Linux Kernel up to 6.6.151/6.12.103/6.18.44/7.1.8 fscrypt fscrypt_ioctl_set_policy privileges management

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 6.6.151/6.12.103/6.18.44/7.1.8. Impacted is the function fscrypt_ioctl_set_policy of the component fscrypt. Performing a manipulation results in privileges management. This vulnerability is reported as CVE-2026-74595. The attack requires a local approach. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.151/6.12.103/6.18.44/7.1.8. It has been classified as very critical. This affects the function fscrypt_ioctl_set_policy of the component fscrypt. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: fscrypt: use the mount idmap for the owner check in fscrypt_ioctl_set_policy() fscrypt_ioctl_set_policy() calls inode_owner_or_capable() with &nop_mnt_idmap before allowing an encryption policy to be set, instead of the idmap of the mount the ioctl was issued on. fscrypt is used by filesystems that support idmapped mounts (e.g. ext4, f2fs), so on such a mount this compares the caller's fsuid against the unmapped on-disk owner rather than the mapped owner: the actual owner can be wrongly denied with -EACCES and an unrelated caller wrongly allowed. Use file_mnt_idmap(filp) instead.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-74595 since 08/15/2026. The exploitability is told to be easy. An attack has to be approached locally. 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 08/24/2026). MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 339007 (Linux Distros Unpatched Vulnerability : CVE-2026-74595), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.152, 6.12.104, 6.18.45 or 7.1.9 eliminates this vulnerability. Applying the patch 33b7e810ce09955aa02f3b632455cf5e7ac990a9/6a67c460b12315033268dce597546984fe5739e7/653e888a24c87b8bbeab44d7e558a1c1a3641088/98516ba8b817f34e86bdd7a5b7a383cff75c3ddf/cf6c993c0feca7984797e634deba3c80342e199a is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (339007) and CERT Bund (WID-SEC-2026-2970). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Open Source Linux Kernel

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
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: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 339007
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-74595

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.152/6.12.104/6.18.45/7.1.9
Patch: 33b7e810ce09955aa02f3b632455cf5e7ac990a9/6a67c460b12315033268dce597546984fe5739e7/653e888a24c87b8bbeab44d7e558a1c1a3641088/98516ba8b817f34e86bdd7a5b7a383cff75c3ddf/cf6c993c0feca7984797e634deba3c80342e199a

Timelineinfo

08/15/2026 CVE reserved
08/22/2026 +7 days Advisory disclosed
08/22/2026 +0 days VulDB entry created
08/24/2026 +2 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74595 (🔒)
GCVE (CVE): GCVE-0-2026-74595
GCVE (VulDB): GCVE-100-394377
CERT Bund: WID-SEC-2026-2970 - Linux Kernel: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Entryinfo

Created: 08/22/2026 17:57
Updated: 08/24/2026 20:30
Changes: 08/22/2026 17:57 (59), 08/23/2026 17:24 (2), 08/24/2026 20:30 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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