CVE-2024-57951
Description
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 ]
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Linux kernel Affected 2 releases
| Version | Status | Fixed in |
|---|---|---|
| 6.13 | Affected | — |
| — | Affected | 4.20 |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.12.11-1 |
| sid | Fixed | 6.12.11-1 |
| forky | Fixed | 6.12.11-1 |
| bullseye | Fixed | 5.10.234-1 |
| bookworm | Fixed | 6.1.128-1 |
References
- https://git.kernel.org/stable/c/14984139f1f2768883332965db566ef26db609e7
- https://git.kernel.org/stable/c/15b453db41d36184cf0ccc21e7df624014ab6a1a
- https://git.kernel.org/stable/c/2f8dea1692eef2b7ba6a256246ed82c365fdc686
- https://git.kernel.org/stable/c/38492f6ee883c7b1d33338bf531a62cff69b4b28
- https://git.kernel.org/stable/c/3d41dbf82e10c44e53ea602398ab002baec27e75
- https://git.kernel.org/stable/c/95e4f62df23f4df1ce6ef897d44b8e23c260921a
- https://git.kernel.org/stable/c/a5cbbea145b400e40540c34816d16d36e0374fbc
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
- https://www.suse.com/security/cve/CVE-2024-57951.html
- https://security-tracker.debian.org/tracker/CVE-2024-57951
CWEs
CWE-416
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.