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CVE-2026-53130 (GCVE-0-2026-53130)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-08-05 12:33
VLAI
Title
fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START omfs_fill_super() rejects oversized s_sys_blocksize values (> PAGE_SIZE), but it does not reject values smaller than OMFS_DIR_START (0x1b8 = 440). Later, omfs_make_empty() uses sbi->s_sys_blocksize - OMFS_DIR_START as the length argument to memset(). Since s_sys_blocksize is u32, a crafted filesystem image with s_sys_blocksize < OMFS_DIR_START causes an unsigned underflow there, wrapping to a value near 2^32. That drives a ~4 GiB memset() from bh->b_data + OMFS_DIR_START and overwrites kernel memory far beyond the backing block buffer. Add the corresponding lower-bound check alongside the existing upper-bound check in omfs_fill_super(), so that malformed images are rejected during superblock validation before any filesystem data is processed.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < fbc72f5c645155dc2ed3573243ed20f9913e3a54 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 5822a05a841a10794ad818620dd2af490b0705d3 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 754ff1bea3819a90c6f33cccfc1a299ef7609f07 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 131ea3e57fc22936ed0e2c8330f2e36106172f51 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 79f84af38c9fef9deb0e02c79eb969b5541c2644 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 6561afc38398e3518a29c5eebb975c30468f98a6 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 817f16ed62bc58a168417bfb5e859c2a370bab03 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 0621c385fda1376e967f37ccd534c26c3e511d14 (git)
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Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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That drives\\na ~4 GiB memset() from bh-\u003eb_data + OMFS_DIR_START and overwrites kernel\\nmemory far beyond the backing block buffer.\\n\\nAdd the corresponding lower-bound check alongside the existing upper-bound\\ncheck in omfs_fill_super(), so that malformed images are rejected during\\nsuperblock validation before any filesystem data is processed.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/omfs/inode.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a3ab7155ea21aadc8a4d5687e91b3d876973185e\",\"lessThan\":\"fbc72f5c645155dc2ed3573243ed20f9913e3a54\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a3ab7155ea21aadc8a4d5687e91b3d876973185e\",\"lessThan\":\"5822a05a841a10794ad818620dd2af490b0705d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a3ab7155ea21aadc8a4d5687e91b3d876973185e\",\"lessThan\":\"754ff1bea3819a90c6f33cccfc1a299ef7609f07\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a3ab7155ea21aadc8a4d5687e91b3d876973185e\",\"lessThan\":\"131ea3e57fc22936ed0e2c8330f2e36106172f51\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a3ab7155ea21aadc8a4d5687e91b3d876973185e\",\"lessThan\":\"79f84af38c9fef9deb0e02c79eb969b5541c2644\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a3ab7155ea21aadc8a4d5687e91b3d876973185e\",\"lessThan\":\"6561afc38398e3518a29c5eebb975c30468f98a6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a3ab7155ea21aadc8a4d5687e91b3d876973185e\",\"lessThan\":\"817f16ed62bc58a168417bfb5e859c2a370bab03\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a3ab7155ea21aadc8a4d5687e91b3d876973185e\",\"lessThan\":\"0621c385fda1376e967f37ccd534c26c3e511d14\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/omfs/inode.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.27\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.27\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"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:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"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\":\"2.6.27\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"4BFE5F87-8EF8-405C-970E-8A403D490D87\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.141\",\"matchCriteriaId\":\"97A9FFFA-22BB-4D5C-9790-5A2286E392F7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.91\",\"matchCriteriaId\":\"C918746B-DE6F-448F-A93E-A04C5481688D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.33\",\"matchCriteriaId\":\"96D99E49-380D-43AB-BDBA-25C3AD018A9C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-20T12:30:21+00:00",
      "cve": "CVE-2026-53130",
      "id": "CVE-2026-53130",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel OMFS: Arbitrary code execution via crafted filesystem image",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53130.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T02:40:05Z",
      "cve": "CVE-2026-53130",
      "id": "CVE-2026-53130",
      "initial_release_date": "2026-07-01T03:18:38Z",
      "product_status:known_affected": "387",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53130",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53130.json",
      "version": "4"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.