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NVD / CVE Program· CNA Linux

CVE-2026-45924: ksmbd: call ksmbd_vfs_kern_path_end_removing() on some error paths

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: 0.12% (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 0c578e8065c4b08d5635a4cbc0f6321df9d20f79, 34d6691933682f0516259a31b39d2cebcedec0a5, 4c38600feb81c670edb82e49d201d3d2d00cd4c3.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0c578e8065c4b08d5635a4cbc0f6321df9d20f79, 34d6691933682f0516259a31b39d2cebcedec0a5, 4c38600feb81c670edb82e49d201d3d2d00cd4c3 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: ksmbd: call ksmbd_vfs_kern_path_end_removing() on some error paths There are two places where ksmbd_vfs_kern_path_end_removing() needs to be called in order to balance what the corresponding successful call to ksmbd_vfs_kern_path_start_removing() has done, i.e. drop inode locks and put the taken references. Otherwise there might be potential deadlocks and unbalanced locks which are caught like: BUG: workqueue leaked lock or atomic: kworker/5:21/0x00000000/7596 last function: handle_ksmbd_work 2 locks held by kworker/5:21/7596: #0: ffff8881051ae448 (sb_writers#3){.+.+}-{0:0}, at: ksmbd_vfs_kern_path_locked+0x142/0x660 #1: ffff888130e966c0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: ksmbd_vfs_kern_path_locked+0x17d/0x660 CPU: 5 PID: 7596 Comm: kworker/5:21 Not tainted 6.1.162-00456-gc29b353f383b #138 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 Workqueue: ksmbd-io handle_ksmbd_work Call Trace: <TASK> dump_stack_lvl+0x44/0x5b process_one_work.cold+0x57/0x5c worker_thread+0x82/0x600 kthread+0x153/0x190 ret_from_fork+0x22/0x30 </TASK> Found by Linux Verification Center (linuxtesting.org).

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 27, 2026
Updated
Jun 24, 2026
EPSS
0.1% · 1th 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

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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 kernel5.15.190 and later · before 5.15.203
  • linux linux kernel6.1.149 and later · before 6.1.167
  • linux linux kernel6.6.103 and later · before 6.6.130
  • linux linux kernel6.12.43 and later · before 6.12.78
  • linux linux kernel6.15.11 and later · before 6.16
  • linux linux kernel6.16.2 and later · before 6.18.17
  • linux linux kernel6.19 and later · before 6.19.4

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

    • a7dddd62578c2eb6cb28b8835556a121b5157323, a726fef6d7d4cfc365d3434e3916dbfe78991a33, 6.17affected
    • 9d5012ffe14120f978ee34aef4df3d6cb026b7c4 and later · before 8e3a3192ef78d8302916408d62813b1fddfc8972affected · git
    • ac98d54630d5b52e3f684d872f0d82c06c418ea9 and later · before f221baa80e5959a0c08a7e34abbf2a4d3cf0e1c2affected · git
    • 1e858a7a51c7b8b009d8f246de7ceb7743b44a71 and later · before cf29329a13df79c198b45dfc92577638d30b56faaffected · git
    • 814cfdb6358d9b84fcbec9918c8f938cc096a43a and later · before 34d6691933682f0516259a31b39d2cebcedec0a5affected · git
    • d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 and later · before 0c578e8065c4b08d5635a4cbc0f6321df9d20f79affected · git
    • d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 and later · before 4c38600feb81c670edb82e49d201d3d2d00cd4c3affected · git
    • d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 and later · before a09dc10d1353f0e92c21eae2a79af1c2b1ddcde8affected · git
    • 5.15.190 and later · before 5.15.203affected · semver
    • 6.1.149 and later · before 6.1.167affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.6-16.19.6-1

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-2026-45922May 27, 2026 · RDMA/mlx5: Fix memory leak in GET_DATA_DIRECT_SYSFS_PATH handler
    22Monitor
  • ← EarlierCVE-2026-45923May 27, 2026 · net: usb: catc: enable basic endpoint checking
    22Monitor
  • Later →CVE-2026-45925May 27, 2026 · thermal/of: Fix reference leak in thermal_of_cm_lookup()
    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 Linux0c578e8065c4b08d5635a4cbc0f6321df9d20f79Vendor (CNA)
Linux Linux34d6691933682f0516259a31b39d2cebcedec0a5Vendor (CNA)
Linux Linux4c38600feb81c670edb82e49d201d3d2d00cd4c3Vendor (CNA)
Linux Linux5.15.203Vendor (CNA)
Linux Linux6.1.167Vendor (CNA)
Linux Linux6.12.78Vendor (CNA)
Linux Linux6.16Vendor (CNA)
Linux Linux6.17Vendor (CNA)
Linux Linux6.6.130Vendor (CNA)
Linux Linux8e3a3192ef78d8302916408d62813b1fddfc8972Vendor (CNA)
Linux Linuxa09dc10d1353f0e92c21eae2a79af1c2b1ddcde8Vendor (CNA)
Linux Linuxcf29329a13df79c198b45dfc92577638d30b56faVendor (CNA)
Linux Linuxf221baa80e5959a0c08a7e34abbf2a4d3cf0e1c2Vendor (CNA)
debian:linux6.1.170-1 · 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.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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-667 · Improper Locking

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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (6 more)

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

All records