UnratedFix available

powerpc/kasan: Limit KASAN thread size increase to 32KB

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: powerpc/kasan: Limit KASAN thread size increase to 32KB KASAN is seen to increase stack usage, to the point that it was reported to lead to stack overflow on some 32-bit machines (see link). To avoid overflows the stack size was doubled for KASAN builds in commit 3e8635fb2e07 ("powerpc/kasan: Force thread size increase with KASAN"). However with a 32KB stack size to begin with, the doubling leads to a 64KB stack, which causes build errors: arch/powerpc/kernel/switch.S:249: Error: operand out of range (0x000000000000fe50 is not between 0xffffffffffff8000 and 0x0000000000007fff) Although the asm could be reworked, in practice a 32KB stack seems sufficient even for KASAN builds - the additional usage seems to be in the 2-3KB range for a 64-bit KASAN build. So only increase the stack for KASAN if the stack size is < 32KB.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.1.76, 6.6.18, 6.7.6
CVEs: CVE-2024-26710
Confirmed fixed CVEs: Not specified
Updated in this feed: 4 Nov 2026, 20:55 UTC · Revision 1

Source evidence

powerpc/kasan: Limit KASAN thread size increase to 32KB

core-osv · Original source

Published 3 Apr 2024, 14:55 UTC

osv:CVE-2024-26710

Kernel

Fixed versions: 6.1.76, 6.6.18, 6.7.6

Complete source record

{
  "id": "d94ac90cfbfea783e6999562a2450f252565563da0ef2dd122be9fc6a4439861",
  "url": "https://osv.dev/vulnerability/CVE-2024-26710",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "powerpc/kasan: Limit KASAN thread size increase to 32KB",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: powerpc/kasan: Limit KASAN thread size increase to 32KB KASAN is seen to increase stack usage, to the point that it was reported to lead to stack overflow on some 32-bit machines (see link). To avoid overflows the stack size was doubled for KASAN builds in commit 3e8635fb2e07 (\"powerpc/kasan: Force thread size increase with KASAN\"). However with a 32KB stack size to begin with, the doubling leads to a 64KB stack, which causes build errors: arch/powerpc/kernel/switch.S:249: Error: operand out of range (0x000000000000fe50 is not between 0xffffffffffff8000 and 0x0000000000007fff) Although the asm could be reworked, in practice a 32KB stack seems sufficient even for KASAN builds - the additional usage seems to be in the 2-3KB range for a 64-bit KASAN build. So only increase the stack for KASAN if the stack size is < 32KB.",
    "evidence": "osv:CVE-2024-26710",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.76",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.6.18",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "unknown",
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      "aliases": [
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      ],
      "modified": "2026-10-28T02:30:39.627712136Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4297217bcf1f0948a19c2bacc6b68d92e7778ad9",
        "https://git.kernel.org/stable/c/4cc31fa07445879a13750cb061bb8c2654975fcb",
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        "https://nvd.nist.gov/vuln/detail/CVE-2024-26710",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26710.json"
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    "related_cves": [
      {
        "value": "CVE-2024-26710",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 506930,
  "published_at": "2024-04-03T14:55:12.583+00:00"
}