CVE-2026-64594: Linux kernel · usb: gadget: f_fs: initialize reset_work at allocation time
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 5% 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 +43
Exploitation evidence
Disclosed: evidence found.
CVE published 6 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 and should be applied to affected linux-aws kernel versions. The fix initializes reset_work at allocation time, preventing cancel_work_sync() from operating on uninitialized work structs. Users should update to the fixed kernel versions as per the vendor advisory.
Description
A vulnerability in the Linux kernel's usb gadget functionfs subsystem was resolved by ensuring the reset_work structure is properly initialized at allocation time. Previously, cancel_work_sync() could be called on an uninitialized reset_work, causing kernel warnings and potential instability. This issue affects certain linux-aws kernel versions and has been fixed in updated releases.
References
- nvd.nist.gov/vuln/detail/CVE-2026-64594 (opens in a new tab)
- git.kernel.org/stable/c/0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7 (opens in a new tab)
- git.kernel.org/stable/c/3137b243c93982fe3460335e12f9247739766e10 (opens in a new tab)
- git.kernel.org/stable/c/69faa3779250df14f51d5084f938a99809546e52 (opens in a new tab)
- git.kernel.org/stable/c/7fe895e0a9651518c4fc082487da770ff9c14c7f (opens in a new tab)
- git.kernel.org/stable/c/ba1867999dbc4085e6d8c52ac5266005b8b2bf07 (opens in a new tab)
- git.kernel.org/stable/c/c36393b0d14e1e9783888f821ffe29381b8f46dc (opens in a new tab)
- git.kernel.org/stable/c/cb19e54ebe9baf3c3243083ade65c937339ccb7b (opens in a new tab)
- git.kernel.org/stable/c/d5631081be07f20e764d3cb5c98ac0a1004fba51 (opens in a new tab)
- ubuntu.com/security/CVE-2026-64594 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-64594 (opens in a new tab)
- git.kernel.org/linus/3137b243c93982fe3460335e12f9247739766e10 (opens in a new tab)
- ubuntu.com/security/notices/USN-8726-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8727-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8728-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8760-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8726-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8726-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8800-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8760-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8728-2 (opens in a new tab)