CVE-2024-26766

Kernel panic via SDMA descriptor overflow

Published Apr 3, 2024 · Updated Aug 5, 2026

Out-of-bounds write in Linux kernel hfi1 SDMA handling allows local users to trigger a kernel panic through a crafted sendmsg call. The _pad_sdma_tx_descs() check fails to expand the six-entry descriptor array when an SDMA send needs dword padding, so a seventh descriptor overwrites the containing transmit request. Any unprivileged local account that can send through an hfi1 IPoIB interface can corrupt adjacent kernel fields, causing a panic during send completion.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds write in Linux kernel hfi1 SDMA handling allows local users to trigger a kernel panic through a crafted sendmsg call. The _pad_sdma_tx_descs() check fails to expand the six-entry descriptor array when an SDMA send needs dword padding, so a seventh descriptor overwrites the containing transmit request. Any unprivileged local account that can send through an hfi1 IPoIB interface can corrupt adjacent kernel fields, causing a panic during send completion.

The record

CVE
CVE-2024-26766
Published
Apr 3, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-193, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0ef9594936d1f078e8599a1cf683b052df2bec00
  2. Affected versionversion=40ac5cb6cbb01afa40881f78b4d2f559fb7065c4 <5833024a9856f454a964a198c63a57e59e07baf5
  3. Affected versionversion=4.19.291 <4.19.308
  4. Affected versionversion=5.10.188 <5.10.211
  5. Affected versionversion=5.15.99 <5.15.150
  6. Affected versionversion=5.4.251 <5.4.270
  7. Affected versionversion=6.1.16 <6.1.80
  8. Affected versionversion=6.2.3 <6.3
  9. Affected versionversion=6.3
  10. Affected versionversion=6cf8f3d690bb5ad31ef0f41a6206ecf5a068d179 <3f38d22e645e2e994979426ea5a35186102ff3c2
  11. Affected versionversion=bd57756a7e43c7127d0eca1fc5868e705fd0f7ba <47ae64df23ed1318e27bd9844e135a5e1c0e6e39
  12. Affected versionversion=d1c1ee052d25ca23735eea912f843bc7834781b4 <115b7f3bc1dce590a6851a2dcf23dc1100c49790
  13. Affected versionversion=eeaf35f4e3b360162081de5e744cf32d6d1b0091 <52dc9a7a573dbf778625a0efca0fca55489f084b
  14. Affected versionversion=fd8958efe8779d3db19c9124fce593ce681ac709 <9034a1bec35e9f725315a3bb6002ef39666114d9
  15. Affected versionversion=fd8958efe8779d3db19c9124fce593ce681ac709 <a2fef1d81becf4ff60e1a249477464eae3c3bc2a
  16. Affected versionversion=fd8958efe8779d3db19c9124fce593ce681ac709 <e6f57c6881916df39db7d95981a8ad2b9c3458d6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0ef9594936d1f078e8599a1cf683b052df2bec00; version=40ac5cb6cbb01afa40881f78b4d2f559fb7065c4 <5833024a9856f454a964a198c63a57e59e07baf5; version=4.19.291 <4.19.308; version=5.10.188 <5.10.211; version=5.15.99 <5.15.150; version=5.4.251 <5.4.270; version=6.1.16 <6.1.80; version=6.2.3 <6.3; version=6.3; version=6cf8f3d690bb5ad31ef0f41a6206ecf5a068d179 <3f38d22e645e2e994979426ea5a35186102ff3c2; version=bd57756a7e43c7127d0eca1fc5868e705fd0f7ba <47ae64df23ed1318e27bd9844e135a5e1c0e6e39; version=d1c1ee052d25ca23735eea912f843bc7834781b4 <115b7f3bc1dce590a6851a2dcf23dc1100c49790; version=eeaf35f4e3b360162081de5e744cf32d6d1b0091 <52dc9a7a573dbf778625a0efca0fca55489f084b; version=fd8958efe8779d3db19c9124fce593ce681ac709 <9034a1bec35e9f725315a3bb6002ef39666114d9; version=fd8958efe8779d3db19c9124fce593ce681ac709 <a2fef1d81becf4ff60e1a249477464eae3c3bc2a; version=fd8958efe8779d3db19c9124fce593ce681ac709 <e6f57c6881916df39db7d95981a8ad2b9c3458d6

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-193Off-by-one Error
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo