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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.24% (FIRST EPSS).
  • Fixed version: Linux Linux 34cd15d83b7206188d440b29b68084fcafde9395, 34fe9c2251f19786a6689149a6212c6c0de1d63b, 550a4fac7ecfee5bac6a0dd772456ca62fb72f46.

Low priority for now. Upgrade to Linux Linux 34cd15d83b7206188d440b29b68084fcafde9395, 34fe9c2251f19786a6689149a6212c6c0de1d63b, 550a4fac7ecfee5bac6a0dd772456ca62fb72f46 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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().

—No exploit Fix available
Published
Oct 22, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 16th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

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—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.2affected
    • 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and later · before 7ee059d06a5d3c15465959e0472993e80fbe4e81affected · git
    • 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and later · before 550a4fac7ecfee5bac6a0dd772456ca62fb72f46affected · git
    • 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and later · before e8b8e0d2bbf7d1172c4f435621418e29ee408d46affected · git
    • 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and later · before 7ae6aa649394e1e7f6dafb55ce0d578c0572a280affected · git
    • 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and later · before 34fe9c2251f19786a6689149a6212c6c0de1d63baffected · git
    • 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and later · before 34cd15d83b7206188d440b29b68084fcafde9395affected · git
    • 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and later · before 94e231c9d6f2648d2f1f68e7f476e050ee0a6159affected · git
    • 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and later · before d9971fa4d8bde63d49c743c1b32d12fbbd3a30bdaffected · git
    • 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 and later · before 88430ebcbc0ec637b710b947738839848c20feffaffected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.4-16.1.4-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2022-50561Oct 22, 2025 · iio: fix memory leak in iio_device_register_eventset()
    0Monitor
  • ← EarlierCVE-2022-50562Oct 22, 2025 · tpm: acpi: Call acpi_put_table() to fix memory leak
    0Monitor
  • Later →CVE-2022-50564Oct 22, 2025 · s390/netiucv: Fix return type of netiucv_tx()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux34cd15d83b7206188d440b29b68084fcafde9395Vendor (CNA)
Linux Linux34fe9c2251f19786a6689149a6212c6c0de1d63bVendor (CNA)
Linux Linux550a4fac7ecfee5bac6a0dd772456ca62fb72f46Vendor (CNA)
Linux Linux7ae6aa649394e1e7f6dafb55ce0d578c0572a280Vendor (CNA)
Linux Linux7ee059d06a5d3c15465959e0472993e80fbe4e81Vendor (CNA)
Linux Linux88430ebcbc0ec637b710b947738839848c20feffVendor (CNA)
Linux Linux94e231c9d6f2648d2f1f68e7f476e050ee0a6159Vendor (CNA)
Linux Linuxd9971fa4d8bde63d49c743c1b32d12fbbd3a30bdVendor (CNA)
Linux Linuxe8b8e0d2bbf7d1172c4f435621418e29ee408d46Vendor (CNA)
debian:linux6.1.4-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

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No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records