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vuln-cve/data/2026/53xxx/CVE-2026-53130.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-53130",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-06-09T07:44:35.386Z",
"datePublished": "2026-06-24T16:30:57.227Z",
"dateUpdated": "2026-08-05T12:33:24.185Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:33:24.185Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START\n\nomfs_fill_super() rejects oversized s_sys_blocksize values (> PAGE_SIZE),\nbut it does not reject values smaller than OMFS_DIR_START (0x1b8 = 440).\n\nLater, omfs_make_empty() uses\n\n sbi->s_sys_blocksize - OMFS_DIR_START\n\nas the length argument to memset(). Since s_sys_blocksize is u32,\na crafted filesystem image with s_sys_blocksize < OMFS_DIR_START causes\nan unsigned underflow there, wrapping to a value near 2^32. That drives\na ~4 GiB memset() from bh->b_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."
}
],
"metrics": [
{
"cvssV3_1": {
"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"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires a crafted OMFS block filesystem image to be mounted and then operated on locally; there is no network packet or adjacent-radio path into this filesystem code.\nAC:L - A crafted image with s_sys_blocksize below OMFS_DIR_START can deterministically reach the underflow when a directory is created; there is no race or condition outside attacker control beyond having OMFS support present.\nPR:N - Although direct self-mounting OMFS requires CAP_SYS_ADMIN in the initial namespace and is not reachable through user namespaces, the highest reasonable crafted-image scenario requires no attacker account or privileges and relies on a victim/privileged mount workflow.\nUI:R - A user or privileged automount-like workflow must mount the crafted OMFS image and perform an operation such as directory creation on it before omfs_make_empty() is reached.\nS:U - The corruption occurs within the Linux kernel on the same host security authority and does not cross a VM, IOMMU, or other scope boundary.\nC:H - The bug is a massive kernel out-of-bounds write, and successful exploitation of kernel memory corruption can yield kernel code execution or privilege escalation with access to confidential data.\nI:H - The unsigned underflow drives a near-4 GiB memset past the buffer_head data, corrupting arbitrary kernel memory beyond the filesystem buffer.\nA:H - The oversized kernel memset can corrupt critical memory and reliably cause an oops, panic, hang, or other full system denial of service."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/omfs/inode.c"
],
"versions": [
{
"version": "a3ab7155ea21aadc8a4d5687e91b3d876973185e",
"lessThan": "fbc72f5c645155dc2ed3573243ed20f9913e3a54",
"status": "affected",
"versionType": "git"
},
{
"version": "a3ab7155ea21aadc8a4d5687e91b3d876973185e",
"lessThan": "5822a05a841a10794ad818620dd2af490b0705d3",
"status": "affected",
"versionType": "git"
},
{
"version": "a3ab7155ea21aadc8a4d5687e91b3d876973185e",
"lessThan": "754ff1bea3819a90c6f33cccfc1a299ef7609f07",
"status": "affected",
"versionType": "git"
},
{
"version": "a3ab7155ea21aadc8a4d5687e91b3d876973185e",
"lessThan": "131ea3e57fc22936ed0e2c8330f2e36106172f51",
"status": "affected",
"versionType": "git"
},
{
"version": "a3ab7155ea21aadc8a4d5687e91b3d876973185e",
"lessThan": "79f84af38c9fef9deb0e02c79eb969b5541c2644",
"status": "affected",
"versionType": "git"
},
{
"version": "a3ab7155ea21aadc8a4d5687e91b3d876973185e",
"lessThan": "6561afc38398e3518a29c5eebb975c30468f98a6",
"status": "affected",
"versionType": "git"
},
{
"version": "a3ab7155ea21aadc8a4d5687e91b3d876973185e",
"lessThan": "817f16ed62bc58a168417bfb5e859c2a370bab03",
"status": "affected",
"versionType": "git"
},
{
"version": "a3ab7155ea21aadc8a4d5687e91b3d876973185e",
"lessThan": "0621c385fda1376e967f37ccd534c26c3e511d14",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/omfs/inode.c"
],
"versions": [
{
"version": "2.6.27",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.27",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.258",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.209",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.175",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.141",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.91",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.33",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0.10",
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.27",
"versionEndExcluding": "5.10.258"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.27",
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},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.27",
"versionEndExcluding": "6.6.141"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.27",
"versionEndExcluding": "6.12.91"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.27",
"versionEndExcluding": "6.18.33"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.27",
"versionEndExcluding": "7.0.10"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.27",
"versionEndExcluding": "7.1"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/fbc72f5c645155dc2ed3573243ed20f9913e3a54"
},
{
"url": "https://git.kernel.org/stable/c/5822a05a841a10794ad818620dd2af490b0705d3"
},
{
"url": "https://git.kernel.org/stable/c/754ff1bea3819a90c6f33cccfc1a299ef7609f07"
},
{
"url": "https://git.kernel.org/stable/c/131ea3e57fc22936ed0e2c8330f2e36106172f51"
},
{
"url": "https://git.kernel.org/stable/c/79f84af38c9fef9deb0e02c79eb969b5541c2644"
},
{
"url": "https://git.kernel.org/stable/c/6561afc38398e3518a29c5eebb975c30468f98a6"
},
{
"url": "https://git.kernel.org/stable/c/817f16ed62bc58a168417bfb5e859c2a370bab03"
},
{
"url": "https://git.kernel.org/stable/c/0621c385fda1376e967f37ccd534c26c3e511d14"
}
],
"title": "fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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