CVE-2026-43432: Linux kernel · usb: xhci: Fix memory leak in xhci_disable_slot()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in c65f1b840ab8ce72ba68f1b63bab7960f8fdfa89 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:04 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in c65f1b840ab8ce72ba68f1b63bab7960f8fdfa89, c1c8550e70401159184130a1afc6261db01fc0ce, 6288baf0c8c4dcfbf206773aede9c1f2269cec28 +9
Exploitation evidence
Disclosed: evidence found.
CVE published 8 May 2026
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 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
Description
In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix memory leak in xhci_disable_slot() xhci_alloc_command() allocates a command structure and, when the second argument is true, also allocates a completion structure. Currently, the error handling path in xhci_disable_slot() only frees the command structure using kfree(), causing the completion structure to leak. Use xhci_free_command() instead of kfree(). xhci_free_command() correctly frees both the command structure and the associated completion structure. Since the command structure is allocated with zero-initialization, command->in_ctx is NULL and will not be erroneously freed by xhci_free_command(). This bug was found using an experimental static analysis tool we are developing. The tool is based on the LLVM framework and is specifically designed to detect memory management issues. It is currently under active development and not yet publicly available, but we plan to open-source it after our research is published. The bug was originally detected on v6.13-rc1 using our static analysis tool, and we have verified that the issue persists in the latest mainline kernel. We performed build testing on x86_64 with allyesconfig using GCC=11.4.0. Since triggering these error paths in xhci_disable_slot() requires specific hardware conditions or abnormal state, we were unable to construct a test case to reliably trigger these specific error paths at runtime.
References
- git.kernel.org/stable/c/1e800e26d54ccf2ddf2ea6d6cbe021c804d8aa62 (opens in a new tab)
- git.kernel.org/stable/c/6288baf0c8c4dcfbf206773aede9c1f2269cec28 (opens in a new tab)
- git.kernel.org/stable/c/46aea90763832cd6e9b0c2e1c00e6a9512156d4b (opens in a new tab)
- git.kernel.org/stable/c/2e2baa8fb5aa4d080cbfeb84c51eff797529f413 (opens in a new tab)
- git.kernel.org/stable/c/807e4fb5140c73eb5dba1e399a990db5c1f3cdf8 (opens in a new tab)
- git.kernel.org/stable/c/c65f1b840ab8ce72ba68f1b63bab7960f8fdfa89 (opens in a new tab)
- git.kernel.org/stable/c/078b446efc0f5e496c31bccb72b98af979963a83 (opens in a new tab)
- git.kernel.org/stable/c/c1c8550e70401159184130a1afc6261db01fc0ce (opens in a new tab)