CVE-2026-93828: Linux kernel · exfat: fix handling of damaged volume in exfat_create_upcase_table()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Sep 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
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 fix is available that addresses this vulnerability by changing the handling of zero-sized upcase tables in the exFAT driver. Users should update to patched Linux kernel versions that include this fix. No additional mitigation is required once the fix is applied.
Description
A vulnerability in the Linux kernel's exFAT filesystem driver was resolved that involved improper handling of damaged volumes in the exfat_create_upcase_table() function. When the upcase table size is zero due to corrupted media or device issues, an integer overflow caused an infinite loop. The fix ensures that if the upcase table size is zero or missing, the system falls back to a default table or marks the volume read-only to prevent looping.
References
- ubuntu.com/security/CVE-2026-93828 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93828 (opens in a new tab)
- git.kernel.org/stable/c/2cc0b612343638057ef321ce735201a7c2f52f25 (opens in a new tab)
- git.kernel.org/stable/c/20dd3185d13865214ff25b0bf7b931e8d73be1ac (opens in a new tab)
- git.kernel.org/stable/c/60ace93811609e4dd883e9de5fb4462ed834160a (opens in a new tab)