CVE-2024-31076 Affecting kernel-cross-headers package, versions <0:4.18.0-553.16.1.el8_10
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published22 Aug 2024
- disclosed21 Jun 2024
Introduced: 21 Jun 2024
CVE-2024-31076 (opens in a new tab)How to fix?
Upgrade Rocky-Linux:8 kernel-cross-headers to version 0:4.18.0-553.16.1.el8_10 or higher.
This issue was patched in RLSA-2024:5101.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-cross-headers package and not the kernel-cross-headers package as distributed by Rocky-Linux.
See How to fix? for Rocky-Linux:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
genirq/cpuhotplug, x86/vector: Prevent vector leak during CPU offline
The absence of IRQD_MOVE_PCNTXT prevents immediate effectiveness of interrupt affinity reconfiguration via procfs. Instead, the change is deferred until the next instance of the interrupt being triggered on the original CPU.
When the interrupt next triggers on the original CPU, the new affinity is enforced within __irq_move_irq(). A vector is allocated from the new CPU, but the old vector on the original CPU remains and is not immediately reclaimed. Instead, apicd->move_in_progress is flagged, and the reclaiming process is delayed until the next trigger of the interrupt on the new CPU.
Upon the subsequent triggering of the interrupt on the new CPU, irq_complete_move() adds a task to the old CPU's vector_cleanup list if it remains online. Subsequently, the timer on the old CPU iterates over its vector_cleanup list, reclaiming old vectors.
However, a rare scenario arises if the old CPU is outgoing before the interrupt triggers again on the new CPU.
In that case irq_force_complete_move() is not invoked on the outgoing CPU to reclaim the old apicd->prev_vector because the interrupt isn't currently affine to the outgoing CPU, and irq_needs_fixup() returns false. Even though __vector_schedule_cleanup() is later called on the new CPU, it doesn't reclaim apicd->prev_vector; instead, it simply resets both apicd->move_in_progress and apicd->prev_vector to 0.
As a result, the vector remains unreclaimed in vector_matrix, leading to a CPU vector leak.
To address this issue, move the invocation of irq_force_complete_move() before the irq_needs_fixup() call to reclaim apicd->prev_vector, if the interrupt is currently or used to be affine to the outgoing CPU.
Additionally, reclaim the vector in __vector_schedule_cleanup() as well, following a warning message, although theoretically it should never see apicd->move_in_progress with apicd->prev_cpu pointing to an offline CPU.
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-31076
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://git.kernel.org/stable/c/59f86a2908380d09cdc726461c0fbb8d8579c99f
- https://git.kernel.org/stable/c/6752dfcfff3ac3e16625ebd3f0ad9630900e7e76
- https://git.kernel.org/stable/c/9eeda3e0071a329af1eba15f4e57dc39576bb420
- https://git.kernel.org/stable/c/a40209d355afe4ed6d533507838c9e5cd70a76d8
- https://git.kernel.org/stable/c/a6c11c0a5235fb144a65e0cb2ffd360ddc1f6c32
- https://git.kernel.org/stable/c/e9c96d01d520498b169ce734a8ad1142bef86a30
- https://git.kernel.org/stable/c/ebfb16fc057a016abb46a9720a54abf0d4f6abe1
- https://git.kernel.org/stable/c/f5f4675960609d8c5ee95f027fbf6ce380f98372