CVE - CVE-2024-57951

CVE-ID
CVE-2024-57951	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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 ]
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/14984139f1f2768883332965db566ef26db609e7 URL:https://git.kernel.org/stable/c/14984139f1f2768883332965db566ef26db609e7 MISC:https://git.kernel.org/stable/c/15b453db41d36184cf0ccc21e7df624014ab6a1a URL:https://git.kernel.org/stable/c/15b453db41d36184cf0ccc21e7df624014ab6a1a MISC:https://git.kernel.org/stable/c/2f8dea1692eef2b7ba6a256246ed82c365fdc686 URL:https://git.kernel.org/stable/c/2f8dea1692eef2b7ba6a256246ed82c365fdc686 MISC:https://git.kernel.org/stable/c/38492f6ee883c7b1d33338bf531a62cff69b4b28 URL:https://git.kernel.org/stable/c/38492f6ee883c7b1d33338bf531a62cff69b4b28 MISC:https://git.kernel.org/stable/c/3d41dbf82e10c44e53ea602398ab002baec27e75 URL:https://git.kernel.org/stable/c/3d41dbf82e10c44e53ea602398ab002baec27e75 MISC:https://git.kernel.org/stable/c/95e4f62df23f4df1ce6ef897d44b8e23c260921a URL:https://git.kernel.org/stable/c/95e4f62df23f4df1ce6ef897d44b8e23c260921a MISC:https://git.kernel.org/stable/c/a5cbbea145b400e40540c34816d16d36e0374fbc URL:https://git.kernel.org/stable/c/a5cbbea145b400e40540c34816d16d36e0374fbc
Assigning CNA
kernel.org
Date Record Created
20250119	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250119)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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