CVE-2024-49926

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Source
https://cve.org/CVERecord?id=CVE-2024-49926
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49926.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-49926
Downstream
Related
Published
2024-10-21T18:01:50.405Z
Modified
2026-03-20T12:39:27.799568Z
Summary
rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()
Details

In the Linux kernel, the following vulnerability has been resolved:

rcu-tasks: Fix access non-existent percpu rtpcp variable in rcutasksneed_gpcb()

For kernels built with CONFIGFORCENRCPUS=y, the nrcpuids is defined as NRCPUS instead of the number of possible cpus, this will cause the following system panic:

smpboot: Allowing 4 CPUs, 0 hotplug CPUs ... setuppercpu: NRCPUS:512 nrcpumaskbits:512 nrcpuids:512 nrnodeids:1 ... BUG: unable to handle page fault for address: ffffffff9911c8c8 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 0 PID: 15 Comm: rcutaskstrace Tainted: G W 6.6.21 #1 5dc7acf91a5e8e9ac9dcfc35bee0245691283ea6 RIP: 0010:rcutasksneed_gpcb+0x25d/0x2c0 RSP: 0018:ffffa371c00a3e60 EFLAGS: 00010082 CR2: ffffffff9911c8c8 CR3: 000000040fa20005 CR4: 00000000001706f0 Call Trace: <TASK> ? __die+0x23/0x80 ? pagefaultoops+0xa4/0x180 ? excpagefault+0x152/0x180 ? asmexcpagefault+0x26/0x40 ? rcutasksneedgpcb+0x25d/0x2c0 ? __pfxrcutaskskthread+0x40/0x40 rcutasksonegp+0x69/0x180 rcutaskskthread+0x94/0xc0 kthread+0xe8/0x140 ? __pfxkthread+0x40/0x40 retfrom_fork+0x34/0x80 ? __pfxkthread+0x40/0x40 retfromforkasm+0x1b/0x80 </TASK>

Considering that there may be holes in the CPU numbers, use the maximum possible cpu number, instead of nrcpuids, for configuring enqueue and dequeue limits.

[ neeraj.upadhyay: Fix htmldocs build error reported by Stephen Rothwell ]

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49926.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
8610b65680390a103b58f46282a1b05f7eebbba4
Fixed
b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf
Fixed
3104bddc666ff64b90491868bbc4c7ebdd90aedf
Fixed
05095271a4fb0f6497121a057f9a2edf386d5d96
Fixed
fd70e9f1d85f5323096ad313ba73f5fe3d15ea41

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49926.json"