VulnerabilityPublished 14 Jan 2026Updated 5 Nov 2026

CVE-2025-71122: Linux kernel · iommufd/selftest: Check for overflow in IOMMU_TEST_OP_ADD_RESERVED

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e6c122cffcbb2e84d321ec8ba0e38ce8e7c10925 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 23:24 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

EPSS

0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in e6c122cffcbb2e84d321ec8ba0e38ce8e7c10925, e6a973af11135439de32ece3b9cbe3bfc043bea8, b166b8e0a381429fefd9180e67fbc834b3cee82f +1

Exploitation evidence

Disclosed: evidence found.
CVE published 14 Jan 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 5 Nov 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.

What to do

Upgrade Linux kernel to e6c122cffcbb2e84d321ec8ba0e38ce8e7c10925, e6a973af11135439de32ece3b9cbe3bfc043bea8, b166b8e0a381429fefd9180e67fbc834b3cee82f or 4cc829d61f10c20523fd4085c1546e741a792a97.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f4b20bb34c83dceade5470288f48f94ce3598ada, < e6c122cffcbb2e84d321ec8ba0e38ce8e7c10925	Fixed in e6c122cffcbb2e84d321ec8ba0e38ce8e7c10925
LinuxLinux	Affected ≥ f4b20bb34c83dceade5470288f48f94ce3598ada, < e6a973af11135439de32ece3b9cbe3bfc043bea8	Fixed in e6a973af11135439de32ece3b9cbe3bfc043bea8
LinuxLinux	Affected ≥ f4b20bb34c83dceade5470288f48f94ce3598ada, < b166b8e0a381429fefd9180e67fbc834b3cee82f	Fixed in b166b8e0a381429fefd9180e67fbc834b3cee82f
LinuxLinux	Affected ≥ f4b20bb34c83dceade5470288f48f94ce3598ada, < 4cc829d61f10c20523fd4085c1546e741a792a97	Fixed in 4cc829d61f10c20523fd4085c1546e741a792a97
LinuxLinux	Affected =6.2	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: iommufd/selftest: Check for overflow in IOMMU_TEST_OP_ADD_RESERVED syzkaller found it could overflow math in the test infrastructure and cause a WARN_ON by corrupting the reserved interval tree. This only effects test kernels with CONFIG_IOMMUFD_TEST. Validate the user input length in the test ioctl.

References

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