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CVE Record

CVE-2024-26712: powerpc/kasan: Fix addr error caused by page alignment

In the Linux kernel, the following vulnerability has been resolved: powerpc/kasan: Fix addr error caused by page alignment In kasan_init_region, when k_start is not page aligned, at the begin of for loop, k_cur = k_start & PAGE_MASK is less than k_start, and then `va = block + k_cur - k_start` is less than block, the addr va is invalid, because the memory address space from va to block is not alloced by memblock_alloc, which will not be reserved by memblock_reserve later, it will be used by other places. As a result, memory overwriting occurs. for example: int __init __weak kasan_init_region(void *start, size_t size) { [...] /* if say block(dcd97000) k_start(feef7400) k_end(feeff3fe) */ block = memblock_alloc(k_end - k_start, PAGE_SIZE); [...] for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) { /* at the begin of for loop * block(dcd97000) va(dcd96c00) k_cur(feef7000) k_start(feef7400) * va(dcd96c00) is less than block(dcd97000), va is invalid */ void *va = block + k_cur - k_start; [...] } [...] } Therefore, page alignment is performed on k_start before memblock_alloc() to ensure the validity of the VA address.

MediumCVSS 4.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-26712 is a Linux kernel PowerPC KASAN initialization bug that can overwrite memory during early setup. The published impact is availability only, requiring local high privileges. It is most urgent for affected PowerPC systems running vulnerable kernels, especially where vendor kernels include KASAN-related code paths.

Executive priority

Schedule remediation through the normal kernel patch cycle unless affected PowerPC systems support critical services. Escalate if vulnerable kernels are used in availability-sensitive environments, because the documented impact is memory overwrite leading to denial of service.

Technical view

In kasan_init_region, a non-page-aligned k_start can make k_cur lower than k_start, causing va to point before the memblock_alloc allocation. That invalid address can later be reused, leading to memory overwrite. The fix aligns k_start before memblock_alloc to keep the virtual address inside allocated memory.

Likely exposure

Exposure appears limited to Linux kernel builds on PowerPC affected by the listed stable ranges or commits. The CVSS vector requires local access with high privileges, so internet-facing remote exploitation is not indicated by the provided sources.

Exploitation context

The source bundle does not report active exploitation, and KEV is false. The CVSS vector is local, low complexity, high privileges, no user interaction, with high availability impact and no stated confidentiality or integrity impact.

Researcher notes

Evidence supports a kernel memory overwrite caused by page-alignment handling in PowerPC KASAN initialization. The source bundle provides fix commits and affected kernel version data, but no exploit report, proof-of-concept, or detailed product matrix beyond Linux and Debian LTS reference material.

Mitigation direction

  • Upgrade to a vendor kernel containing the listed Linux stable fixes.
  • Review Debian LTS guidance if using Debian-packaged kernels.
  • Prioritize affected PowerPC hosts before unrelated architectures.
  • If no vendor package is available, follow vendor kernel backport guidance.
  • Avoid treating unverified commit hashes as proof of remediation.

Validation and detection

  • Inventory PowerPC Linux hosts and running kernel versions.
  • Check vendor advisories or package changelogs for CVE-2024-26712.
  • Compare custom kernels against the referenced stable commits.
  • Confirm whether KASAN-related kernel configuration is present.
  • Track remediation through normal kernel reboot validation.
Prepared
Confidence
high
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2024-26712 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
2ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
4.4CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H0.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

4.4Medium
CVSS 3.1 vector shape for CVE-2024-26712Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux663c0c9496a69f80011205ba3194049bcafd681d, 663c0c9496a69f80011205ba3194049bcafd681d, 663c0c9496a69f80011205ba3194049bcafd681d, 663c0c9496a69f80011205ba3194049bcafd681d, 663c0c9496a69f80011205ba3194049bcafd681d, 663c0c9496a69f80011205ba3194049bcafd681d, 5ce93076d8ee2a0fac3ad4adbd2e91b6197146db, 5.3.6unaffected
LinuxLinux5.4, 0, 5.10.210, 5.15.149, 6.1.79, 6.6.18, 6.7.6, 6.8affected
Weakness

CWE details

No CWE listed

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