CVE-2024-36888

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Source
https://nvd.nist.gov/vuln/detail/CVE-2024-36888
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-36888.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-36888
Related
Published
2024-05-30T16:15:12Z
Modified
2024-09-18T03:26:23.723626Z
Summary
[none]
Details

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

workqueue: Fix selection of wakecpu in kickpool()

With cpupossiblemask=0-63 and cpuonlinemask=0-7 the following kernel oops was observed:

smp: Bringing up secondary CPUs ... smp: Brought up 1 node, 8 CPUs Unable to handle kernel pointer dereference in virtual kernel address space Failing address: 0000000000000000 TEID: 0000000000000803 [..] Call Trace: archvcpuispreempted+0x12/0x80 selectidlesibling+0x42/0x560 selecttaskrqfair+0x29a/0x3b0 trytowakeup+0x38e/0x6e0 kickpool+0xa4/0x198 _queuework.part.0+0x2bc/0x3a8 calltimerfn+0x36/0x160 _runtimers+0x1e2/0x328 _runtimerbase+0x5a/0x88 runtimersoftirq+0x40/0x78 _dosoftirq+0x118/0x388 irqexitrcu+0xc0/0xd8 doextirq+0xae/0x168 extinthandler+0xbe/0xf0 pswidleexit+0x0/0xc defaultidlecall+0x3c/0x110 doidle+0xd4/0x158 cpustartupentry+0x40/0x48 restinit+0xc6/0xc8 startkernel+0x3c4/0x5e0 startup_continue+0x3c/0x50

The crash is caused by calling archvcpuispreempted() for an offline CPU. To avoid this, select the cpu with cpumaskanyanddistribute() to mask _podcpumask with cpuonlinemask. In case no cpu is left in the pool, skip the assignment.

tj: This doesn't fully fix the bug as CPUs can still go down between picking the target CPU and the wake call. Fixing that likely requires adding cpu_online() test to either the sched or s390 arch code. However, regardless of how that is fixed, workqueue shouldn't be picking a CPU which isn't online as that would result in unpredictable and worse behavior.

References

Affected packages

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.8.11-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1
6.1.82-1
6.1.85-1
6.1.90-1~bpo11+1
6.1.90-1
6.1.94-1~bpo11+1
6.1.94-1
6.1.98-1
6.1.99-1
6.1.106-1
6.1.106-2
6.1.106-3
6.3.1-1~exp1
6.3.2-1~exp1
6.3.4-1~exp1
6.3.5-1~exp1
6.3.7-1~bpo12+1
6.3.7-1
6.3.11-1
6.4~rc6-1~exp1
6.4~rc7-1~exp1
6.4.1-1~exp1
6.4.4-1~bpo12+1
6.4.4-1
6.4.4-2
6.4.4-3~bpo12+1
6.4.4-3
6.4.11-1
6.4.13-1
6.5~rc4-1~exp1
6.5~rc6-1~exp1
6.5~rc7-1~exp1
6.5.1-1~exp1
6.5.3-1~bpo12+1
6.5.3-1
6.5.6-1
6.5.8-1
6.5.10-1~bpo12+1
6.5.10-1
6.5.13-1
6.6.3-1~exp1
6.6.4-1~exp1
6.6.7-1~exp1
6.6.8-1
6.6.9-1
6.6.11-1
6.6.13-1~bpo12+1
6.6.13-1
6.6.15-1
6.6.15-2
6.7-1~exp1
6.7.1-1~exp1
6.7.4-1~exp1
6.7.7-1
6.7.9-1
6.7.9-2
6.7.12-1~bpo12+1
6.7.12-1
6.8.9-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}