AZL-52959
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-52959.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-52959
- Upstream
- Published
- 2024-10-21T18:15:14Z
- Modified
- 2026-04-01T05:17:55.343668Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- CVE-2024-49926 affecting package kernel for versions less than 6.6.64.2-9
- 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.
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- References