CVE-2022-48845

Service disruption via late CPU topology mapping

Published Jul 16, 2024 · Updated May 11, 2026

Incorrect CPU topology initialization in the Linux kernel allows local users to disrupt availability on affected MIPS systems. arch/mips/kernel/smp.c called set_cpu_sibling_map() only after notify_cpu_start(), so sched_core_cpu_starting() consumed an empty sibling mask. The condition requires CONFIG_SCHED_CORE and a CPS-driven, two-core, two-thread-per-core interAptiv processor; the published reproducer shows a boot-time warning rather than data access or modification.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect CPU topology initialization in the Linux kernel allows local users to disrupt availability on affected MIPS systems. arch/mips/kernel/smp.c called set_cpu_sibling_map() only after notify_cpu_start(), so sched_core_cpu_starting() consumed an empty sibling mask. The condition requires CONFIG_SCHED_CORE and a CPS-driven, two-core, two-thread-per-core interAptiv processor; the published reproducer shows a boot-time warning rather than data access or modification.

The record

CVE
CVE-2022-48845
Published
Jul 16, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 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=2.6.28
  2. Affected versionversion=e545a6140b698b2494daf0b32107bdcc5e901390 <32813321f18d5432cec1b1a6ecc964f9ea26d565
  3. Affected versionversion=e545a6140b698b2494daf0b32107bdcc5e901390 <56eaacb8137ba2071ce48d4e3d91979270e139a7
  4. Affected versionversion=e545a6140b698b2494daf0b32107bdcc5e901390 <7315f8538db009605ffba00370678142ef00ac98
  5. Affected versionversion=e545a6140b698b2494daf0b32107bdcc5e901390 <94647aec80d03d6914aa664b7b8e103cd9d63239
  6. Affected versionversion=e545a6140b698b2494daf0b32107bdcc5e901390 <be538b764a46be1d0700fd3b6e82fb76bd17f13a
  7. Affected versionversion=e545a6140b698b2494daf0b32107bdcc5e901390 <c2420bc3333111184cdcb112282d13afe1338dd7
  8. Affected versionversion=e545a6140b698b2494daf0b32107bdcc5e901390 <e8ad9ecc406974deb5e7c070f51cc1d09d21dc4b
  9. Affected versionversion=e545a6140b698b2494daf0b32107bdcc5e901390 <f2703def339c793674010cc9f01bfe4980231808

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.28; version=e545a6140b698b2494daf0b32107bdcc5e901390 <32813321f18d5432cec1b1a6ecc964f9ea26d565; version=e545a6140b698b2494daf0b32107bdcc5e901390 <56eaacb8137ba2071ce48d4e3d91979270e139a7; version=e545a6140b698b2494daf0b32107bdcc5e901390 <7315f8538db009605ffba00370678142ef00ac98; version=e545a6140b698b2494daf0b32107bdcc5e901390 <94647aec80d03d6914aa664b7b8e103cd9d63239; version=e545a6140b698b2494daf0b32107bdcc5e901390 <be538b764a46be1d0700fd3b6e82fb76bd17f13a; version=e545a6140b698b2494daf0b32107bdcc5e901390 <c2420bc3333111184cdcb112282d13afe1338dd7; version=e545a6140b698b2494daf0b32107bdcc5e901390 <e8ad9ecc406974deb5e7c070f51cc1d09d21dc4b; version=e545a6140b698b2494daf0b32107bdcc5e901390 <f2703def339c793674010cc9f01bfe4980231808

Published CVSS scores

5.5NIST NVDCVSS: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

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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