Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5 ext4 ext4_ext_migrate deadlock

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00+

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5. It has been rated as critical. Affected by this vulnerability is the function ext4_ext_migrate of the component ext4. This manipulation causes deadlock. This vulnerability is tracked as CVE-2026-93269. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5. Affected by this vulnerability is the function ext4_ext_migrate of the component ext4. The manipulation with an unknown input leads to a deadlock vulnerability. The CWE definition for the vulnerability is CWE-833. The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ext4: fix circular lock dependency in ext4_ext_migrate Move iput(tmp_inode) after ext4_writepages_up_write() to avoid a circular lock dependency between s_writepages_rwsem and sb_internal (freeze protection). The deadlock scenario: CPU0 (EXT4_IOC_MIGRATE) CPU1 (orphan cleanup during mount) ---- ---- ext4_ext_migrate() ext4_writepages_down_write() s_writepages_rwsem (write) ext4_evict_inode() sb_start_intwrite() [sb_internal] ... ext4_writepages() s_writepages_rwsem (read) [BLOCKED] iput(tmp_inode) ext4_evict_inode() sb_start_intwrite() [BLOCKED] The tmp_inode is a temporary inode with nlink=0 created solely for building the extent tree. Its eviction does not require s_writepages_rwsem protection, so deferring iput() until after releasing the rwsem is safe.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-93269 since 09/17/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/24/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 452950461241dfed8b1d32e94b227db38c99c5af/ada23457d4748d6e9c36c6f871fc29a6f558c48c/e4223231b6860141813637a6413c2371ae4d6fa8/32f7ab52875ec7f800ca67e7176e5743a84baddf/a897682793eba5de51ee6f3152760374afa629cf is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Deadlock
CWE: CWE-833 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: 452950461241dfed8b1d32e94b227db38c99c5af/ada23457d4748d6e9c36c6f871fc29a6f558c48c/e4223231b6860141813637a6413c2371ae4d6fa8/32f7ab52875ec7f800ca67e7176e5743a84baddf/a897682793eba5de51ee6f3152760374afa629cf

Timelineinfo

09/17/2026 CVE reserved
09/24/2026 +7 days Advisory disclosed
09/24/2026 +0 days VulDB entry created
09/24/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-93269 (🔒)
GCVE (CVE): GCVE-0-2026-93269
GCVE (VulDB): GCVE-100-409717

Entryinfo

Created: 09/24/2026 20:25
Changes: 09/24/2026 20:25 (59)
Complete: 🔍
Cache ID: 216::103

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