VulnerabilityPublished 26 Oct 2026Updated 28 Oct 2026

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

Affects Linux kernelSource GCVE Database

Authoritative record:CVE-2026-99098· Low

Not known to be exploited.

Data as of 29 Oct 2026, 00:58 UTC

Severity

Low

Rated by Threat Radar · CVSS not yet scored by NVD

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

Affected software

Product	Affected	Fixed in
Ubuntu 26.10linux`pkg:deb/ubuntu/linux?arch=source&distro=stonking`Other threats	Affected 7.0.0-14.14 – 7.3.0-9.9 6 affected builds	Fixed in–
Ubuntu 26.10linux-aws`pkg:deb/ubuntu/linux-aws?arch=source&distro=stonking`Other threats	Affected 7.0.0-1004.4 – 7.3.0-1003.3 5 affected builds	Fixed in–
Ubuntu 26.10linux-azure`pkg:deb/ubuntu/linux-azure?arch=source&distro=stonking`Other threats	Affected 7.0.0-1004.4 – 7.3.0-1003.3 5 affected builds	Fixed in–
Ubuntu 26.10linux-azure-fde`pkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonking`Other threats	Affected =7.0.0-1004.4 =7.3.0-1002.3 =7.3.0-1003.4	Fixed in–
Ubuntu 26.10linux-gcp`pkg:deb/ubuntu/linux-gcp?arch=source&distro=stonking`Other threats	Affected 7.0.0-1003.3 – 7.3.0-1003.3 5 affected builds	Fixed in–
Ubuntu 26.10linux-oracle`pkg:deb/ubuntu/linux-oracle?arch=source&distro=stonking`Other threats	Affected 7.0.0-1003.3 – 7.3.0-1003.3 5 affected builds	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 enlarges the checksum buffers to accommodate large tag sizes, preventing the buffer overflow and kernel panic. Users should apply the updated Linux kernel versions that include this patch. Since exploitation requires root privileges, standard privilege management and limiting root access remain important.

Description

A buffer overflow vulnerability in the Linux kernel's dm-integrity module was fixed. The issue occurs in inline mode when the tag size is larger than the on-stack buffer used for checksums, causing padding to overflow the buffer. This overflow can trigger a kernel panic with stack protection enabled. The flaw requires root privileges to exploit and does not pose a direct security risk to unprivileged users.

Impact

The vulnerability can cause a kernel panic when the dm-integrity module operates in inline mode with an unusually large tag size, potentially leading to denial of service. However, exploitation requires root privileges, limiting the security impact. There is no indication of privilege escalation or arbitrary code execution from this flaw.

Summary

The Linux kernel's dm-integrity module had a buffer overflow vulnerability in inline mode with large tag sizes. The functions dm_integrity_check and dm_integrity_inline_recheck compute checksums into a fixed-size on-stack buffer of HASH_MAX_DIGESTSIZE bytes. When the tag size exceeds this buffer size, padding in integrity_sector_checksum writes beyond the buffer boundary, causing a buffer overflow. This leads to kernel panics under CONFIG_STACKPROTECTOR. The issue was addressed by enlarging the buffers to MAX_TAG_SIZE bytes, consistent with prior fixes for integrity_metadata. This vulnerability requires root access to trigger and thus is not considered a security bug.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Oct 2026, 00:58 UTC

Technical details

References

Community reviews

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