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bcache: fix variable length array abuse in btree_iter

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bcache: fix variable length array abuse in btree_iter btree_iter is used in two ways: either allocated on the stack with a fixed size MAX_BSETS, or from a mempool with a dynamic size based on the specific cache set. Previously, the struct had a fixed-length array of size MAX_BSETS which was indexed out-of-bounds for the dynamically-sized iterators, which causes UBSAN to complain. This patch uses the same approach as in bcachefs's sort_iter and splits the iterator into a btree_iter with a flexible array member and a btree_iter_stack which embeds a btree_iter as well as a fixed-length data array.

Announced Source revision 1
Original source ↗

CVE-2024-39482

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-2024-39482

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": [
      {
        "status": "affected",
        "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
        "lessThan": "2c3d7b03b658dc8bfa6112b194b67b92a87e081b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
        "lessThan": "5a1922adc5798b7ec894cd3f197afb6f9591b023",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
        "lessThan": "934e1e4331859183a861f396d7dfaf33cb5afb02",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
        "lessThan": "6479b9f41583b013041943c4602e1ad61cec8148",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
        "lessThan": "0c31344e22dd8d6b1394c6e4c41d639015bdc671",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
        "lessThan": "3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/md/bcache/bset.c",
      "drivers/md/bcache/bset.h",
      "drivers/md/bcache/btree.c",
      "drivers/md/bcache/super.c",
      "drivers/md/bcache/sysfs.c",
      "drivers/md/bcache/writeback.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.162",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.34",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.9.5",
        "versionType": "semver",
        "lessThanOrEqual": "6.9.*"
      },
      {
        "status": "unaffected",
        "version": "6.10",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/md/bcache/bset.c",
      "drivers/md/bcache/bset.h",
      "drivers/md/bcache/btree.c",
      "drivers/md/bcache/super.c",
      "drivers/md/bcache/sysfs.c",
      "drivers/md/bcache/writeback.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-39482

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#26629 · Revision 1
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Publisher date
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