116cc665b760faf666a104154170
• https://git.kernel.org/stable/c/fb791572d6747ef385f628450f8d57cd132e6e5a

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