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btrfs: fix reloc root cleanup in merge_reloc_roots()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix reloc root cleanup in merge_reloc_roots() If the root we got has zero root refs in its root item, we are resetting the root's ->reloc_root without using barriers like we do everywhere else. Sashiko complained about this while reviewing another patch, and it's correct (see the Link tag below). Also, we should not clear BTRFS_ROOT_DEAD_RELOC_TREE from the root unless the root points to the reloc root we have. Fix this by using clear_reloc_root(), which issues the memory barrier after setting the root's ->reloc_root to NULL and before clearing the bit BTRFS_ROOT_DEAD_RELOC_TREE from the root.

Announced Group revision 1
Original source ↗

CVE-2026-93798

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-2026-93798

Linux

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

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

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": [
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        "status": "affected",
        "version": "1dae7e0e58b484eaa43d530f211098fdeeb0f404",
        "lessThan": "29531470b1bf1e8bd2df4941fe913106edbca615",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1dae7e0e58b484eaa43d530f211098fdeeb0f404",
        "lessThan": "415f8665a969d3c906e4fd7c90fcbb4b357886f6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1dae7e0e58b484eaa43d530f211098fdeeb0f404",
        "lessThan": "ee695a968aa73b1e67ccbf2133dc0e54381d32b2",
        "versionType": "git"
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      {
        "status": "affected",
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        "lessThan": "0bc25f0a2d1b3e0a691431c4d7aef36afcd527c5",
        "versionType": "git"
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      {
        "status": "affected",
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        "lessThan": "ab48583aa9948205ff9a6470e23dbff74c565e24",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1dae7e0e58b484eaa43d530f211098fdeeb0f404",
        "lessThan": "63d6b1f04cd91c825329712aa526215ffa5d11ca",
        "versionType": "git"
      },
      {
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        "versionType": "git"
      },
      {
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        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "33823378ff2b510fd7b566f25bb18438aeb9b23b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.4.54",
        "lessThan": "5.5",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.7.11",
        "lessThan": "5.8",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/btrfs/relocation.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/btrfs/relocation.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93798

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#8275 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-93798 · Revision 1Source updated