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CVE-2026-89490 (GCVE-0-2026-89490)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
ocfs2: fix readdir position truncation on 32-bit kernels
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix readdir position truncation on 32-bit kernels In ocfs2_dir_foreach_blk_el(), the directory cookie position is rebuilt with ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1)) | offset; `ctx->pos` is loff_t (signed 64-bit), while `sb->s_blocksize` is unsigned long. On 32-bit kernels unsigned long is 32-bit, so the mask ~(sb->s_blocksize - 1) is computed as a 32-bit unsigned value (e.g. 0xfffff000 for a 4 KiB block size). In the AND expression with the 64-bit `ctx->pos`, that unsigned operand is zero-extended to 64 bits per the usual arithmetic conversions, yielding 0x00000000fffff000. The high 32 bits of `ctx->pos` are silently cleared, even though directory size is allowed to exceed 4 GiB. When readdir() crosses the 4 GiB boundary on a 32-bit kernel the position is reset back into the first 4 GiB block, making the re-validation path re-enumerate already-returned dirents indefinitely. This is ocfs2_dir_foreach_blk_el(), the extent-list readdir path taken for all non-inline directories, so a directory large enough to cross 4 GiB reaches it. This is the same class of bug that commit 3dce5bb82c97 ("exfat: Fix bitwise operation having different size") fixed in exfat, and the fix mirrors the equivalent ext4 fix in this series. Cast the operand to loff_t so the mask is 64-bit before the AND: ctx->pos = (ctx->pos & ~((loff_t)sb->s_blocksize - 1)) | offset; 64-bit kernels are unaffected.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < c28dc3407937aa8f225942538cd585c9b28ea65a (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 94569154ba49f5f85645d2019c8e206213d8404e (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 1ae7029823ae4c91664cb32eec7fb8dd5e1a337a (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < f9dd5cad8d09110ddff2db1fe756aae93c7552ff (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 1001fb3b69a11eaa0dc7c7428f6edfa48b88997a (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < c0c165487a2ea5a37ddcdab4259157b7a527129c (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < b53e2b271eeb6040c2a4a78230c570dc41cdcfa4 (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < a63308ab426f3a3c7e33b02c150ea59054620261 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.16
Unaffected: 0 , < 2.6.16 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix readdir position truncation on 32-bit kernels\n\nIn ocfs2_dir_foreach_blk_el(), the directory cookie position is\nrebuilt with\n\n\tctx-\u003epos = (ctx-\u003epos \u0026 ~(sb-\u003es_blocksize - 1)) | offset;\n\n`ctx-\u003epos` is loff_t (signed 64-bit), while `sb-\u003es_blocksize` is\nunsigned long.  On 32-bit kernels unsigned long is 32-bit, so the mask\n\n\t~(sb-\u003es_blocksize - 1)\n\nis computed as a 32-bit unsigned value (e.g. 0xfffff000 for a 4 KiB\nblock size).  In the AND expression with the 64-bit `ctx-\u003epos`, that\nunsigned operand is zero-extended to 64 bits per the usual arithmetic\nconversions, yielding 0x00000000fffff000.  The high 32 bits of\n`ctx-\u003epos` are silently cleared, even though directory size is\nallowed to exceed 4 GiB.\n\nWhen readdir() crosses the 4 GiB boundary on a 32-bit kernel the\nposition is reset back into the first 4 GiB block, making the\nre-validation path re-enumerate already-returned dirents indefinitely.\n\nThis is ocfs2_dir_foreach_blk_el(), the extent-list readdir path taken\nfor all non-inline directories, so a directory large enough to cross\n4 GiB reaches it.\n\nThis is the same class of bug that commit 3dce5bb82c97 (\"exfat: Fix\nbitwise operation having different size\") fixed in exfat, and the\nfix mirrors the equivalent ext4 fix in this series.  Cast the operand\nto loff_t so the mask is 64-bit before the AND:\n\n\tctx-\u003epos = (ctx-\u003epos \u0026 ~((loff_t)sb-\u003es_blocksize - 1)) | offset;\n\n64-bit kernels are unaffected."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/1001fb3b69a11eaa0dc7c7428f6edfa48b88997a"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/a63308ab426f3a3c7e33b02c150ea59054620261"
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      "title": "ocfs2: fix readdir position truncation on 32-bit kernels",
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    "datePublished": "2026-09-11T19:43:42.808Z",
    "dateReserved": "2026-09-11T19:38:34.713Z",
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      "cve": "CVE-2026-89490",
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      "source": "Microsoft CSAF VEX",
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      "title": "ocfs2: fix readdir position truncation on 32-bit kernels",
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In the AND expression with the 64-bit `ctx-\u003epos`, that\\nunsigned operand is zero-extended to 64 bits per the usual arithmetic\\nconversions, yielding 0x00000000fffff000.  The high 32 bits of\\n`ctx-\u003epos` are silently cleared, even though directory size is\\nallowed to exceed 4 GiB.\\n\\nWhen readdir() crosses the 4 GiB boundary on a 32-bit kernel the\\nposition is reset back into the first 4 GiB block, making the\\nre-validation path re-enumerate already-returned dirents indefinitely.\\n\\nThis is ocfs2_dir_foreach_blk_el(), the extent-list readdir path taken\\nfor all non-inline directories, so a directory large enough to cross\\n4 GiB reaches it.\\n\\nThis is the same class of bug that commit 3dce5bb82c97 (\\\"exfat: Fix\\nbitwise operation having different size\\\") fixed in exfat, and the\\nfix mirrors the equivalent ext4 fix in this series.  Cast the operand\\nto loff_t so the mask is 64-bit before the AND:\\n\\n\\tctx-\u003epos = (ctx-\u003epos \u0026 ~((loff_t)sb-\u003es_blocksize - 1)) | offset;\\n\\n64-bit kernels are unaffected.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/dir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"c28dc3407937aa8f225942538cd585c9b28ea65a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"94569154ba49f5f85645d2019c8e206213d8404e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"1ae7029823ae4c91664cb32eec7fb8dd5e1a337a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"f9dd5cad8d09110ddff2db1fe756aae93c7552ff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"1001fb3b69a11eaa0dc7c7428f6edfa48b88997a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"c0c165487a2ea5a37ddcdab4259157b7a527129c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"b53e2b271eeb6040c2a4a78230c570dc41cdcfa4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"a63308ab426f3a3c7e33b02c150ea59054620261\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/dir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1001fb3b69a11eaa0dc7c7428f6edfa48b88997a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1ae7029823ae4c91664cb32eec7fb8dd5e1a337a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/94569154ba49f5f85645d2019c8e206213d8404e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a63308ab426f3a3c7e33b02c150ea59054620261\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b53e2b271eeb6040c2a4a78230c570dc41cdcfa4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c0c165487a2ea5a37ddcdab4259157b7a527129c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c28dc3407937aa8f225942538cd585c9b28ea65a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f9dd5cad8d09110ddff2db1fe756aae93c7552ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T00:12:46+00:00",
      "cve": "CVE-2026-89490",
      "id": "CVE-2026-89490",
      "initial_release_date": "2026-09-11T19:43:42.808000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ocfs2: ocfs2: Denial of Service via readdir position truncation on 32-bit kernels",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89490.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:02:58Z",
      "cve": "CVE-2026-89490",
      "id": "CVE-2026-89490",
      "initial_release_date": "2026-09-12T16:27:34Z",
      "product_status:known_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89490",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89490.json",
      "version": "3"
    }
  }
}



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  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.