Deadlock Affecting kernel-kdump-devel package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (11th percentile)

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  • Snyk IDSNYK-RHEL6-KERNELKDUMPDEVEL-6553774
  • published4 Apr 2024
  • disclosed3 Apr 2024

Introduced: 3 Apr 2024

CVE-2024-26755  (opens in a new tab)
CWE-833  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:6 kernel-kdump-devel.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-kdump-devel package and not the kernel-kdump-devel package as distributed by RHEL. See How to fix? for RHEL:6 relevant fixed versions and status.

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

md: Don't suspend the array for interrupted reshape

md_start_sync() will suspend the array if there are spares that can be added or removed from conf, however, if reshape is still in progress, this won't happen at all or data will be corrupted(remove_and_add_spares won't be called from md_choose_sync_action for reshape), hence there is no need to suspend the array if reshape is not done yet.

Meanwhile, there is a potential deadlock for raid456:

  1. reshape is interrupted;

  2. set one of the disk WantReplacement, and add a new disk to the array, however, recovery won't start until the reshape is finished;

  3. then issue an IO across reshpae position, this IO will wait for reshape to make progress;

  4. continue to reshape, then md_start_sync() found there is a spare disk that can be added to conf, mddev_suspend() is called;

Step 4 and step 3 is waiting for each other, deadlock triggered. Noted this problem is found by code review, and it's not reporduced yet.

Fix this porblem by don't suspend the array for interrupted reshape, this is safe because conf won't be changed until reshape is done.

CVSS Scores

version 3.1