In the Linux kernel, the following vulnerability has been resolved:
rxrpc: Fix call timer start racing with call destruction
The rxrpc_call struct has a timer used to handle various timed events relating to a call. This timer can get started from the packet input routines that are run in softirq mode with just the RCU read lock held. Unfortunately, because only the RCU read lock is held - and neither ref or other lock is taken - the call can start getting destroyed at the same time a packet comes in addressed to that call. This causes the timer - which was already stopped - to get restarted. Later, the timer dispatch code may then oops if the timer got deallocated first.
Fix this by trying to take a ref on the rxrpc_call struct and, if successful, passing that ref along to the timer. If the timer was already running, the ref is discarded.
The timer completion routine can then pass the ref along to the call's work item when it queues it. If the timer or work item where already queued/running, the extra ref is discarded.
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perf-debuginfoUpgrade perf-debuginfoUpgrade perfUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade kernel-tools-develUpgrade kernel-headersUpgrade kernel-debuginfoUpgrade kernel-develUpgrade bpftool-debuginfoUpgrade kernel-livepatch-5.10.112-108.499Upgrade kernel-tools-debuginfoUpgrade python-perfUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool | May 22, 2025 | Feb 26, 2025 |
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linuxUpgrade linux-azure-5.15Upgrade linux-intel-iotgUpgrade linux-ibmUpgrade linux-intel-iotg-5.15Upgrade linux-gcpUpgrade linux-kvmUpgrade linux-oracleUpgrade linux-lowlatencyUpgrade linux-raspiUpgrade linux-realtimeUpgrade linux-gkeUpgrade linux-awsUpgrade linux-lowlatency-hwe-5.15Upgrade linux-hwe-5.15Upgrade linux-azure | Mar 19, 2025 | Feb 26, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Feb 26, 2025 |
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