CVE-2025-21809 — Improper Locking in Linux
Severity
5.5MEDIUMNVD
OSV7.8OSV7.1OSV5.9
EPSS
0.0%
top 87.73%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedFeb 27
Latest updateSep 3
Description
In the Linux kernel, the following vulnerability has been resolved:
rxrpc, afs: Fix peer hash locking vs RCU callback
In its address list, afs now retains pointers to and refs on one or more
rxrpc_peer objects. The address list is freed under RCU and at this time,
it puts the refs on those peers.
Now, when an rxrpc_peer object runs out of refs, it gets removed from the
peer hash table and, for that, rxrpc has to take a spinlock. However, it
is now being called from afs's RCU cleanup, which ta…
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6
Affected Packages5 packages
▶CVEListV5linux/linux72904d7b9bfbf2dd146254edea93958bc35bbbfe — 10ba5a3d57af20e494e0d979d1894260989235dd+4
Patches
🔴Vulnerability Details
14OSV▶
linux-aws-6.8, linux-gke, linux-gkeop, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-oracle, linux-oracle-6.8 vulnerabilities↗2025-07-22