VulnerabilityPublished 24 Sep 2026Updated 30 Oct 2026

CVE-2026-93828: Linux kernel · exfat: fix handling of damaged volume in exfat_create_upcase_table()

Source GCVE Database

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Authoritative record:CVE-2026-93828· Medium

Not known to be exploited · fixed in 29723256fccf46e55c2a44bd6b8345bef7ba079b : update Linux kernel when convenient.

Data as of 30 Oct 2026, 17:53 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in 29723256fccf46e55c2a44bd6b8345bef7ba079b, 091ca992218105a050af0b863337e02a2d518b2f, 60ace93811609e4dd883e9de5fb4462ed834160a +2

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Sep 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 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-crx7-9vj2-jqgc

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 370e812b3ec190fa492c9fd5a80c38b086d105c0, < 29723256fccf46e55c2a44bd6b8345bef7ba079b	Fixed in 29723256fccf46e55c2a44bd6b8345bef7ba079b
LinuxLinux	Affected ≥ 370e812b3ec190fa492c9fd5a80c38b086d105c0, < 091ca992218105a050af0b863337e02a2d518b2f	Fixed in 091ca992218105a050af0b863337e02a2d518b2f
LinuxLinux	Affected ≥ 370e812b3ec190fa492c9fd5a80c38b086d105c0, < 60ace93811609e4dd883e9de5fb4462ed834160a	Fixed in 60ace93811609e4dd883e9de5fb4462ed834160a
LinuxLinux	Affected ≥ 370e812b3ec190fa492c9fd5a80c38b086d105c0, < 20dd3185d13865214ff25b0bf7b931e8d73be1ac	Fixed in 20dd3185d13865214ff25b0bf7b931e8d73be1ac
LinuxLinux	Affected ≥ 370e812b3ec190fa492c9fd5a80c38b086d105c0, < 2cc0b612343638057ef321ce735201a7c2f52f25	Fixed in 2cc0b612343638057ef321ce735201a7c2f52f25
LinuxLinux	Affected =5.7	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to handle zero-sized upcase tables safely by falling back to a default table or marking the volume read-only. Users should apply the updated kernel version containing this fix once available. No additional mitigation is indicated.

Description

A vulnerability in the Linux kernel's exFAT filesystem driver caused an integer overflow leading to an infinite loop when handling a damaged volume with a zero-sized upcase table. The issue occurs if the upcase table size is zero due to corrupted media or device malfunction. The fix involves not attempting to load a zero-sized upcase table and instead falling back to a default table or marking the volume read-only if no valid table is found.

Impact

The vulnerability can cause the exFAT filesystem driver to enter an infinite loop when encountering a damaged volume with a zero-sized upcase table. This may lead to denial of service conditions affecting system stability or responsiveness when mounting or accessing such volumes.

Summary

CVE-2026-93828 addresses a flaw in the Linux kernel's exfat_create_upcase_table() function where an integer overflow occurs if the upcase table size is zero. This can cause the module to loop indefinitely when processing damaged or corrupted volumes. The patch changes the behavior to avoid loading a zero-sized upcase table, falling back to a default table or marking the volume read-only via exfat_fs_error().

References

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