{
  "cveId": "CVE-2026-23238",
  "url": "https://patchblox.com/security/cve/CVE-2026-23238",
  "summary": "CVE-2026-23238 is fixed in 23 products on 1 platform, first by DEBIAN-CVE-2026-23238, released March 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "romfs: check sb_set_blocksize() return value",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  romfs: check sb_set_blocksize() return value  romfs_fill_super() ignores the return value of sb_set_blocksize(), which can fail if the requested block size is incompatible with the block device\u0027s configuration.  This can be triggered by setting a loop device\u0027s block size larger than PAGE_SIZE using ioctl(LOOP_SET_BLOCK_SIZE, 32768), then mounting a romfs filesystem on that device.  When sb_set_blocksize(sb, ROMBSIZE) is called with ROMBSIZE=4096 but the device has logical_block_size=32768, bdev_validate_blocksize() fails because the requested size is smaller than the device\u0027s logical block size. sb_set_blocksize() returns 0 (failure), but romfs ignores this and continues mounting.  The superblock\u0027s block size remains at the device\u0027s logical block size (32768). Later, when sb_bread() attempts I/O with this oversized block size, it triggers a kernel BUG in folio_set_bh():      kernel BUG at fs/buffer.c:1582!     BUG_ON(size \u003E PAGE_SIZE);  Fix by checking the return value of sb_set_blocksize() and failing the mount with -EINVAL if it returns 0.",
  "published": "2026-03-04T15:16:14Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00215,
  "epssPercentile": 0.11993,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23238",
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
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      "product": "kernel-libbpf-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
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      "product": "kernel-libbpf-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
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      "product": "kernel-libbpf-static",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
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      "product": "kernel-modules-extra-common",
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      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
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      "released": "2026-03-16T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
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      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.164-1",
      "fix": "DEBIAN-CVE-2026-23238",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-23238",
      "released": "2026-03-04T15:16:14Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.74-2",
      "fix": "DEBIAN-CVE-2026-23238",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-23238",
      "released": "2026-03-04T15:16:14Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.18.13-1",
      "fix": "DEBIAN-CVE-2026-23238",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-23238",
      "released": "2026-03-04T15:16:14Z"
    },
    {
      "platform": "linux",
      "product": "perf",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
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      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    },
    {
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      "release": "amzn 2023",
      "fixedVersion": "1:6.1.164-196.303.amzn2023",
      "fix": "ALAS2023-2026-1491",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1491",
      "released": "2026-03-16T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}