Use After Free The advisory has been revoked - it doesn't affect any version of package kernel-rt (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS9-KERNELRT-9177067
- published9 Sept 2025
- disclosed26 Feb 2025
Introduced: 26 Feb 2025
CVE-2022-49270 (opens in a new tab)Amendment
The Centos security team deemed this advisory irrelevant for Centos:9.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by Centos.
In the Linux kernel, the following vulnerability has been resolved:
dm: fix use-after-free in dm_cleanup_zoned_dev()
dm_cleanup_zoned_dev() uses queue, so it must be called before blk_cleanup_disk() starts its killing:
blk_cleanup_disk->blk_cleanup_queue()->kobject_put()->blk_release_queue()-> ->...RCU...->blk_free_queue_rcu()->kmem_cache_free()
Otherwise, RCU callback may be executed first and dm_cleanup_zoned_dev() will touch free'd memory:
BUG: KASAN: use-after-free in dm_cleanup_zoned_dev+0x33/0xd0 Read of size 8 at addr ffff88805ac6e430 by task dmsetup/681
CPU: 4 PID: 681 Comm: dmsetup Not tainted 5.17.0-rc2+ #6 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x57/0x7d print_address_description.constprop.0+0x1f/0x150 ? dm_cleanup_zoned_dev+0x33/0xd0 kasan_report.cold+0x7f/0x11b ? dm_cleanup_zoned_dev+0x33/0xd0 dm_cleanup_zoned_dev+0x33/0xd0 __dm_destroy+0x26a/0x400 ? dm_blk_ioctl+0x230/0x230 ? up_write+0xd8/0x270 dev_remove+0x156/0x1d0 ctl_ioctl+0x269/0x530 ? table_clear+0x140/0x140 ? lock_release+0xb2/0x750 ? remove_all+0x40/0x40 ? rcu_read_lock_sched_held+0x12/0x70 ? lock_downgrade+0x3c0/0x3c0 ? rcu_read_lock_sched_held+0x12/0x70 dm_ctl_ioctl+0xa/0x10 __x64_sys_ioctl+0xb9/0xf0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb6dfa95c27
References
- https://access.redhat.com/security/cve/CVE-2022-49270
- https://git.kernel.org/stable/c/0987f00a76a17aa7213da492c00ed9e5a6210c73
- https://git.kernel.org/stable/c/43a043aed964659bc69ef81f266912b73c80d837
- https://git.kernel.org/stable/c/588b7f5df0cb64f281290c7672470c006abe7160
- https://git.kernel.org/stable/c/fdfe414ca28ddfd562c233fb27385cf820de03e8