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powerpc/kexec_file: Prevent kexec range truncation

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: powerpc/kexec_file: Prevent kexec range truncation Sashiko AI review pointed out the following issue. The __merge_memory_ranges() function incorrectly handles overlapping memory ranges when merging them. Although sort_memory_ranges() sorts all ranges by their start address in ascending order beforehand, the merge logic remains defective in two ways: 1. It compares the current range's start against the previous element (i-1) instead of the running target index (idx) 2. It unconditionally overwrites 'ranges[idx].end' with 'ranges[i].end'. This logic flaw leads to critical memory truncation when a larger memory range completely subsumes subsequent smaller ranges. For example, consider a sorted input array with three ranges: Range A (idx=0): [0x1000 - 0x9000] Range B (i=1): [0x2000 - 0x5000] (completely inside Range A) Range C (i=2): [0x6000 - 0x8000] (completely inside Range A) 1. When i=1 (Range B): ranges[1].start (0x2000) <= ranges[0].end + 1 (0x9001) is TRUE. The code executes: ranges[0].end = ranges[1].end, which erroneously shrinks Range A's end from 0x9000 down to 0x5000. 2. When i=2 (Range C): ranges[2].start (0x6000) <= ranges[1].end + 1 (0x5001) is FALSE. The code falls into the else block, creating a broken new range. As a result, valid memory fragments [0x5001 - 0x5fff] and [0x8001 - 0x9000] are completely lost from the kexec exclude lists, potentially allowing the crash kernel to overwrite active me

Announced Source revision 1
Original source ↗

CVE-2026-89962

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89962

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "180adfc532a83c1d74146449f7385f767d4b8059",
        "lessThan": "ffbdc2a3834a3e47bac7236a71bbc82b45c83832",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "180adfc532a83c1d74146449f7385f767d4b8059",
        "lessThan": "9ef63622e6cee588ea4b763a6afc87065254b36a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "180adfc532a83c1d74146449f7385f767d4b8059",
        "lessThan": "da88a2a2119e4fd0e8919a7a2448682f574e1545",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "180adfc532a83c1d74146449f7385f767d4b8059",
        "lessThan": "c4cb547f26d9b73b489c5278d0c8db837c5a174f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "180adfc532a83c1d74146449f7385f767d4b8059",
        "lessThan": "fa40f9dbdd4af53e7445d9135b5b207eb8adf372",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/powerpc/kexec/ranges.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/powerpc/kexec/ranges.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89962

Source reference: /cveMetadata/cveId

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Event
#48572 · Revision 1
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