CVE-2024-49926: Linux kernel · rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 15:04 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 21 Oct 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
AI-suggested
A fix has been implemented in the Linux kernel to address this issue by correcting the CPU number usage in the rcu_tasks_need_gpcb() function. Users should update to a kernel version that includes this fix. Since this is a kernel-level issue, applying the official kernel patch or upgrading to a fixed kernel release is the recommended mitigation.
Description
A vulnerability in the Linux kernel's rcu-tasks subsystem caused a system panic due to accessing a non-existent per-CPU variable when kernels are built with CONFIG_FORCE_NR_CPUS=y. This issue arises because nr_cpu_ids is defined as NR_CPUS instead of the actual number of possible CPUs, leading to a page fault and kernel panic. The fix involves using the maximum possible CPU number rather than nr_cpu_ids for certain configurations to prevent this panic.
References
- git.kernel.org/stable/c/a89f6e90e64ecadd19f32bb8128d22b518bd656c (opens in a new tab)
- git.kernel.org/stable/c/b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf (opens in a new tab)
- git.kernel.org/stable/c/3104bddc666ff64b90491868bbc4c7ebdd90aedf (opens in a new tab)
- git.kernel.org/stable/c/05095271a4fb0f6497121a057f9a2edf386d5d96 (opens in a new tab)
- git.kernel.org/stable/c/fd70e9f1d85f5323096ad313ba73f5fe3d15ea41 (opens in a new tab)