HOMEVULNERABILITIESCVE-2026-43253
HIGH

CVE-2026-43253

Published: May 6, 2026· Updated: May 11, 2026

7.5
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:4.9th

Official Description

In the Linux kernel, the following vulnerability has been resolved:

iommu/amd: move wait_on_sem() out of spinlock

With iommu.strict=1, the existing completion wait path can cause soft

lockups under stressed environment, as wait_on_sem() busy-waits under the

spinlock with interrupts disabled.

Move the completion wait in iommu_completion_wait() out of the spinlock.

wait_on_sem() only polls the hardware-updated cmd_sem and does not require

iommu->lock, so holding the lock during the busy wait unnecessarily

increases contention and extends the time with interrupts disabled.

NVD Source

Technical Analysis

CVE-2026-43253 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Linux1 product
linux kernel
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5
PATCHhttps://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324
PATCHhttps://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf
PATCHhttps://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0
PATCHhttps://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58

All References (5)

→
https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5Patch
→
https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324Patch
→
https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bfPatch
→
https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0Patch
→
https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58Patch

Quick Facts

CVE IDCVE-2026-43253
CVSS Score7.5 / 10
SeverityHIGH
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMay 6, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-43253 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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