CVE-2026-45999 (GCVE-0-2026-45999)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:55 – Updated: 2026-08-05 12:29
VLAI
Title
erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() Some crafted images can have illegal (!partial_decoding && m_llen < m_plen) extents, and the LZ4 inplace decompression path can be wrongly hit, but it cannot handle (outpages < inpages) properly: "outpages - inpages" wraps to a large value and the subsequent rq->out[] access reads past the decompressed_pages array. However, such crafted cases can correctly result in a corruption report in the normal LZ4 non-inplace path. Let's add an additional check to fix this for backporting. Reproducible image (base64-encoded gzipped blob): H4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g dilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i PNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz 2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w ywAAAAAAAADwu14ATsEYtgBQAAA= $ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt $ dd if=/mnt/data of=/dev/null bs=4096 count=1
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 598162d050801e556750defff4ddab499e5d76ed , < 778acd52e9497806fbd2cea7f770c41d6850fc48 (git)
Affected: 598162d050801e556750defff4ddab499e5d76ed , < 118ff71ff09ebaf323a09af9e911517321a299f4 (git)
Affected: 598162d050801e556750defff4ddab499e5d76ed , < 43a878639b90e9721ffa5eb616a7e6d8454adef3 (git)
Affected: 598162d050801e556750defff4ddab499e5d76ed , < f1374fa6e57fd836623668d782ded9244cfd2938 (git)
Affected: 598162d050801e556750defff4ddab499e5d76ed , < c9ce18e6bb2c467ec85756dc7989b547b7584fee (git)
Affected: 598162d050801e556750defff4ddab499e5d76ed , < bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e (git)
Affected: 598162d050801e556750defff4ddab499e5d76ed , < 21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab (git)
Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()\n\nSome crafted images can have illegal (!partial_decoding \u0026\u0026\nm_llen \u003c m_plen) extents, and the LZ4 inplace decompression path\ncan be wrongly hit, but it cannot handle (outpages \u003c inpages)\nproperly: \"outpages - inpages\" wraps to a large value and\nthe subsequent rq-\u003eout[] access reads past the decompressed_pages\narray.\n\nHowever, such crafted cases can correctly result in a corruption\nreport in the normal LZ4 non-inplace path.\n\nLet\u0027s add an additional check to fix this for backporting.\n\nReproducible image (base64-encoded gzipped blob):\n\nH4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g\ndilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i\nPNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz\n2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w\nywAAAAAAAADwu14ATsEYtgBQAAA=\n\n$ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt\n$ dd if=/mnt/data of=/dev/null bs=4096 count=1"
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              "value": "AV:L - EROFS is mounted from a local block device/image file (FS_REQUIRES_DEV, not userns-mountable); triggering requires locally providing a crafted image and reading from it, with no network path.\nAC:L - The attacker fully controls the crafted image (a working base64 reproducer is in the commit); the illegal extent reliably forces outpages\u003cinpages and the underflow on the first read with no race or uncontrolled condition.\nPR:N - Crafting the malicious image requires no privileges or account on the target system; the attacker merely supplies the image, consistent with the analogous crafted-image CVE-2026-43166 (PR:N).\nUI:R - A victim or automount service must mount the attacker-supplied EROFS image and access the file for the decompression path to be reached.\nS:U - The OOB access and resulting crash stay within the kernel\u0027s own security authority; no VM/IOMMU/sandbox boundary is crossed.\nC:H - The unsigned underflow produces an unbounded out-of-bounds read of the page-pointer array far past its end, and in the matching path wild kernel memory can be fed into the decompressed output read by userspace \u2014 per kernel guidance an unbounded OOB read is High.\nI:N - The flaw is strictly a read underflow (\"reads past the decompressed_pages array\"); it yields no out-of-bounds write or control-flow primitive, matching the analogous OOB-read CVE-2026-43166 (I:N).\nA:H - Indexing the array ~32 GB beyond its base dereferences unmapped kernel memory, reliably causing a kernel oops/panic and denial of service."
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        "dateUpdated": "2026-08-05T12:29:04.993Z",
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    "dateReserved": "2026-05-13T15:03:33.091Z",
    "dateUpdated": "2026-08-05T12:29:04.993Z",
    "state": "PUBLISHED"
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      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-45999.json",
      "version": "3"
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(base64-encoded gzipped blob):\\n\\nH4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g\\ndilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i\\nPNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz\\n2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w\\nywAAAAAAAADwu14ATsEYtgBQAAA=\\n\\n$ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt\\n$ dd if=/mnt/data of=/dev/null bs=4096 count=1\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/erofs/decompressor.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"598162d050801e556750defff4ddab499e5d76ed\",\"lessThan\":\"778acd52e9497806fbd2cea7f770c41d6850fc48\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"598162d050801e556750defff4ddab499e5d76ed\",\"lessThan\":\"118ff71ff09ebaf323a09af9e911517321a299f4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"598162d050801e556750defff4ddab499e5d76ed\",\"lessThan\":\"43a878639b90e9721ffa5eb616a7e6d8454adef3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"598162d050801e556750defff4ddab499e5d76ed\",\"lessThan\":\"f1374fa6e57fd836623668d782ded9244cfd2938\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"598162d050801e556750defff4ddab499e5d76ed\",\"lessThan\":\"c9ce18e6bb2c467ec85756dc7989b547b7584fee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"598162d050801e556750defff4ddab499e5d76ed\",\"lessThan\":\"bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"598162d050801e556750defff4ddab499e5d76ed\",\"lessThan\":\"21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/erofs/decompressor.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.88\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.30\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.4\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-191\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.13\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"3E67E12B-C9B9-4C36-87B6-F887F426E683\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.88\",\"matchCriteriaId\":\"5AFBE0EC-CCDF-4207-AE92-ABF958125CA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.30\",\"matchCriteriaId\":\"BF39AE08-AE6D-4410-8FBE-76F6BF5BF55B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.4\",\"matchCriteriaId\":\"CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/118ff71ff09ebaf323a09af9e911517321a299f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/43a878639b90e9721ffa5eb616a7e6d8454adef3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/778acd52e9497806fbd2cea7f770c41d6850fc48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:50:33+00:00",
      "cve": "CVE-2026-45999",
      "id": "CVE-2026-45999",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45999.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:08:44Z",
      "cve": "CVE-2026-45999",
      "id": "CVE-2026-45999",
      "initial_release_date": "2026-05-28T03:54:38Z",
      "product_status:known_affected": "202",
      "product_status:known_not_affected": "91",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45999",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45999.json",
      "version": "5"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • 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.