CVE-2024-26627: Linux kernel · scsi: core: Move scsi_host_busy() out of host lock for waking up EH handler
Affects Linux kernelSource GCVE Database
Not known to be exploited · CVSS 5.5 Medium · fixed in 5.15.0-1061.67~20.04.1 : update Linux kernel when convenient.
Data as of 12 Nov 2026, 18:50 UTC
- Patch
- Available – fixed in 5.15.0-1061.67~20.04.1, 5.15.0-1063.72~20.04.1, 5.15.0-1059.67~20.04.1 +39
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 6 Mar 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Patches and advisories
- ubuntu.com/security/notices/USN-6688-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6766-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6766-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-6766-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-6795-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6818-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6819-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6818-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-6828-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6819-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-6819-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-6818-3 (opens in a new tab)
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu Pro Realtime 24.04 LTSlinux-raspi-realtimepkg:deb/ubuntu/linux-raspi-realtime?arch=source&distro=realtime/nobleOther threats | Affected
| Fixed in
|
Ubuntu 22.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=jammyOther threats | Affected
| Fixed in
|
Ubuntu 22.04 LTSlinux-allwinner-5.19pkg:deb/ubuntu/linux-allwinner-5.19?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Ubuntu 22.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=jammyOther threats | Affected
| Fixed in
|
Ubuntu 22.04 LTSlinux-aws-5.19pkg:deb/ubuntu/linux-aws-5.19?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Ubuntu 22.04 LTSlinux-aws-6.2pkg:deb/ubuntu/linux-aws-6.2?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
In the Linux kernel, the following vulnerability has been resolved: scsi: core: Move scsi_host_busy() out of host lock for waking up EH handler Inside scsi_eh_wakeup(), scsi_host_busy() is called & checked with host lock every time for deciding if error handler kthread needs to be waken up. This can be too heavy in case of recovery, such as: - N hardware queues - queue depth is M for each hardware queue - each scsi_host_busy() iterates over (N * M) tag/requests If recovery is triggered in case that all requests are in-flight, each scsi_eh_wakeup() is strictly serialized, when scsi_eh_wakeup() is called for the last in-flight request, scsi_host_busy() has been run for (N * M - 1) times, and request has been iterated for (N*M - 1) * (N * M) times. If both N and M are big enough, hard lockup can be triggered on acquiring host lock, and it is observed on mpi3mr(128 hw queues, queue depth 8169). Fix the issue by calling scsi_host_busy() outside the host lock. We don't need the host lock for getting busy count because host the lock never covers that. [mkp: Drop unnecessary 'busy' variables pointed out by Bart]
References
- ubuntu.com/security/CVE-2024-26627 (opens in a new tab)
- git.kernel.org/linus/4373534a9850627a2695317944898eb1283a2db0 (opens in a new tab)
- git.kernel.org/stable/c/f5944853f7a961fedc1227dc8f60393f8936d37c (opens in a new tab)
- git.kernel.org/stable/c/d37c1c81419fdef66ebd0747cf76fb8b7d979059 (opens in a new tab)
- git.kernel.org/stable/c/db6338f45971b4285ea368432a84033690eaf53c (opens in a new tab)
- git.kernel.org/stable/c/65ead8468c21c2676d4d06f50b46beffdea69df1 (opens in a new tab)
- git.kernel.org/stable/c/07e3ca0f17f579491b5f54e9ed05173d6c1d6fcb (opens in a new tab)
- git.kernel.org/stable/c/4373534a9850627a2695317944898eb1283a2db0 (opens in a new tab)
- ubuntu.com/security/notices/USN-6688-1 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2024-26627 (opens in a new tab)
- ubuntu.com/security/notices/USN-6766-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6766-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-6766-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-6795-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6818-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6819-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6818-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-6828-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-6819-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-6819-3 (opens in a new tab)