CVE-2026-74276: Linux kernel · spi: xilinx: use FIFO occupancy register to determine buffer size
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, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% 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 corrects the FIFO size determination logic in the xilinx SPI driver. Users should apply the official Linux kernel updates that include this fix. No additional mitigations are required once the patch is applied.
Description
A vulnerability in the Linux kernel's xilinx SPI driver caused incorrect determination of the FIFO buffer size, leading to a potential infinite loop and driver lockup when operating in interrupt mode. The issue arises because the driver overestimates the FIFO size by one due to the presence of a shift register, causing a mismatch in RX FIFO handling. This flaw has been fixed by correcting the FIFO size calculation logic.
References
- nvd.nist.gov/vuln/detail/CVE-2026-74276 (opens in a new tab)
- git.kernel.org/stable/c/1c9246a199e19b2fd36e94feed60e55f27103a4f (opens in a new tab)
- git.kernel.org/stable/c/1fc6a6c0cc7796b0c1cf4eec3f0720f422f09273 (opens in a new tab)
- git.kernel.org/stable/c/47f3b5365536e8c38f264824ab15fdb74454e066 (opens in a new tab)
- git.kernel.org/stable/c/4ee65558a7fda463222f5edc631b6d7862218725 (opens in a new tab)
- git.kernel.org/stable/c/d1944b71c18e7494756bff1a6f80c25be99eaecb (opens in a new tab)
- git.kernel.org/stable/c/d7ccd8736b67550eca746ed7fa39a36016ff114b (opens in a new tab)
- git.kernel.org/stable/c/dfab0d4698a642bab9b895e2e6d240838cfe2cc6 (opens in a new tab)
- git.kernel.org/stable/c/e98f589d54068dfcc7da42d9b730e47b84e2991a (opens in a new tab)
- ubuntu.com/security/CVE-2026-74276 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-74276 (opens in a new tab)
- git.kernel.org/linus/47f3b5365536e8c38f264824ab15fdb74454e066 (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)