CVE-2022-48941

MEDIUM EPSS 6.0%
Published Aug 22, 20241y ago · Modified Jun 17, 20261w ago
4.7 CVSS 3.1
Medium
Find Similar
Published Aug 22, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ice: fix concurrent reset and removal of VFs Commit c503e63200c6 ("ice: Stop processing VF messages during teardown") introduced a driver state flag, ICE_VF_DEINIT_IN_PROGRESS, which is intended to prevent some issues with concurrently handling messages from VFs while tearing down the VFs. This change was motivated by crashes caused while tearing down and bringing up VFs in rapid succession. It turns out that the fix actually introduces issues with the VF driver caused because the PF no longer responds to any messages sent by the VF during its .remove routine. This results in the VF potentially removing its DMA memory before the PF has shut down the device queues. Additionally, the fix doesn't actually resolve concurrency issues within the ice driver. It is possible for a VF to initiate a reset just prior to the ice driver removing VFs. This can result in the remove task concurrently operating while the VF is being reset. This results in similar memory corruption and panics purportedly fixed by that commit. Fix this concurrency at its root by protecting both the reset and removal flows using the existing VF cfg_lock. This ensures that we cannot remove the VF while any outstanding critical tasks such as a virtchnl message or a reset are occurring. This locking change also fixes the root cause originally fixed by commit c503e63200c6 ("ice: Stop processing VF messages during teardown"), so we can simply revert it. Note that I kept these two changes together because simply reverting the original commit alone would leave the driver vulnerable to worse race conditions.

CVSS Details

Base Score
4.7
Exploitability
1.0
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
6.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-362

Affected Products 3

VendorProductVersionRange
linuxlinux_kernel* <5.10.104
linuxlinux_kernel*≥5.11  –  <5.15.26
linuxlinux_kernel*≥5.16  –  <5.16.12

References 3

  • git.kernel.org https://git.kernel.org/stable/c/2a3e61de89bab6696aa28b70030eb119968c5586
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3c805fce07c9dbc47d8a9129c7c5458025951957
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fadead80fe4c033b5e514fcbadd20b55c4494112
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2a3e61de89bab6696aa28b70030eb119968c5586
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3c805fce07c9dbc47d8a9129c7c5458025951957
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fadead80fe4c033b5e514fcbadd20b55c4494112
    Patch