VulnerabilityPublished 26 Oct 2026

CVE-2026-99098: Linux kernel · dm-integrity: fix buffer overflow in inline mode with large tag size

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f49cd7820cd0a96f20e1aa2708adb002124e38a7 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:30 UTC

Severity

Low

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

Patch: Available – fixed in f49cd7820cd0a96f20e1aa2708adb002124e38a7, 764b683a6180fd72c931c13fea98d383506a3475, 4f0ee735dc68e3e6c4dd9a666d7f7047163c4165 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Oct 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 f49cd7820cd0a96f20e1aa2708adb002124e38a7, 764b683a6180fd72c931c13fea98d383506a3475, 4f0ee735dc68e3e6c4dd9a666d7f7047163c4165 or 3c7aad85aeb9e28386672e3a009aa2e61f751b86.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ fb0987682c629c1d2c476f35f6fde405a5e304a4, < f49cd7820cd0a96f20e1aa2708adb002124e38a7	Fixed in f49cd7820cd0a96f20e1aa2708adb002124e38a7
LinuxLinux	Affected ≥ fb0987682c629c1d2c476f35f6fde405a5e304a4, < 764b683a6180fd72c931c13fea98d383506a3475	Fixed in 764b683a6180fd72c931c13fea98d383506a3475
LinuxLinux	Affected ≥ fb0987682c629c1d2c476f35f6fde405a5e304a4, < 4f0ee735dc68e3e6c4dd9a666d7f7047163c4165	Fixed in 4f0ee735dc68e3e6c4dd9a666d7f7047163c4165
LinuxLinux	Affected ≥ fb0987682c629c1d2c476f35f6fde405a5e304a4, < 3c7aad85aeb9e28386672e3a009aa2e61f751b86	Fixed in 3c7aad85aeb9e28386672e3a009aa2e61f751b86
LinuxLinux	Affected =6.11	Fixed in–

AI-suggested

Apply the official Linux kernel patches that enlarge the buffers to MAX_TAG_SIZE as referenced by the fixed commits. Since the vulnerability requires root access to trigger and is fixed in recent commits, updating the kernel to a patched version is the recommended mitigation.

Description

A buffer overflow vulnerability in the Linux kernel's dm-integrity inline mode with large tag sizes has been fixed. The issue occurs because the checksum computation uses an on-stack buffer smaller than the tag size, causing an overflow when the tag size exceeds the buffer size. This overflow can cause kernel panics with stack protection enabled. The vulnerability requires root privileges to trigger and is not considered a security bug. Fixes have been applied in recent kernel commits.

Impact

The buffer overflow can cause kernel panics when reading data with large tag sizes in dm-integrity inline mode, potentially leading to denial of service. However, exploitation requires root privileges, limiting the security impact. No privilege escalation or remote exploitation is indicated.

Summary

In the Linux kernel dm-integrity feature, the functions dm_integrity_check and dm_integrity_inline_recheck compute checksums into an on-stack buffer sized at HASH_MAX_DIGESTSIZE bytes. When the tag size is larger than this buffer, padding in integrity_sector_checksum overflows the buffer. This overflow leads to kernel panics under CONFIG_STACKPROTECTOR on the first read. The buffers have been enlarged to MAX_TAG_SIZE bytes to prevent overflow, following a prior fix for integrity_metadata. Since only root can trigger this overflow, it is not classified as a security vulnerability. The issue affects Linux kernel version 6.11 and has been fixed in specific commits.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 15:04 UTC

Technical details

References

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