CVE-2025-21850

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Source
https://nvd.nist.gov/vuln/detail/CVE-2025-21850
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21850.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-21850
Downstream
Related
Published
2025-03-12T09:42:05.761Z
Modified
2025-11-20T08:04:34.333581Z
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
nvmet: Fix crash when a namespace is disabled
Details

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

nvmet: Fix crash when a namespace is disabled

The namespace percpu counter protects pending I/O, and we can only safely diable the namespace once the counter drop to zero. Otherwise we end up with a crash when running blktests/nvme/058 (eg for loop transport):

[ 2352.930426] [ T53909] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN PTI [ 2352.930431] [ T53909] KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] [ 2352.930434] [ T53909] CPU: 3 UID: 0 PID: 53909 Comm: kworker/u16:5 Tainted: G W 6.13.0-rc6 #232 [ 2352.930438] [ T53909] Tainted: [W]=WARN [ 2352.930440] [ T53909] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014 [ 2352.930443] [ T53909] Workqueue: nvmet-wq nvmeloopexecutework [nvmeloop] [ 2352.930449] [ T53909] RIP: 0010:blkcgsetioprio+0x44/0x180

as the queue is already torn down when calling submit_bio();

So we need to init the percpu counter in nvmetnsenable(), and wait for it to drop to zero in nvmetnsdisable() to avoid having I/O pending after the namespace has been disabled.

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
74d16965d7ac378d28ebd833ae6d6a097186a4ec
Fixed
cc0607594f6813342b27c752c6fb6f6eb9980cb5
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
74d16965d7ac378d28ebd833ae6d6a097186a4ec
Fixed
4082326807072b71496501b6a0c55ffe8d5092a5

Affected versions

v6.*

v6.13
v6.13-rc2
v6.13-rc3
v6.13-rc4
v6.13-rc5
v6.13-rc6
v6.13-rc7
v6.13.1
v6.13.2
v6.13.3
v6.13.4

Database specific

vanir_signatures

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]

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.13.5