rxrpc: Fix call timer start racing with call destruction
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.15 and later | 5.10.110, 5.15.33, 5.16.19, 5.17.2, 5.18 | Patch available | CNA |
- Linux VendorLinux Affected 4.15 and later Fixed in 5.10.110, 5.15.33, 5.16.19, 5.17.2, 5.18 Patch available CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.15.1 to before 5.10.110; 5.11 to before 5.15.33; 5.16 to before 5.16.19; 5.17 to before 5.17.2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.15:-:*:*:*:*:*:* | 4.15 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.15:rc2:*:*:*:*:*:* | 4.15 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.15:rc3:*:*:*:*:*:* | 4.15 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.15:rc4:*:*:*:*:*:* | 4.15 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.15:rc5:*:*:*:*:*:* | 4.15 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.15:rc6:*:*:*:*:*:* | 4.15 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.15:rc7:*:*:*:*:*:* | 4.15 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.15:rc8:*:*:*:*:*:* | 4.15 rc8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.15:rc9:*:*:*:*:*:* | 4.15 rc9 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.15.1 to before 5.10.110; 5.11 to before 5.15.33; 5.16 to before 5.16.19; 5.17 to before 5.17.2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.15:-:*:*:*:*:*:* Versions 4.15 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.15:rc2:*:*:*:*:*:* Versions 4.15 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.15:rc3:*:*:*:*:*:* Versions 4.15 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.15:rc4:*:*:*:*:*:* Versions 4.15 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.15:rc5:*:*:*:*:*:* Versions 4.15 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.15:rc6:*:*:*:*:*:* Versions 4.15 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.15:rc7:*:*:*:*:*:* Versions 4.15 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.15:rc8:*:*:*:*:*:* Versions 4.15 rc8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.15:rc9:*:*:*:*:*:* Versions 4.15 rc9 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.110, 5.15.33, 5.16.19, 5.17.2, 5.18
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Not affected: 4 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2022-49149
- 2026-10-03 Alias added: GHSA-g36j-w8h6-jr97
- 2026-10-16 CISA SSVC decision points changed
References
Patch 5
- https://git.kernel.org/stable/c/051360e51341cd17738d82c15a8226010c7cb7f6
- https://git.kernel.org/stable/c/8cbf4ae7a2833767d63114573e5f9a45740cc975
- https://git.kernel.org/stable/c/54df5a37f1d951ed27fd47bf9b15a42279582110
- https://git.kernel.org/stable/c/5e3c11144e557a9dbf9a2f6abe444689ef9d8aae
- https://git.kernel.org/stable/c/4a7f62f91933c8ae5308f9127fd8ea48188b6bc3
More Linux Kernel vulnerabilities
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- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2022-49149 · CVE Program
- CVE-2022-49149 · NVD
- FIRST EPSS
- GHSA-g36j-w8h6-jr97 · GitHub Advisory Database · CC BY 4.0
- CVE-2022-49149 · Red Hat security data · CC BY 4.0
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