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NVD / CVE Program· CNA Linux

CVE-2022-50434: blk-mq: fix possible memleak when register 'hctx' failed

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: 0.18% (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 02bc8bc6eab03c84373281b85cb6e98747172ff7, 33e8a3f61814ea30615d0fafaf50477975d6c1ca, 4b7a21c57b14fbcd0e1729150189e5933f5088e9.

Low priority for now. Upgrade to Linux Linux 02bc8bc6eab03c84373281b85cb6e98747172ff7, 33e8a3f61814ea30615d0fafaf50477975d6c1ca, 4b7a21c57b14fbcd0e1729150189e5933f5088e9 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: blk-mq: fix possible memleak when register 'hctx' failed There's issue as follows when do fault injection test: unreferenced object 0xffff888132a9f400 (size 512): comm "insmod", pid 308021, jiffies 4324277909 (age 509.733s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 08 f4 a9 32 81 88 ff ff ...........2.... 08 f4 a9 32 81 88 ff ff 00 00 00 00 00 00 00 00 ...2............ backtrace: [<00000000e8952bb4>] kmalloc_node_trace+0x22/0xa0 [<00000000f9980e0f>] blk_mq_alloc_and_init_hctx+0x3f1/0x7e0 [<000000002e719efa>] blk_mq_realloc_hw_ctxs+0x1e6/0x230 [<000000004f1fda40>] blk_mq_init_allocated_queue+0x27e/0x910 [<00000000287123ec>] __blk_mq_alloc_disk+0x67/0xf0 [<00000000a2a34657>] 0xffffffffa2ad310f [<00000000b173f718>] 0xffffffffa2af824a [<0000000095a1dabb>] do_one_initcall+0x87/0x2a0 [<00000000f32fdf93>] do_init_module+0xdf/0x320 [<00000000cbe8541e>] load_module+0x3006/0x3390 [<0000000069ed1bdb>] __do_sys_finit_module+0x113/0x1b0 [<00000000a1a29ae8>] do_syscall_64+0x35/0x80 [<000000009cd878b0>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 Fault injection context as follows: kobject_add blk_mq_register_hctx blk_mq_sysfs_register blk_register_queue device_add_disk null_add_dev.part.0 [null_blk] As 'blk_mq_register_hctx' may already add some objects when failed halfway, but there isn't do fallback, caller don't know which objects add failed. To solve above issue just do fallback when add objects failed halfway in 'blk_mq_register_hctx'.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Oct 1, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 7th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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.

VendorProduct
linuxlinux kernel

Affected versions

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

  • linux linux kernel3.16 and later · before 4.9.337
  • linux linux kernel4.10 and later · before 4.14.303
  • linux linux kernel4.15 and later · before 4.19.270
  • linux linux kernel4.20 and later · before 5.4.229
  • linux linux kernel5.5 and later · before 5.10.163
  • linux linux kernel5.11 and later · before 5.15.86
  • linux linux kernel5.16 and later · before 6.0.16
  • linux linux kernel6.1 and later · before 6.1.2

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

    • 3.16affected
    • 67aec14ce87fe25bdfff7dbf468556333df11c4e and later · before 654870789c3c1b9763316ef1c71d7a449127b175affected · git
    • 67aec14ce87fe25bdfff7dbf468556333df11c4e and later · before cb186eb47fb9dd327bdefa15f0c5fc55c53a40ddaffected · git
    • 67aec14ce87fe25bdfff7dbf468556333df11c4e and later · before 02bc8bc6eab03c84373281b85cb6e98747172ff7affected · git
    • 67aec14ce87fe25bdfff7dbf468556333df11c4e and later · before 87fd18016a47ea8ae12641377a390172c4aa97a7affected · git
    • 67aec14ce87fe25bdfff7dbf468556333df11c4e and later · before e8022da1fa2fdf2fa204b445dd3354e7a66d085aaffected · git
    • 67aec14ce87fe25bdfff7dbf468556333df11c4e and later · before eff45bfbc25a2509a6362dea6e699e14083c693caffected · git
    • 67aec14ce87fe25bdfff7dbf468556333df11c4e and later · before 4b7fafa5f39b15c3a6ca3b95e534d05d6904cc95affected · git
    • 67aec14ce87fe25bdfff7dbf468556333df11c4e and later · before 33e8a3f61814ea30615d0fafaf50477975d6c1caaffected · git
    • 67aec14ce87fe25bdfff7dbf468556333df11c4e and later · before 4b7a21c57b14fbcd0e1729150189e5933f5088e9affected · 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-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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
    89Now
  • 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-2022-50433Oct 1, 2025 · efi: ssdt: Don't free memory if ACPI table was loaded successfully
    31Monitor
  • ← EarlierCVE-2025-39920Oct 1, 2025 · pcmcia: Add error handling for add_interval() in do_validate_mem()
    22Monitor
  • Later →CVE-2025-39921Oct 1, 2025 · spi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback
    22Monitor

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 Linux02bc8bc6eab03c84373281b85cb6e98747172ff7Vendor (CNA)
Linux Linux33e8a3f61814ea30615d0fafaf50477975d6c1caVendor (CNA)
Linux Linux4b7a21c57b14fbcd0e1729150189e5933f5088e9Vendor (CNA)
Linux Linux4b7fafa5f39b15c3a6ca3b95e534d05d6904cc95Vendor (CNA)
Linux Linux654870789c3c1b9763316ef1c71d7a449127b175Vendor (CNA)
Linux Linux87fd18016a47ea8ae12641377a390172c4aa97a7Vendor (CNA)
Linux Linuxcb186eb47fb9dd327bdefa15f0c5fc55c53a40ddVendor (CNA)
Linux Linuxe8022da1fa2fdf2fa204b445dd3354e7a66d085aVendor (CNA)
Linux Linuxeff45bfbc25a2509a6362dea6e699e14083c693cVendor (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

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.

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

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-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

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

nvd-primary

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✗ → ✓

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

References

Show all references (8 more)

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

All records