Linux Kernel up to 6.12.74/6.18.13/6.19.3 gfs2 qd_put use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.43

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.12.74/6.18.13/6.19.3. Impacted is the function qd_put of the component gfs2. Such manipulation leads to use after free. This vulnerability is traded as CVE-2026-45861. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.74/6.18.13/6.19.3. It has been rated as critical. Affected by this issue is the function qd_put of the component gfs2. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix slab-use-after-free in qd_put Commit a475c5dd16e5 ("gfs2: Free quota data objects synchronously") started freeing quota data objects during filesystem shutdown instead of putting them back onto the LRU list, but it failed to remove these objects from the LRU list, causing LRU list corruption. This caused use-after-free when the shrinker (gfs2_qd_shrink_scan) tried to access already-freed objects on the LRU list. Fix this by removing qd objects from the LRU list before freeing them in qd_put(). Initial fix from Deepanshu Kartikey <[email protected]>.

The weakness was shared by shutdown. The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-45861 since 05/13/2026. The exploitation is known to be easy. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/30/2026).

The vulnerability scanner Nessus provides a plugin with the ID 329305 (openSUSE 16: cluster-md-kmp-64kb / cluster-md-kmp-azure / cluster-md-kmp-default / etc (openSUSE-SU-2026:21388-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.75, 6.18.14 or 6.19.4 eliminates this vulnerability. Applying the patch ca7c67bdd293089b3483f18886d6b2d0037d2ad9/1d47922b98046b8070a77347fb883a6523792803/80fff26d7a0c3926b511661c27eecc811a420eef/22150a7d401d9e9169b9b68e05bed95f7f49bf69 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (329305) and CERT Bund (WID-SEC-2026-1700). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Siemens SIMATIC S7

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 329305
Nessus Name: openSUSE 16: cluster-md-kmp-64kb / cluster-md-kmp-azure / cluster-md-kmp-default / etc (openSUSE-SU-2026:21388-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.75/6.18.14/6.19.4
Patch: ca7c67bdd293089b3483f18886d6b2d0037d2ad9/1d47922b98046b8070a77347fb883a6523792803/80fff26d7a0c3926b511661c27eecc811a420eef/22150a7d401d9e9169b9b68e05bed95f7f49bf69

Timelineinfo

05/13/2026 CVE reserved
05/27/2026 +14 days Advisory disclosed
05/27/2026 +0 days VulDB entry created
07/30/2026 +64 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Researcher: shutdown
Status: Confirmed

CVE: CVE-2026-45861 (🔒)
GCVE (CVE): GCVE-0-2026-45861
GCVE (VulDB): GCVE-100-366074
CERT Bund: WID-SEC-2026-1700 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 05/27/2026 16:19
Updated: 07/30/2026 11:27
Changes: 05/27/2026 16:19 (60), 06/14/2026 15:32 (7), 06/22/2026 18:26 (1), 06/26/2026 02:42 (12), 07/25/2026 13:37 (4), 07/30/2026 11:27 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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