CVE-2026-98176

drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc

Products / packages Linux

Published 06/10/2026, 08:44:20 UTC

Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:10:34 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

The Linux kernel has an integer underflow vulnerability in the drm/amdkfd module. It occurs when calculating the EOP ring size using ffs, which can return 1 or 0, causing an underflow. The affected versions are Linux kernel versions prior to specific commits.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

4 ranges

Linux version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

14328aa58ce523a59996c5a82681c43ec048cc33 → before 1ab281c7ce2dc5195d337f2c16e22eba356b47f9

git versions

14328aa58ce523a59996c5a82681c43ec048cc33 → before 9e8f43579f849fba0dd1059160f50bd44a767366

git versions

14328aa58ce523a59996c5a82681c43ec048cc33 → before 82e1b8299c6da02ce02185c208d2fdf7572b5ea1

git versions

14328aa58ce523a59996c5a82681c43ec048cc33 → before c883d0a132d430ef7ebb23fd94323be94d0fbdb8

git versions

Other versions: unaffected

Linux · Linux

Linux

6 ranges

Linux version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

5.3

unaffected

0 → before 5.3

semver versions

6.12.117 → through 6.12.*

semver versions

6.18.61 → through 6.18.*

semver versions

7.2.8 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Change this to

ffs(q->eop_ring_buffer_size / sizeof(unsigned int) / 4)

using properties of logarithms.

Linux guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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

drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc

The low 6 bits of cp_hqd_eop_control store the base-2 logarithm of the EOP ring size. This was calculated as

ffs(q->eop_ring_buffer_size / sizeof(unsigned int)) - 1 - 1

But ffs can in theory return 1 or 0, so this could underflow (although in practice the ring buffer size cannot be less than 4096).

Change this to

ffs(q->eop_ring_buffer_size / sizeof(unsigned int) / 4)

using properties of logarithms.

(cherry picked from commit 4f18c56630383c14bfc6b2d65f88f2f895d2121a)

References

4 sources

git.kernel.org/stable/c/1ab281c7ce2dc5195d337f2c16e22eba356b47f9

Source referenceLinux

git.kernel.org/stable/c/9e8f43579f849fba0dd1059160f50bd44a767366

Source referenceLinux

git.kernel.org/stable/c/82e1b8299c6da02ce02185c208d2fdf7572b5ea1

Source referenceLinux

git.kernel.org/stable/c/c883d0a132d430ef7ebb23fd94323be94d0fbdb8

Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied

Version evidence

Remediation guidance · not supplied

Weakness classification · not supplied

Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-98176

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.3

After:

Through (inclusive):

Before: 6.12.117

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.3

After:

Through (inclusive):

Before: 6.18.61

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.3

After:

Through (inclusive):

Before: 7.2.8

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.3

After:

Through (inclusive):

Before: 7.3

Applicability preview

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Contributing organizations · 1

Linux

Assigning organization

2026-11-10

Timeline

All times UTC

6 Oct 2026, 08:44
Advisory published
Publication date supplied by the source.
10 Nov 2026, 18:15
Source updated
Latest modification date supplied by the source.
10 Nov 2026, 18:24
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-981762026-11-10

Observed 2026-11-10T18:24:55.281Z · upstream updated 2026-11-10T18:15:10.994Z

Product or version evidence changed

before

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after

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        "versionType": "semver"
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References changed

before

[
  "https://git.kernel.org/stable/c/9e8f43579f849fba0dd1059160f50bd44a767366",
  "https://git.kernel.org/stable/c/82e1b8299c6da02ce02185c208d2fdf7572b5ea1",
  "https://git.kernel.org/stable/c/c883d0a132d430ef7ebb23fd94323be94d0fbdb8"
]

after

[
  "https://git.kernel.org/stable/c/1ab281c7ce2dc5195d337f2c16e22eba356b47f9",
  "https://git.kernel.org/stable/c/9e8f43579f849fba0dd1059160f50bd44a767366",
  "https://git.kernel.org/stable/c/82e1b8299c6da02ce02185c208d2fdf7572b5ea1",
  "https://git.kernel.org/stable/c/c883d0a132d430ef7ebb23fd94323be94d0fbdb8"
]

Environment requirements changed

before

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after

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Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. No numeric assessment supplied.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: 0.15% estimated probability in the next 30 days. 2026-11-06 · FIRST EPSS.

Record identifiers

Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-98176

Enrichment coverage

NVDAvailable

Checked 07/11/2026, 02:45:32 UTC

GHSAAvailable

Checked 07/11/2026, 02:45:31 UTC

EUVDAvailable

Checked 07/11/2026, 02:45:32 UTC

EPSSAvailable

Checked 07/11/2026, 02:45:32 UTC

Additional source evidence

GitHub Advisory Database · GHSA-mv47-6r4w-p28qChecked 07/11/2026, 02:45:31 UTC

NVD · CVE-2026-98176Checked 07/11/2026, 02:45:32 UTC

ENISA EUVD · EUVD-2026-93104Checked 07/11/2026, 02:45:32 UTC

FIRST EPSS · CVE-2026-98176

EPSS 0.15% probability of exploitation in the next 30 days. Percentile: 4.70% · 2026-11-06

Checked 07/11/2026, 02:45:32 UTC

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc

Severity and exploitation

What this means

Attack conditions

Affected versions

Linux

affected

unaffected

unknown

Linux

affected

unaffected

unknown

What to do

Public exploit evidence

Original source description

References

Inside the record

Evidence available

Original records

Environment requirements

Timeline

Advisory published

Source updated

Last imported by cve.new

What changed