What’s Vulnerable › Vulnerabilities

CVE-2021-47539: rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle()

• 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: 2024-05-24 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle() Need to call rxrpc_put_peer() for bundle candidate before kfree() as it holds a ref to rxrpc_peer. [DH: v2: Changed to abstract out the bundle freeing code into a function]

Affected products

• Linux kernel: from 5.10 before 5.10.84; from 5.11 before 5.15.7; 5.16-rc1, 5.16-rc2, 5.16-rc3 — fixed in 5.10.84, 5.15.7

How to fix

Upgrade to a fixed version: Linux kernel 5.10.84, 5.15.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/35b40f724c4ef0f683d94dab3af9ab38261d782b
• https://git.kernel.org/stable/c/bc97458620e38961af9505cc060ad4cf5c9e4af7
• https://git.kernel.org/stable/c/ca77fba821351190777b236ce749d7c4d353102e
• https://git.kernel.org/stable/c/35b40f724c4ef0f683d94dab3af9ab38261d782b
• https://git.kernel.org/stable/c/bc97458620e38961af9505cc060ad4cf5c9e4af7
• https://git.kernel.org/stable/c/ca77fba821351190777b236ce749d7c4d353102e

Get alerted when CVE-2021-47539 or the next vulnerability affects your stack