{ "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", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.175" }, { "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" } } } }