CVE-2023-53990

SMB3: Add missing locks to protect deferred close file list

HIGH

7.8

CVSS Score

Published: December 24, 2025 at 10:55 AM UTC

Updated: August 5, 2026 at 10:24 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: SMB3: Add missing locks to protect deferred close file list cifs_del_deferred_close function has a critical section which modifies the deferred close file list. We must acquire deferred_lock before calling cifs_del_deferred_close function.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v ≥ 5.19.45.15.63 ≤ v < 5.15.1115.19.4 ≤ v < 5.206.0 ≤ v < 6.1.286.0 ≤ v < 6.2.156.0 ≤ v < 6.3.26.0 ≤ v < 6.45.15.63 5.19.4 6.060b6d38add7b9c17d6e5d49ee8e930ea1a5650c5860efae127888ae535bc4eda1b7f27642727c69eca08d0eac020d48a3141dbec0a3cf64fbdb17cde

Vendor states this is fixed in 0f87e18203bd30f71eb1a65259e28e291b6cc43a (fixed)

Vendor states this is fixed in 32a046ccaeea6c19965c04a4c521e703f6607924 (fixed)

Vendor states this is fixed in 3aa9d065b0685b4e6052f3f2a2462966fdc44fd2 (fixed)

Vendor states this is fixed in ab9ddc87a9055c4bebd6524d5d761d605d52e557 (fixed)

Vendor states this is fixed in cb36365dac25d546ca4af0eb22acb43c9b4ddfdf (fixed)

Vendor states this is fixed in 5.15.111 (unaffected)

Affected range stops below 5.20, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 6.0 (unaffected)

Vendor states this is fixed in 6.1.28 (unaffected)

Vendor states this is fixed in 6.2.15 (unaffected)

Vendor states this is fixed in 6.3.2 (unaffected)

Vendor states this is fixed in 6.4 (unaffected)