CVE-2026-64028

Kernel crash via overlong histogram variable name

Published Jul 19, 2026 · Updated Jul 19, 2026

NULL-pointer dereference in Linux Kernel 6.6.141, 6.12.91, 6.18.33, and 7.0.10 allows local users to crash the kernel. In hist_field_name(), snprintf() truncation returns NULL for a fully qualified VAR_REF or EXPR whose uncapped histogram variable name overflows the output buffer; strcat() and strcmp() callers then dereference it. Reachability depends on permission to configure a tracing histogram with an overlong variable name, and successful exploitation interrupts the running system.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in Linux Kernel 6.6.141, 6.12.91, 6.18.33, and 7.0.10 allows local users to crash the kernel. In hist_field_name(), snprintf() truncation returns NULL for a fully qualified VAR_REF or EXPR whose uncapped histogram variable name overflows the output buffer; strcat() and strcmp() callers then dereference it. Reachability depends on permission to configure a tracing histogram with an overlong variable name, and successful exploitation interrupts the running system.

The record

CVE
CVE-2026-64028
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=0402c60abe769098d77f3b3bd1e29a97922b614b <d6c8b3ebdcdb12b59ad4212acb137cc56cae453d
  2. Affected versionversion=2e8578364061c4e88ae33bc20c2d6f64f365f6a2 <e3f5d42cdc2f167719564693675f1eead81378ea
  3. Affected versionversion=3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0 <be4e99038c1603fa6b329d8ee3e364825e17c353
  4. Affected versionversion=5ec1d1e97de134beed3a5b08235a60fc1c51af96 <576ec047d20b368b43c4d5db98c4f2e0f3c101ec
  5. Affected versionversion=6.12.91 <6.12.92
  6. Affected versionversion=6.18.33 <6.18.34
  7. Affected versionversion=6.6.141 <6.6.142
  8. Affected versionversion=6929e650db8451a9975ac0a631ba2d6e5d1e80ba <915c1254fe0788abddc31095b360e9dc98907a34
  9. Affected versionversion=7.0.10 <7.0.11
  10. Affected versionversion=9399a92989354e34086f9a5c379493217df83c5e <e91687643c440ca3997d67646e6f80b92edc6703
  11. Affected versionversion=dfd1cd57ee6067301841b7b0967c70f910a51150 <37377b39ff86dacbc533275c1155210d4fd5dc91
  12. Affected versionversion=e5c223f46c2e0691461dd97510c15e1f77148872 <0402a1d3ddec565132867337ed44514a09d84728

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0402c60abe769098d77f3b3bd1e29a97922b614b <d6c8b3ebdcdb12b59ad4212acb137cc56cae453d; version=2e8578364061c4e88ae33bc20c2d6f64f365f6a2 <e3f5d42cdc2f167719564693675f1eead81378ea; version=3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0 <be4e99038c1603fa6b329d8ee3e364825e17c353; version=5ec1d1e97de134beed3a5b08235a60fc1c51af96 <576ec047d20b368b43c4d5db98c4f2e0f3c101ec; version=6.12.91 <6.12.92; version=6.18.33 <6.18.34; version=6.6.141 <6.6.142; version=6929e650db8451a9975ac0a631ba2d6e5d1e80ba <915c1254fe0788abddc31095b360e9dc98907a34; version=7.0.10 <7.0.11; version=9399a92989354e34086f9a5c379493217df83c5e <e91687643c440ca3997d67646e6f80b92edc6703; version=dfd1cd57ee6067301841b7b0967c70f910a51150 <37377b39ff86dacbc533275c1155210d4fd5dc91; version=e5c223f46c2e0691461dd97510c15e1f77148872 <0402a1d3ddec565132867337ed44514a09d84728

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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