CVE-2026-74266: Linux kernel · net/sched: sch_dualpi2: Do not call qdisc_tree_reduce_backlog during peek before
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 7.0.0-1014.14~24.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 7.0.0-1014.14~24.04.1, 7.0.0-1017.17~24.04.1, 7.0.0-1016.16~24.04.1 +11
Exploitation evidence
Disclosed: evidence found.
CVE published 15 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A patch is available that corrects the order of operations in the sch_dualpi2 code to prevent the null pointer dereference. Users should apply the official Linux kernel updates that include this fix. No additional mitigation steps are indicated by the vendor advisory.
Description
A vulnerability in the Linux kernel's net/sched subsystem (sch_dualpi2) was fixed. The issue involved an incorrect call to qdisc_tree_reduce_backlog during a peek operation before the queue length (qlen) was properly restored. This could lead to the parent's class being mistakenly deactivated and a null pointer dereference causing a general protection fault. The flaw has been addressed by adjusting the order of function calls to ensure qlen is restored before calling qdisc_tree_reduce_backlog.
References
- nvd.nist.gov/vuln/detail/CVE-2026-74266 (opens in a new tab)
- git.kernel.org/stable/c/15cd0c93bf4f892d66bc7a93667e2357b5673365 (opens in a new tab)
- git.kernel.org/stable/c/466f29477cae2bd1982a066d518a9b20c5a37924 (opens in a new tab)
- git.kernel.org/stable/c/bd851b10daee7199a658458b8ce250e95a334500 (opens in a new tab)
- ubuntu.com/security/CVE-2026-74266 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-74266 (opens in a new tab)
- git.kernel.org/linus/15cd0c93bf4f892d66bc7a93667e2357b5673365 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8889-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-3 (opens in a new tab)