CVE-2025-21850: nvmet: Fix crash when a namespace is disabled
Description
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 nvme_loop_execute_work [nvme_loop]
[ 2352.930449] [ T53909] RIP: 0010:blkcg_set_ioprio+0x44/0x180
as the queue is already torn down when calling submit_bio();
So we need to init the percpu counter in nvmet_ns_enable(), and
wait for it to drop to zero in nvmet_ns_disable() to avoid having
I/O pending after the namespace has been disabled.
Classification
CVE ID: CVE-2025-21850
Affected Products
Vendor: Linux, Linux
Product: Linux, Linux
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.02% (probability of being exploited)
EPSS Percentile: 1.48% (scored less or equal to compared to others)
EPSS Date: 2025-04-10 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-21850https://git.kernel.org/stable/c/cc0607594f6813342b27c752c6fb6f6eb9980cb5
https://git.kernel.org/stable/c/4082326807072b71496501b6a0c55ffe8d5092a5