VulnerabilityPublished 11 Sep 2026Updated 5 Oct 2026

CVE-2026-89592: Linux kernel · accel/rocket: fix NULL dereference and integer overflow in rocket_job_push()

Affects Linux kernelSource GCVE Database

Not known to be exploited.

Data as of 26 Oct 2026, 12:55 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 11 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.

ghsa-37xg-5m8h-6hgw

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

A fix is available that addresses the integer overflow and NULL pointer dereference by validating input counts and checking allocation success. Users should apply the official patches or update to fixed kernel versions to remediate this vulnerability.

Description

A vulnerability in the Linux kernel's accel/rocket component was fixed to address a NULL pointer dereference and an integer overflow in the rocket_job_push() function. The function allocates a temporary array based on user-supplied counts without proper validation, leading to potential kernel crashes or out-of-bounds memory access. The fix adds overflow checks and NULL pointer validation to prevent these issues.

Impact

If exploited, this vulnerability could cause kernel NULL pointer dereference leading to system crashes (denial of service) or out-of-bounds memory accesses, potentially destabilizing the system or causing undefined behavior. There is no evidence of known exploits in the wild.

Summary

The Linux kernel's rocket_job_push() function in the accel/rocket subsystem had two bugs: first, it lacked a NULL check after kvmalloc_array() allocation, which could cause a NULL pointer dereference if allocation failed. Second, it did not validate the sum of in_bo_count and out_bo_count, both derived from untrusted userspace input, leading to an integer overflow in the allocation size calculation. This overflow could cause the allocation to be smaller than needed, resulting in out-of-bounds accesses when copying and locking GEM objects. The vulnerability was fixed by adding check_add_overflow() to detect count overflow before allocation and adding a NULL check on the allocation result.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Oct 2026, 02:27 UTC

Technical details

References

Community reviews

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