CVE-2024-49933

Service interruption via unchecked blk_iocost shift exponent

Published Oct 21, 2024 · Updated May 11, 2026

Undefined shift behavior in the Linux kernel blk_iocost controller allows local users to interrupt service through I/O cost activity. ioc_forgive_debts() uses an exponent derived from debt calculations in two u64 shift operations without first limiting it to 63 bits. Triggering requires local low-privileged access, and the upstream record reports UBSAN faults without identifying a demonstrated consequence beyond the undefined operation.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Undefined shift behavior in the Linux kernel blk_iocost controller allows local users to interrupt service through I/O cost activity. ioc_forgive_debts() uses an exponent derived from debt calculations in two u64 shift operations without first limiting it to 63 bits. Triggering requires local low-privileged access, and the upstream record reports UBSAN faults without identifying a demonstrated consequence beyond the undefined operation.

The record

CVE
CVE-2024-49933
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.10
  2. Affected versionversion=bec02dbbafad534674309f8b948094900f456797 <1ab2cfe19700fb3dde4c7dfec392acff34db3120
  3. Affected versionversion=bec02dbbafad534674309f8b948094900f456797 <1b120f151871eb47ce9f283c007af3f8ae1d990e
  4. Affected versionversion=bec02dbbafad534674309f8b948094900f456797 <1f61d509257d6a05763d05bf37943b35306522b1
  5. Affected versionversion=bec02dbbafad534674309f8b948094900f456797 <364022095bdd4108efdaaa68576afa4712a5d085
  6. Affected versionversion=bec02dbbafad534674309f8b948094900f456797 <59121bb38fdc01434ea3fe361ee02b59f036227f
  7. Affected versionversion=bec02dbbafad534674309f8b948094900f456797 <9bce8005ec0dcb23a58300e8522fe4a31da606fa
  8. Affected versionversion=bec02dbbafad534674309f8b948094900f456797 <f4ef9bef023d5c543cb0f3194ecacfd47ef590ec

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=bec02dbbafad534674309f8b948094900f456797 <1ab2cfe19700fb3dde4c7dfec392acff34db3120; version=bec02dbbafad534674309f8b948094900f456797 <1b120f151871eb47ce9f283c007af3f8ae1d990e; version=bec02dbbafad534674309f8b948094900f456797 <1f61d509257d6a05763d05bf37943b35306522b1; version=bec02dbbafad534674309f8b948094900f456797 <364022095bdd4108efdaaa68576afa4712a5d085; version=bec02dbbafad534674309f8b948094900f456797 <59121bb38fdc01434ea3fe361ee02b59f036227f; version=bec02dbbafad534674309f8b948094900f456797 <9bce8005ec0dcb23a58300e8522fe4a31da606fa; version=bec02dbbafad534674309f8b948094900f456797 <f4ef9bef023d5c543cb0f3194ecacfd47ef590ec

Published CVSS scores

5.5NVDCVSS: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

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

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Your stack

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