VulnerabilityPublished 16 Sep 2026Updated 5 Oct 2026

CVE-2026-89978: Linux kernel · accel/amdxdna: return early from a zero-length flush

Affects Linux kernelSource GCVE Database

Not known to be exploited.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 16 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

Affected software

Product	Affected	Fixed in
Ubuntu 26.04 LTSlinux`pkg:deb/ubuntu/linux?arch=source&distro=resolute`Other threats	Affected 6.17.0-5.5 – 7.0.0-38.38 23 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-aws`pkg:deb/ubuntu/linux-aws?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1014.14 15 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure`pkg:deb/ubuntu/linux-azure?arch=source&distro=resolute`Other threats	Affected 6.17.0-1003.3 – 7.0.0-1017.17 15 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure-fde`pkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resolute`Other threats	Affected 7.0.0-1003.3 – 7.0.0-1016.16 9 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gcp`pkg:deb/ubuntu/linux-gcp?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1014.14 13 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gke`pkg:deb/ubuntu/linux-gke?arch=source&distro=resolute`Other threats	Affected 7.0.0-1002.3 – 7.0.0-1008.9 6 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

The vulnerability has been resolved in the Linux kernel. Users should apply the official kernel updates that fix this issue. Since the vendor advisory or patch links are not provided, check the Linux kernel or distribution vendor advisories for the specific fixed versions and update accordingly.

Description

A vulnerability in the Linux kernel's amdxdna driver allows a zero-length flush SYNC_BO request to cause a kernel page fault. This occurs because the flush operation does not properly constrain the size, leading to an access in a guard page below the vmalloc area and resulting in a kernel oops. Any process with access to the render node can trigger this fault by issuing a SYNC_BO call with size zero on an AMDXDNA_BO_SHARE object. This issue has been reproduced reliably on specific hardware.

Impact

Exploitation of this vulnerability causes a kernel page fault and an oops, which can lead to denial of service by crashing the kernel or destabilizing the system. Any process with permission to open the render node can trigger this fault. There is no indication of privilege escalation or arbitrary code execution from the provided data.

Summary

The Linux kernel's amdxdna driver contained a vulnerability where a zero-length flush SYNC_BO request bypassed size constraints, causing drm_clflush_virt_range() to perform an unconditional cache flush on an invalid memory address just before the mapped region. This leads to a kernel page fault (BUG) due to accessing a guard page below the vmalloc area. The flaw affects processes that can open the render node and invoke the SYNC_BO ioctl with zero size on AMDXDNA_BO_SHARE objects. The import arm of the driver handles this case differently and does not fault. The vulnerability was reproducible on a Strix Point NPU (1022:17f0).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Oct 2026, 20:36 UTC

Technical details

References

Community reviews

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