Link Following Affecting kernel-uek-devel package, versions <0:5.4.17-2136.337.5.el8uek


Severity

Recommended
0.0
high
0
10

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-ORACLE8-KERNELUEKDEVEL-8371358
  • published14 Nov 2024
  • disclosed18 Sept 2024

Introduced: 18 Sep 2024

CVE-2024-46744  (opens in a new tab)
CWE-59  (opens in a new tab)

How to fix?

Upgrade Oracle:8 kernel-uek-devel to version 0:5.4.17-2136.337.5.el8uek or higher.
This issue was patched in ELSA-2024-12813.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-devel package and not the kernel-uek-devel package as distributed by Oracle. See How to fix? for Oracle:8 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

Squashfs: sanity check symbolic link size

Syzkiller reports a "KMSAN: uninit-value in pick_link" bug.

This is caused by an uninitialised page, which is ultimately caused by a corrupted symbolic link size read from disk.

The reason why the corrupted symlink size causes an uninitialised page is due to the following sequence of events:

  1. squashfs_read_inode() is called to read the symbolic link from disk. This assigns the corrupted value 3875536935 to inode->i_size.

  2. Later squashfs_symlink_read_folio() is called, which assigns this corrupted value to the length variable, which being a signed int, overflows producing a negative number.

  3. The following loop that fills in the page contents checks that the copied bytes is less than length, which being negative means the loop is skipped, producing an uninitialised page.

This patch adds a sanity check which checks that the symbolic link size is not larger than expected.

--

V2: fix spelling mistake.

CVSS Scores

version 3.1