CVE-2026-31485: Linux kernel · UAF
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in fbe6f40caeebb0b1ea9dfedc259124c1d3cda7a6 : patch Linux kernel soon.
Data as of 5 Nov 2026, 22:21 UTC
Rated High by Threat Radar's AI analysis · 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, 2026-11-05.
- Patch
- Available – fixed in fbe6f40caeebb0b1ea9dfedc259124c1d3cda7a6, e89e2b97253c124d37bf88e96e5e8ce5c3aeeec3, e3fd54f8b0317fbccc103961ddd660f2a32dcf0b +5
Exploitation evidence
Disclosed: evidence found.
CVE published 22 Apr 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 5 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
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
AI-suggested
A fix is available that changes the SPI controller registration from devm_spi_register_controller() to spi_register_controller() and adds explicit unregistration in the remove function. Users should apply the patch or update to a fixed Linux kernel version containing the commit hashes listed in the established facts.
Description
CVE-2026-31485 is a use-after-free vulnerability in the Linux kernel's spi-fsl-lpspi driver caused by an improper teardown order. The issue arises because the SPI controller is registered with devm_spi_register_controller(), delaying unregistration until after the remove function returns, while DMA channels are torn down synchronously during removal. This can lead to a NULL pointer dereference during an ongoing SPI transfer.
References
- git.kernel.org/stable/c/fbe6f40caeebb0b1ea9dfedc259124c1d3cda7a6 (opens in a new tab)
- git.kernel.org/stable/c/ca4483f36ac1b62e69f8b182c5b8f059e0abecfb (opens in a new tab)
- git.kernel.org/stable/c/e3fd54f8b0317fbccc103961ddd660f2a32dcf0b (opens in a new tab)
- git.kernel.org/stable/c/adb25339b66112393fd6892ceff926765feb5b86 (opens in a new tab)
- git.kernel.org/stable/c/d5d01f24bc6fbde40b4e567ef9160194b61267bc (opens in a new tab)
- git.kernel.org/stable/c/e89e2b97253c124d37bf88e96e5e8ce5c3aeeec3 (opens in a new tab)
- git.kernel.org/stable/c/15650dfbaeeb14bcaaf053b93cf631db8d465300 (opens in a new tab)
- git.kernel.org/stable/c/b341c1176f2e001b3adf0b47154fc31589f7410e (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)