Unknown

CVE-2022-50563 — dm thin: Fix UAF in run_timer_softirq()

In the Linux kernel, the following vulnerability has been resolved: dm thin: Fix UAF in run_timer_softirq() When dm_resume() and dm_destroy() are concurrent, it will lead to UAF, as follows: BUG: KASAN: use-after-free in __run_timers+0x173/0x710 Write of size 8 at addr ffff88816d9490f0 by task swapper/0/0 <snip> Call Trace: <IRQ> dump_stack_lvl+0x73/0x9f print_report.cold+0x132/0xaa2 _raw_spin_lock_irqsave+0xcd/0x160 __run_timers+0x173/0x710 kasan_report+0xad/0x110 __run_timers+0x173/0x710 __asan_store8+0x9c/0x140 __run_timers+0x173/0x710 call_timer_fn+0x310/0x310 pvclock_clocksource_read+0xfa/0x250 kvm_clock_read+0x2c/0x70 kvm_clock_get_cycles+0xd/0x20 ktime_get+0x5c/0x110 lapic_next_event+0x38/0x50 clockevents_program_event+0xf1/0x1e0 run_timer_softirq+0x49/0x90 __do_softirq+0x16e/0x62c __irq_exit_rcu+0x1fa/0x270 irq_exit_rcu+0x12/0x20 sysvec_apic_timer_interrupt+0x8e/0xc0 One of the concurrency UAF can be shown as below: use free do_resume | __find_device_hash_cell | dm_get | atomic_inc(&md->holders) | | dm_destroy | __dm_destroy | if (!dm_suspended_md(md)) | atomic_read(&md->holders) | msleep(1) dm_resume | __dm_resume | dm_table_resume_targets | pool_resume | do_waker #add delay work | dm_put | atomic_dec(&md->holders) | | dm_table_destroy | pool_dtr | __pool_dec | __pool_destroy | destroy_workqueue | kfree(pool) # free pool time out __do_softirq run_timer_softirq # pool has already been freed This can be easily reproduced using: 1. create thin-pool 2. dmsetup suspend pool 3. dmsetup resume pool 4. dmsetup remove_all # Concurrent with 3 The root cause of this UAF bug is that dm_resume() adds timer after dm_destroy() skips cancelling the timer because of suspend status. After timeout, it will call run_timer_softirq(), however pool has already been freed. The concurrency UAF bug will happen. Therefore, cancelling timer again in __pool_destroy().

Published Oct 22, 2025 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.25%

ahead of 15% of scored CVEs · Oct 14, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and < 7ee059d06a5d3c15465959e0472993e80fbe4e81≥ 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and < 550a4fac7ecfee5bac6a0dd772456ca62fb72f46≥ 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and < e8b8e0d2bbf7d1172c4f435621418e29ee408d46≥ 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and < 7ae6aa649394e1e7f6dafb55ce0d578c0572a280≥ 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and < 34fe9c2251f19786a6689149a6212c6c0de1d63b≥ 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and < 34cd15d83b7206188d440b29b68084fcafde9395≥ 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and < 94e231c9d6f2648d2f1f68e7f476e050ee0a6159≥ 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and < d9971fa4d8bde63d49c743c1b32d12fbbd3a30bd and 2 more ≥ 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and < 88430ebcbc0ec637b710b947738839848c20feffversion 3.2	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.25%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 13, 2026
Affected products added · linux/linux
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Deferred
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
2025
CVE published
Oct 22, 2025 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

9 on the record

git.kernel.org/stable/c/34cd15d83b7206188d440b29b68084fcafde9395
NIST National Vulnerability Database
git.kernel.org/stable/c/d9971fa4d8bde63d49c743c1b32d12fbbd3a30bd
NIST National Vulnerability Database
git.kernel.org/stable/c/7ee059d06a5d3c15465959e0472993e80fbe4e81
NIST National Vulnerability Database
git.kernel.org/stable/c/e8b8e0d2bbf7d1172c4f435621418e29ee408d46
NIST National Vulnerability Database
git.kernel.org/stable/c/88430ebcbc0ec637b710b947738839848c20feff
NIST National Vulnerability Database
git.kernel.org/stable/c/550a4fac7ecfee5bac6a0dd772456ca62fb72f46
NIST National Vulnerability Database
git.kernel.org/stable/c/7ae6aa649394e1e7f6dafb55ce0d578c0572a280
NIST National Vulnerability Database
git.kernel.org/stable/c/34fe9c2251f19786a6689149a6212c6c0de1d63b
NIST National Vulnerability Database
git.kernel.org/stable/c/94e231c9d6f2648d2f1f68e7f476e050ee0a6159
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 6h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 6h
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2022-50563 is "dm thin: Fix UAF in run_timer_softirq()", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.25% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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