hrtimers: Handle CPU state correctly on hotplug
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 4 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: hrtimers: Handle CPU state correctly on hotplug Consider a scenario where a CPU transitions from CPUHP_ONLINE to halfway through a CPU hotunplug down to CPUHP_HRTIMERS_PREPARE, and then back to CPUHP_ONLINE: Since hrtimers_prepare_cpu() does not run, cpu_base.hres_active remains set to 1 throughout. However, during a CPU unplug operation, the tick and the clockevents are shut down at CPUHP_AP_TICK_DYING. On return to the online state, for instance CFS incorrectly assumes that the hrtick is already active, and the chance of the clockevent device to transition to oneshot mode is also lost forever for the CPU, unless it goes back to a lower state than CPUHP_HRTIMERS_PREPARE once. This round-trip reveals another issue; cpu_base.online is not set to 1 after the transition, which appears as a WARN_ON_ONCE in enqueue_hrtimer(). Aside of that, the bulk of the per CPU state is not reset either, which means there are dangling pointers in the worst case. Address this by adding a corresponding startup() callback, which resets the stale per CPU state and sets the online flag. [ tglx: Make the new callback unconditionally available, remove the online modification in the prepare() callback and clear the remaining state in the starting callback instead of the prepare callback ]
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- 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 | 5.4.264 to before 5.4.290; 5.10.204 to before 5.10.234; 5.15.143 to before 5.15.177; 6.1.68 to before 6.1.127; 6.6.7 to before 6.6.74; 4.19.302 to before 4.20 | 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 4.20 | Patch available | CNA |
| Linux | Linux | 6.7 and later | 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 6.12.11, 6.13 | Patch available | CNA |
- Linux VendorLinux Affected 5.4.264 to before 5.4.290; 5.10.204 to before 5.10.234; 5.15.143 to before 5.15.177; 6.1.68 to before 6.1.127; 6.6.7 to before 6.6.74; 4.19.302 to before 4.20 Fixed in 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 4.20 Patch available CNA
- Linux VendorLinux Affected 6.7 and later Fixed in 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 6.12.11, 6.13 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.19.302 to before 4.20; 5.4.264 to before 5.4.290; 5.10.204 to before 5.10.234; 5.15.143 to before 5.15.177; 6.1.68 to before 6.1.127; 6.6.7 to before 6.6.74; 6.7 to before 6.12.11 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:* | 6.13 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:* | 6.13 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:* | 6.13 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:* | 6.13 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:* | 6.13 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:* | 6.13 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.13:rc7:*:*:*:*:*:* | 6.13 rc7 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.19.302 to before 4.20; 5.4.264 to before 5.4.290; 5.10.204 to before 5.10.234; 5.15.143 to before 5.15.177; 6.1.68 to before 6.1.127; 6.6.7 to before 6.6.74; 6.7 to before 6.12.11 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:* Versions 6.13 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:* Versions 6.13 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:* Versions 6.13 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:* Versions 6.13 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:* Versions 6.13 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:* Versions 6.13 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.13:rc7:*:*:*:*:*:* Versions 6.13 rc7 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 4.20
- Fix · CNA Linux (Linux) Fixed in 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 6.12.11, 6.13
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix planned: Will not fix |
Not affected: 1 product
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2024-57951
- 2026-10-03 Alias added: GHSA-5j5f-9wh9-hfj9
References
Patch 7
- https://git.kernel.org/stable/c/95e4f62df23f4df1ce6ef897d44b8e23c260921a
- https://git.kernel.org/stable/c/14984139f1f2768883332965db566ef26db609e7
- https://git.kernel.org/stable/c/15b453db41d36184cf0ccc21e7df624014ab6a1a
- https://git.kernel.org/stable/c/3d41dbf82e10c44e53ea602398ab002baec27e75
- https://git.kernel.org/stable/c/a5cbbea145b400e40540c34816d16d36e0374fbc
- https://git.kernel.org/stable/c/38492f6ee883c7b1d33338bf531a62cff69b4b28
- https://git.kernel.org/stable/c/2f8dea1692eef2b7ba6a256246ed82c365fdc686
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Sources
- CVE-2024-57951 · CVE Program
- CVE-2024-57951 · NVD
- FIRST EPSS
- GHSA-5j5f-9wh9-hfj9 · GitHub Advisory Database · CC BY 4.0
- CVE-2024-57951 · Red Hat security data · CC BY 4.0
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