NVD / CVE Program· CNA Linux

CVE-2022-50092: dm thin: fix use-after-free crash in dm_sm_register_threshold_callback

Noroxi assessment

Priority: Monitor (action score 22/100)

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).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 05cef0999b3208b5a6ede1bfac855139e4de55ef, 1a199fa9217d28511ff88529238fd9980ea64cf3, 3534e5a5ed2997ca1b00f44a0378a075bd05e8a3.

Low priority for now. Upgrade to Linux Linux 05cef0999b3208b5a6ede1bfac855139e4de55ef, 1a199fa9217d28511ff88529238fd9980ea64cf3, 3534e5a5ed2997ca1b00f44a0378a075bd05e8a3 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 use-after-free crash in dm_sm_register_threshold_callback Fault inject on pool metadata device reports: BUG: KASAN: use-after-free in dm_pool_register_metadata_threshold+0x40/0x80 Read of size 8 at addr ffff8881b9d50068 by task dmsetup/950 CPU: 7 PID: 950 Comm: dmsetup Tainted: G W 5.19.0-rc6 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x34/0x44 print_address_description.constprop.0.cold+0xeb/0x3f4 kasan_report.cold+0xe6/0x147 dm_pool_register_metadata_threshold+0x40/0x80 pool_ctr+0xa0a/0x1150 dm_table_add_target+0x2c8/0x640 table_load+0x1fd/0x430 ctl_ioctl+0x2c4/0x5a0 dm_ctl_ioctl+0xa/0x10 __x64_sys_ioctl+0xb3/0xd0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 This can be easily reproduced using: echo offline > /sys/block/sda/device/state dd if=/dev/zero of=/dev/mapper/thin bs=4k count=10 dmsetup load pool --table "0 20971520 thin-pool /dev/sda /dev/sdb 128 0 0" If a metadata commit fails, the transaction will be aborted and the metadata space maps will be destroyed. If a DM table reload then happens for this failed thin-pool, a use-after-free will occur in dm_sm_register_threshold_callback (called from dm_pool_register_metadata_threshold). Fix this by in dm_pool_register_metadata_threshold() by returning the -EINVAL error if the thin-pool is in fail mode. Also fail pool_ctr() with a new error message: "Error registering metadata threshold".

MediumCVSS 5.5 · v3.1—No exploit Fix available

BDU:2026-02805

Published: Jun 18, 2025
Updated: Jun 17, 2026
EPSS: 0.2% · 15th percentile
CWE: CWE-416

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

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No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel3.10 and later · before 5.4.211
linux linux kernel5.5 and later · before 5.10.137
linux linux kernel5.11 and later · before 5.15.61
linux linux kernel5.16 and later · before 5.18.18
linux linux kernel5.19 and later · before 5.19.2

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
- 3.10affected
- ac8c3f3df65e487bbcabf274eeeb9cd222f5da1e and later · before 05cef0999b3208b5a6ede1bfac855139e4de55efaffected · git
- ac8c3f3df65e487bbcabf274eeeb9cd222f5da1e and later · before 5e2cf705155a1514be3c96ea664a9cd356998ee7affected · git
- ac8c3f3df65e487bbcabf274eeeb9cd222f5da1e and later · before f83131a3071a0b61a4d7dca70f95adb3ffad920eaffected · git
- ac8c3f3df65e487bbcabf274eeeb9cd222f5da1e and later · before 1a199fa9217d28511ff88529238fd9980ea64cf3affected · git
- ac8c3f3df65e487bbcabf274eeeb9cd222f5da1e and later · before e4dbe24f4bfd8377e7ba79fdcdb7c4d6eb1c6790affected · git
- ac8c3f3df65e487bbcabf274eeeb9cd222f5da1e and later · before 3534e5a5ed2997ca1b00f44a0378a075bd05e8a3affected · git
- before 3.10not affected · semver
- 5.4.211 and later · up to and including 5.4.*not affected · semver
- 5.10.137 and later · up to and including 5.10.*not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.0.2-1	6.0.2-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
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CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
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CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2022-50089Jun 18, 2025 · btrfs: ensure pages are unlocked on cow_file_range() failure
22Monitor
← EarlierCVE-2022-50090Jun 18, 2025 · btrfs: replace BTRFS_MAX_EXTENT_SIZE with fs_info->max_extent_size
31Monitor
Later →CVE-2022-50093Jun 18, 2025 · iommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)
28Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
Linux Linux	05cef0999b3208b5a6ede1bfac855139e4de55ef	Vendor (CNA)
Linux Linux	1a199fa9217d28511ff88529238fd9980ea64cf3	Vendor (CNA)
Linux Linux	3534e5a5ed2997ca1b00f44a0378a075bd05e8a3	Vendor (CNA)
Linux Linux	5e2cf705155a1514be3c96ea664a9cd356998ee7	Vendor (CNA)
Linux Linux	e4dbe24f4bfd8377e7ba79fdcdb7c4d6eb1c6790	Vendor (CNA)
Linux Linux	f83131a3071a0b61a4d7dca70f95adb3ffad920e	Vendor (CNA)
debian:linux	6.0.2-1 · Debian:12	Package 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

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

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

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

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

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

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

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/05cef0999b3208b5a6ede1bfac855139e4de55ef

Show all references (5 more)

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

All records