VulnerabilityPublished 6 Oct 2026Updated 6 Nov 2026

CVE-2026-98177: Linux kernel · drm/amdkfd: Avoid integer underflow in EOP ring size calculation.

Source GCVE Database

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Authoritative record:CVE-2026-98177· Low

Not known to be exploited · fixed in 287a34c4d712e0bdb67751e21316d9c8d75a528a : update Linux kernel when convenient.

Data as of 6 Nov 2026, 19:33 UTC

Severity

Low

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in 287a34c4d712e0bdb67751e21316d9c8d75a528a, 8ee521b8b189799e361d4233c5180ba56656d4d4, 3c97f7cb6c48826663648b6081b614c2befc8ac7

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Oct 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 6 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.

ghsa-w77g-jh5m-m588

What to do

Upgrade Linux kernel to 287a34c4d712e0bdb67751e21316d9c8d75a528a, 8ee521b8b189799e361d4233c5180ba56656d4d4 or 3c97f7cb6c48826663648b6081b614c2befc8ac7.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d696d536f0a97ac779d6176107ac4e96d0a2f8b9, < 287a34c4d712e0bdb67751e21316d9c8d75a528a	Fixed in 287a34c4d712e0bdb67751e21316d9c8d75a528a
LinuxLinux	Affected ≥ d696d536f0a97ac779d6176107ac4e96d0a2f8b9, < 8ee521b8b189799e361d4233c5180ba56656d4d4	Fixed in 8ee521b8b189799e361d4233c5180ba56656d4d4
LinuxLinux	Affected ≥ d696d536f0a97ac779d6176107ac4e96d0a2f8b9, < 3c97f7cb6c48826663648b6081b614c2befc8ac7	Fixed in 3c97f7cb6c48826663648b6081b614c2befc8ac7
LinuxLinux	Affected =4.3	Fixed in–

AI-suggested

A fix has been applied in the Linux kernel source code via commit f0f43fcf8b2b3a924cad9444340921c96ed5f634 that corrects the calculation to prevent integer underflow. Users should update to a kernel version that includes this commit to remediate the vulnerability.

Description

A vulnerability in the Linux kernel's drm/amdkfd component could cause an integer underflow in the calculation of the EOP ring size. The issue arises from the calculation of the base-2 logarithm of the ring size, which could theoretically underflow due to the use of order_base_2 on a value that can be zero. This has been corrected by adjusting the calculation to avoid underflow and clarifying the mathematical explanation.

Impact

The vulnerability could lead to an integer underflow in the EOP ring size calculation within the drm/amdkfd kernel driver. While the practical impact is limited by the minimum ring buffer size, the flaw could potentially cause incorrect ring size computation, which might affect kernel stability or driver operation. No known exploits or active exploitation in the wild have been reported.

Summary

The Linux kernel's drm/amdkfd driver contained a vulnerability where the low 6 bits of cp_hqd_eop_control stored the base-2 logarithm of the EOP ring size, calculated as order_base_2(q->eop_ring_buffer_size / 4) - 1. Since order_base_2 can return 0, this calculation could underflow, although in practice the ring buffer size is never less than 4096. The fix changes the calculation to order_base_2(q->eop_ring_buffer_size / 8), leveraging logarithmic properties to avoid underflow. This fix was applied via commit f0f43fcf8b2b3a924cad9444340921c96ed5f634.

References

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