VulnerabilityPublished 24 Sep 2026Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

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

Data as of 26 Oct 2026, 17:16 UTC

Severity

Unrated

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.
Patch: Available – fixed in 29723256fccf46e55c2a44bd6b8345bef7ba079b, 60ace93811609e4dd883e9de5fb4462ed834160a, 20dd3185d13865214ff25b0bf7b931e8d73be1ac +1

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.

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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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.

What to do

Upgrade Linux kernel to 29723256fccf46e55c2a44bd6b8345bef7ba079b, 60ace93811609e4dd883e9de5fb4462ed834160a, 20dd3185d13865214ff25b0bf7b931e8d73be1ac or 2cc0b612343638057ef321ce735201a7c2f52f25.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 370e812b3ec190fa492c9fd5a80c38b086d105c0, < 29723256fccf46e55c2a44bd6b8345bef7ba079b	Fixed in 29723256fccf46e55c2a44bd6b8345bef7ba079b
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–

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.

References

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