What’s Vulnerable › Vulnerabilities

CVE-2021-47137: net: lantiq: fix memory corruption in RX ring

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-25 · updated 2026-08-04
• Weakness: CWE-770

Description

In the Linux kernel, the following vulnerability has been resolved: net: lantiq: fix memory corruption in RX ring In a situation where memory allocation or dma mapping fails, an invalid address is programmed into the descriptor. This can lead to memory corruption. If the memory allocation fails, DMA should reuse the previous skb and mapping and drop the packet. This patch also increments rx drop counter.

Affected products

• Linux kernel: from 4.20 before 5.4.124; from 5.5 before 5.10.42; from 5.11 before 5.12.9; 5.13-rc1, 5.13-rc2, 5.13-rc3 — fixed in 5.10.42, 5.12.9, 5.4.124

How to fix

Upgrade to a fixed version: Linux kernel 5.10.42, 5.12.9, 5.4.124. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/46dd4abced3cb2c912916f4a5353e0927db0c4a2
• https://git.kernel.org/stable/c/5ac72351655f8b033a2935646f53b7465c903418
• https://git.kernel.org/stable/c/8bb1077448d43a871ed667520763e3b9f9b7975d
• https://git.kernel.org/stable/c/c7718ee96dbc2f9c5fc3b578abdf296dd44b9c20
• https://git.kernel.org/stable/c/46dd4abced3cb2c912916f4a5353e0927db0c4a2
• https://git.kernel.org/stable/c/5ac72351655f8b033a2935646f53b7465c903418
• https://git.kernel.org/stable/c/8bb1077448d43a871ed667520763e3b9f9b7975d
• https://git.kernel.org/stable/c/c7718ee96dbc2f9c5fc3b578abdf296dd44b9c20

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