Use After Free Affecting kernel-syms package, versions <5.3.18-150200.24.209.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-SLES152-KERNELSYMS-8444211
  • published29 Nov 2024
  • disclosed28 Nov 2024

Introduced: 28 Nov 2024

CVE-2024-47747  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade SLES:15.2 kernel-syms to version 5.3.18-150200.24.209.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-syms package and not the kernel-syms package as distributed by SLES. See How to fix? for SLES:15.2 relevant fixed versions and status.

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

net: seeq: Fix use after free vulnerability in ether3 Driver Due to Race Condition

In the ether3_probe function, a timer is initialized with a callback function ether3_ledoff, bound to &prev(dev)->timer. Once the timer is started, there is a risk of a race condition if the module or device is removed, triggering the ether3_remove function to perform cleanup. The sequence of operations that may lead to a UAF bug is as follows:

CPU0 CPU1

                  |  ether3_ledoff

ether3_remove | free_netdev(dev); | put_devic | kfree(dev); | | ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2); | // use dev

Fix it by ensuring that the timer is canceled before proceeding with the cleanup in ether3_remove.

CVSS Scores

version 3.1