CVE-2024-40963

Kernel panic via unchecked zero CBR address

Published Jul 12, 2024 · Updated May 23, 2026

Denial of service in affected Linux kernel versions allows local users to trigger a kernel panic during DMA synchronization. In arch/mips/bmips/setup.c, bcm6358_quirks fails to disable RAC flushing when TP1 boot leaves BMIPS_GET_CBR() at zero, so arch_sync_dma_for_cpu_all accesses an invalid register base. Reachability requires a BCM6358 MIPS device booted from TP1 with an uninitialized CBR address; the documented consequence is a kernel panic.

CVSS severity5.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Linux kernel versions allows local users to trigger a kernel panic during DMA synchronization. In arch/mips/bmips/setup.c, bcm6358_quirks fails to disable RAC flushing when TP1 boot leaves BMIPS_GET_CBR() at zero, so arch_sync_dma_for_cpu_all accesses an invalid register base. Reachability requires a BCM6358 MIPS device booted from TP1 with an uninitialized CBR address; the documented consequence is a kernel panic.

The record

CVE
CVE-2024-40963
Published
Jul 12, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-754, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=288c96aa5b5526cd4a946e84ef85e165857693b5
  2. Affected versionversion=2cdbcff99f15db86a10672fb220379a1ae46ccae <6c0f6ccd939166f56a904c792d7fcadae43b9085
  3. Affected versionversion=47a449ec09b4479b89dcc6b27ec3829fc82ffafb <36d771ce6028b886e18a4a8956a5d23688e4e13d
  4. Affected versionversion=5.10.177 <5.10.221
  5. Affected versionversion=5.15.106 <5.15.162
  6. Affected versionversion=5.4.240 <5.4.279
  7. Affected versionversion=6.1.23 <6.1.96
  8. Affected versionversion=6.2.10 <6.3
  9. Affected versionversion=6.3
  10. Affected versionversion=65b723644294f1d79770704162c0e8d1f700b6f1 <89167072fd249e5f23ae2f8093f87da5925cef27
  11. Affected versionversion=ab327f8acdf8d06601fbf058859a539a9422afff <2cd4854ef14a487bcfb76c7980675980cad27b52
  12. Affected versionversion=ab327f8acdf8d06601fbf058859a539a9422afff <ce5cdd3b05216b704a704f466fb4c2dff3778caf
  13. Affected versionversion=ab327f8acdf8d06601fbf058859a539a9422afff <da895fd6da438af8d9326b8f02d715a9c76c3b5b
  14. Affected versionversion=d65de5ee8b72868fbbbd39ca73017d0e526fa13a <10afe5f7d30f6fe50c2b1177549d0e04921fc373

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=288c96aa5b5526cd4a946e84ef85e165857693b5; version=2cdbcff99f15db86a10672fb220379a1ae46ccae <6c0f6ccd939166f56a904c792d7fcadae43b9085; version=47a449ec09b4479b89dcc6b27ec3829fc82ffafb <36d771ce6028b886e18a4a8956a5d23688e4e13d; version=5.10.177 <5.10.221; version=5.15.106 <5.15.162; version=5.4.240 <5.4.279; version=6.1.23 <6.1.96; version=6.2.10 <6.3; version=6.3; version=65b723644294f1d79770704162c0e8d1f700b6f1 <89167072fd249e5f23ae2f8093f87da5925cef27; version=ab327f8acdf8d06601fbf058859a539a9422afff <2cd4854ef14a487bcfb76c7980675980cad27b52; version=ab327f8acdf8d06601fbf058859a539a9422afff <ce5cdd3b05216b704a704f466fb4c2dff3778caf; version=ab327f8acdf8d06601fbf058859a539a9422afff <da895fd6da438af8d9326b8f02d715a9c76c3b5b; version=d65de5ee8b72868fbbbd39ca73017d0e526fa13a <10afe5f7d30f6fe50c2b1177549d0e04921fc373

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.

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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-754Improper Check for Unusual or Exceptional Conditions
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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