CVE-2025-68773: Linux kernel · spi: fsl-cpm: Check length parity before switching to 16 bit mode
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 6.8.0-1052.55~22.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 16:05 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 6.8.0-1052.55~22.04.1, 6.8.0-1059.65~22.04.1, 6.8.0-1058.65~22.04.1 +43
Exploitation evidence
Disclosed: evidence found.
CVE published 13 Jan 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 25.10linuxpkg:deb/ubuntu/linux?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=questingOther 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. The issue is fixed by verifying length parity before switching to 16-bit mode in the fsl-cpm SPI driver. Users should update to the fixed Linux kernel versions as provided by their distribution. After updating, a system reboot is required to apply the changes.
Description
A vulnerability in the Linux kernel's spi: fsl-cpm driver was fixed by adding a check for length parity before switching to 16-bit mode. Previously, the driver assumed the transfer size was even without verification, which could lead to a buffer overrun when the transfer size was odd. This issue became apparent after changes to the eeprom driver introduced dynamically allocated bounce buffers matching the transfer size. The fix ensures the driver remains in 8-bit mode if the length is not even, preventing the overrun.
References
- ubuntu.com/security/CVE-2025-68773 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-68773 (opens in a new tab)
- git.kernel.org/linus/1417927df8049a0194933861e9b098669a95c762 (opens in a new tab)
- git.kernel.org/stable/c/1417927df8049a0194933861e9b098669a95c762 (opens in a new tab)
- git.kernel.org/stable/c/3dd6d01384823e1bd8602873153d6fc4337ac4fe (opens in a new tab)
- git.kernel.org/stable/c/743cebcbd1b2609ec5057ab474979cef73d1b681 (opens in a new tab)
- git.kernel.org/stable/c/837a23a11e0f734f096c7c7b0778d0e625e3dc87 (opens in a new tab)
- git.kernel.org/stable/c/be0b613198e6bfa104ad520397cab82ad3ec1771 (opens in a new tab)
- ubuntu.com/security/notices/USN-8177-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8179-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8177-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8183-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8184-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8179-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8185-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8183-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8179-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8203-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8204-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8185-2 (opens in a new tab)