CVE-2025-21876

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Source
https://nvd.nist.gov/vuln/detail/CVE-2025-21876
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21876.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-21876
Related
Published
2025-03-27T15:15:55Z
Modified
2025-03-27T20:57:02.293748Z
Downstream
Summary
[none]
Details

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

iommu/vt-d: Fix suspicious RCU usage

Commit <d74169ceb0d2> ("iommu/vt-d: Allocate DMAR fault interrupts locally") moved the call to enabledrhdfaulthandling() to a code path that does not hold any lock while traversing the drhd list. Fix it by ensuring the dmarglobal_lock lock is held when traversing the drhd list.

Without this fix, the following warning is triggered: ============================= WARNING: suspicious RCU usage 6.14.0-rc3 #55 Not tainted

drivers/iommu/intel/dmar.c:2046 RCU-list traversed in non-reader section!! other info that might help us debug this: rcuscheduleractive = 1, debuglocks = 1 2 locks held by cpuhp/1/23: #0: ffffffff84a67c50 (cpuhotpluglock){++++}-{0:0}, at: cpuhpthreadfun+0x87/0x2c0 #1: ffffffff84a6a380 (cpuhpstate-up){+.+.}-{0:0}, at: cpuhpthreadfun+0x87/0x2c0 stack backtrace: CPU: 1 UID: 0 PID: 23 Comm: cpuhp/1 Not tainted 6.14.0-rc3 #55 Call Trace: <TASK> dumpstacklvl+0xb7/0xd0 lockdeprcususpicious+0x159/0x1f0 ? _pfxenabledrhdfaulthandling+0x10/0x10 enabledrhdfaulthandling+0x151/0x180 cpuhpinvokecallback+0x1df/0x990 cpuhpthreadfun+0x1ea/0x2c0 smpbootthreadfn+0x1f5/0x2e0 ? _pfxsmpbootthreadfn+0x10/0x10 kthread+0x12a/0x2d0 ? _pfxkthread+0x10/0x10 retfromfork+0x4a/0x60 ? _pfxkthread+0x10/0x10 retfromfork_asm+0x1a/0x30 </TASK>

Holding the lock in enabledrhdfaulthandling() triggers a lockdep splat about a possible deadlock between dmargloballock and cpuhotpluglock. This is avoided by not holding dmargloballock when calling iommudevice_register(), which initiates the device probe process.

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
6.12.19-1

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
6.1.112-1
6.1.115-1
6.1.119-1
6.1.123-1
6.1.124-1
6.1.128-1
6.1.129-1
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
6.8.11-1
6.8.12-1~bpo12+1
6.8.12-1
6.9.2-1~exp1
6.9.7-1~bpo12+1
6.9.7-1
6.9.8-1
6.9.9-1
6.9.10-1~bpo12+1
6.9.10-1
6.9.11-1
6.9.12-1
6.10-1~exp1
6.10.1-1~exp1
6.10.3-1
6.10.4-1
6.10.6-1~bpo12+1
6.10.6-1
6.10.7-1
6.10.9-1
6.10.11-1~bpo12+1
6.10.11-1
6.10.12-1
6.11~rc4-1~exp1
6.11~rc5-1~exp1
6.11-1~exp1
6.11.2-1
6.11.4-1
6.11.5-1~bpo12+1
6.11.5-1
6.11.6-1
6.11.7-1
6.11.9-1
6.11.10-1~bpo12+1
6.11.10-1
6.12~rc6-1~exp1
6.12.3-1
6.12.5-1
6.12.6-1
6.12.8-1
6.12.9-1~bpo12+1
6.12.9-1
6.12.9-1+alpha
6.12.10-1
6.12.11-1
6.12.11-1+alpha
6.12.11-1+alpha.1
6.12.12-1~bpo12+1
6.12.12-1
6.12.13-1
6.12.15-1
6.12.16-1
6.12.17-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}