{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74349", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.886Z", "datePublished": "2026-08-15T05:58:36.630Z", "dateUpdated": "2026-08-17T05:46:12.774Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:46:12.774Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reject FITRIM ranges shorter than a cluster\n\nocfs2_trim_mainbm() trims the global bitmap in cluster units, but its\ntoo-short range validation only checks sb->s_blocksize.\n\nOn filesystems with a cluster size larger than the block size, a FITRIM\nrange that is at least one block but shorter than one cluster is accepted\nand shifted down to len == 0. The later start + len - 1 and len -= ... \narithmetic then underflows and can drive trimming past the requested\nrange.\n\nReject ranges shorter than s_clustersize instead. That preserves the\nexisting -EINVAL behavior for requests that cannot discard even one\nallocation unit and keeps zero-cluster trims out of the group walk." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires a local FITRIM ioctl on an open OCFS2 mount (typically via fstrim or ioctl on the mountpoint); there is no network-facing OCFS2 handler or remote protocol path to this code.\nAC:L - An attacker with the required privileges can reliably trigger the bug by supplying a FITRIM range at least one block long but shorter than one cluster, which is common when OCFS2 cluster size exceeds the 4K block size.\nPR:L - The FITRIM handler explicitly requires capable(CAP_SYS_ADMIN) before calling ocfs2_trim_fs(); per kernel CNA guidance this maps to Low because CAP_SYS_ADMIN can be held by root inside a user namespace.\nUI:N - No victim interaction is required; the privileged attacker directly issues the FITRIM ioctl with crafted range parameters to trigger the faulty trim logic.\nS:U - Impact is confined to erroneous discard/trim operations within the same privileged filesystem context on the affected host and shared storage; it does not cross VM, container, or IOMMU security boundaries.\nC:N - The flaw causes incorrect discard of free clusters via sb_issue_discard and integer underflow in range arithmetic; it does not read kernel memory, leak pointers, or expose sensitive data to the attacker.\nI:H - Unsigned underflow can drive trimming far beyond the requested FITRIM range, issuing discard on extensive free-space regions on shared cluster storage and risking unintended loss or corruption of filesystem data integrity.\nA:H - Corrupted len/last_group values can cause prolonged iteration through cluster groups while holding the exclusive OCFS2 cluster-wide trim DLM lock, enabling severe denial of service or hang for the node and other cluster members." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ocfs2/alloc.c" ], "versions": [ { "version": "aa89762c54800208d5afdcd8e6bf124818f17fe0", "lessThan": "d903d59c0315f59bdf0214b4f13d71c9feb2c45c", "status": "affected", "versionType": "git" }, { "version": "aa89762c54800208d5afdcd8e6bf124818f17fe0", "lessThan": "441abb77222f155e8d931dbabb465466db01cfd7", "status": "affected", "versionType": "git" }, { "version": "aa89762c54800208d5afdcd8e6bf124818f17fe0", "lessThan": "e652d0f5108e447b22da4249bcd23dd1b63c73dd", "status": "affected", "versionType": "git" }, { "version": "aa89762c54800208d5afdcd8e6bf124818f17fe0", "lessThan": "346314bb0cc2fc52b50b73d6ecc62e0217455c2e", "status": "affected", "versionType": "git" }, { "version": "aa89762c54800208d5afdcd8e6bf124818f17fe0", "lessThan": "06c0a0431b9856506fcd9b2c1b0c6136567d756d", "status": "affected", "versionType": "git" }, { "version": "aa89762c54800208d5afdcd8e6bf124818f17fe0", "lessThan": "3fa7139b5f42731a61f78c42433adae13f9adc21", "status": "affected", "versionType": "git" }, { "version": "aa89762c54800208d5afdcd8e6bf124818f17fe0", "lessThan": "2c13e02592b918be7725ab5965e01ef4e46c4b57", "status": "affected", "versionType": "git" }, { "version": "aa89762c54800208d5afdcd8e6bf124818f17fe0", "lessThan": "ca1afd88f5eaaff9168e1466e5401385edf59543", "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/ocfs2/alloc.c" ], "versions": [ { "version": "3.14", "status": "affected" }, { "version": "0", "lessThan": "3.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "3.14", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d903d59c0315f59bdf0214b4f13d71c9feb2c45c" }, { "url": "https://git.kernel.org/stable/c/441abb77222f155e8d931dbabb465466db01cfd7" }, { "url": "https://git.kernel.org/stable/c/e652d0f5108e447b22da4249bcd23dd1b63c73dd" }, { "url": "https://git.kernel.org/stable/c/346314bb0cc2fc52b50b73d6ecc62e0217455c2e" }, { "url": "https://git.kernel.org/stable/c/06c0a0431b9856506fcd9b2c1b0c6136567d756d" }, { "url": "https://git.kernel.org/stable/c/3fa7139b5f42731a61f78c42433adae13f9adc21" }, { "url": "https://git.kernel.org/stable/c/2c13e02592b918be7725ab5965e01ef4e46c4b57" }, { "url": "https://git.kernel.org/stable/c/ca1afd88f5eaaff9168e1466e5401385edf59543" } ], "title": "ocfs2: reject FITRIM ranges shorter than a cluster", "x_generator": { "engine": "bippy-1.2.0" } } } }