CVE-2017-7374

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-03-31 · updated 2026-06-17
Weakness: CWE-416

Description

Use-after-free vulnerability in fs/crypto/ in the Linux kernel before 4.10.7 allows local users to cause a denial of service (NULL pointer dereference) or possibly gain privileges by revoking keyring keys being used for ext4, f2fs, or ubifs encryption, causing cryptographic transform objects to be freed prematurely.

Affected products

Linux kernel: from 4.2 before 4.4.59; from 4.5 before 4.9.20; from 4.10 before 4.10.7 — fixed in 4.10.7, 4.4.59, 4.9.20

How to fix

Upgrade to a fixed version: Linux kernel 4.10.7, 4.4.59, 4.9.20. Check the vendor advisory for mitigations.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1b53cf9815bb4744958d41f3795d5d5a1d365e2d
http://www.securityfocus.com/bid/97308
https://github.com/torvalds/linux/commit/1b53cf9815bb4744958d41f3795d5d5a1d365e2d
https://source.android.com/security/bulletin/2017-10-01
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.10.7
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1b53cf9815bb4744958d41f3795d5d5a1d365e2d
http://www.securityfocus.com/bid/97308
https://github.com/torvalds/linux/commit/1b53cf9815bb4744958d41f3795d5d5a1d365e2d
https://source.android.com/security/bulletin/2017-10-01
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.10.7

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