CVE-2026-74382: Linux kernel · net/sched: cls_bpf: prevent unbounded recursion in offload rollback
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1117.124~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 12:55 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1117.124~20.04.1, 5.15.0-1123.132~20.04.1, 5.15.0-1122.131~20.04.1 +41
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 fixes the unbounded recursion by adding a flag to prevent recursive rollback calls. Users should apply the official Linux kernel updates for the affected Azure kernel versions to remediate this issue.
Description
A stack overflow vulnerability in the Linux kernel's cls_bpf_offload_cmd() function could cause unbounded recursion during offload rollback when tc_setup_cb_replace() fails repeatedly. This issue affects certain Linux Azure kernel versions and can lead to stack exhaustion. The vulnerability has been fixed by preventing recursive rollback calls. No known exploits are reported in the wild.
References
- nvd.nist.gov/vuln/detail/CVE-2026-74382 (opens in a new tab)
- git.kernel.org/stable/c/10753da2d659dd425a6e620f47f86852d604f67f (opens in a new tab)
- git.kernel.org/stable/c/1387f252a242a51bfbb6eace29c8f8db21b457da (opens in a new tab)
- git.kernel.org/stable/c/27db54b90bcc7c37867fe664107fa25ea6a116e4 (opens in a new tab)
- git.kernel.org/stable/c/33373e1f378a501bc51aa73312f74295c84e3101 (opens in a new tab)
- git.kernel.org/stable/c/3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7 (opens in a new tab)
- git.kernel.org/stable/c/4a76953c3ed043797e81529b9395e9ca6f4c7609 (opens in a new tab)
- git.kernel.org/stable/c/a018f208ab7512380bd4cf670064d48cba00a1b1 (opens in a new tab)
- git.kernel.org/stable/c/e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7 (opens in a new tab)
- ubuntu.com/security/CVE-2026-74382 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-74382 (opens in a new tab)
- git.kernel.org/linus/27db54b90bcc7c37867fe664107fa25ea6a116e4 (opens in a new tab)
- ubuntu.com/security/notices/USN-8876-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8878-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8879-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8877-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8875-1 (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)