{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46303", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.111Z", "datePublished": "2026-06-08T15:46:30.642Z", "dateUpdated": "2026-08-05T12:31:06.574Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:06.574Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nisofs: validate Rock Ridge CE continuation extent against volume size\n\nrock_continue() reads rs->cont_extent verbatim from the Rock Ridge CE\nrecord and passes it to sb_bread() without checking that the block\nnumber is within the mounted ISO 9660 volume. commit e595447e177b\n(\"[PATCH] rock.c: handle corrupted directories\") added cont_offset\nand cont_size rejection for the CE continuation but did not validate\nthe extent block number itself. commit f54e18f1b831 (\"isofs: Fix\ninfinite looping over CE entries\") later capped the CE chain length\nat RR_MAX_CE_ENTRIES = 32 but again left the block number unchecked.\n\nWith a crafted ISO mounted via udisks2 (desktop optical auto-mount)\nor via CAP_SYS_ADMIN mount, rs->cont_extent can therefore point at\nan out-of-range block or at blocks belonging to an adjacent\nfilesystem on the same block device. sb_bread() on an out-of-range\nblock returns NULL cleanly via the block layer EIO path, so there\nis no memory-safety violation. For in-range reads of adjacent-\nfilesystem data, the CE buffer is parsed as Rock Ridge records and\nonly the text of SL sub-records reaches userspace through\nreadlink(), which makes the info-leak channel narrow and difficult\nto exploit; still, rejecting the malformed CE outright matches the\nrejection shape already present in the same function for\ncont_offset and cont_size.\n\nAdd an ISOFS_SB(sb)->s_nzones bounds check to rock_continue() next\nto the existing offset/size rejection, printing the same\ncorrupted-directory-entry notice." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "baseScore": 8.2, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - isofs supports NFS export (export.c), and nfsd_readlink()/LOOKUP on an exported mount reach rock_continue() through vfs_get_link() and isofs_iget() without any local syscall on the attacking host.\nAC:L - The attacker fully controls CE extent, offset, and size in a crafted ISO image, so triggering the bad sb_bread() path is reliable once the image is mounted and accessed.\nPR:N - A remote NFS client needs only network access to an exported isofs mount to invoke symlink readlink and directory inode parsing; no CAP_SYS_ADMIN or host root on the attacker's machine is required.\nUI:N - An attacker with a local shell can loop-mount a malicious ISO inside a user namespace (CAP_SYS_ADMIN there) and trigger exploitation without any separate victim action.\nS:U - Impact is unauthorized kernel-mediated reads and limited inode metadata skew on the same host; there is no VM escape, sandbox breakout, or cross-security-authority boundary change.\nC:H - In-range CE extents can cause sb_bread() to fetch blocks from an adjacent filesystem on the same device, and mis-parsed Rock Ridge SL text is returned to userspace through readlink(), constituting unauthorized data disclosure.\nI:L - Adjacent-block data parsed as Rock Ridge PX/PN/CL records during inode setup can overwrite inode mode, ownership, device numbers, or relocation fields, but there is no arbitrary kernel write or memory corruption.\nA:N - Out-of-range blocks fail cleanly through sb_bread()'s NULL/EIO path with no oops, panic, or hang; errors propagate as -EIO to the calling syscall or NFS operation." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/isofs/rock.c" ], "versions": [ { "version": "f54e18f1b831c92f6512d2eedb224cd63d607d3d", "lessThan": "8356fb821016797f5677cbeee5ddc0d32a95b4be", "status": "affected", "versionType": "git" }, { "version": "f54e18f1b831c92f6512d2eedb224cd63d607d3d", "lessThan": "d582e12378bc1637f337622feef762f53c43fd57", "status": "affected", "versionType": "git" }, { "version": "f54e18f1b831c92f6512d2eedb224cd63d607d3d", "lessThan": "bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9", "status": "affected", "versionType": "git" }, { "version": "f54e18f1b831c92f6512d2eedb224cd63d607d3d", "lessThan": "c9b37c8b73f6368e4750e5ccb0632c380b43c6e5", "status": "affected", "versionType": "git" }, { "version": "f54e18f1b831c92f6512d2eedb224cd63d607d3d", "lessThan": "22b36fa081f38ab397c7697f9d539211b51a0cfc", "status": "affected", "versionType": "git" }, { "version": "f54e18f1b831c92f6512d2eedb224cd63d607d3d", "lessThan": "e69da8eeab74b4f4505024c38a17bce060fe7df8", "status": "affected", "versionType": "git" }, { "version": "f54e18f1b831c92f6512d2eedb224cd63d607d3d", "lessThan": "ef048470c90bc8c1b8318bb2ce329da9ef64b9fe", "status": "affected", "versionType": "git" }, { "version": "f54e18f1b831c92f6512d2eedb224cd63d607d3d", "lessThan": "a36d990f591320e9dd379ab30063ebfe91d47e1f", "status": "affected", "versionType": "git" }, { "version": "08313e26e06d4aa9ce1cbba1a8e359e9cab9ad56", "status": "affected", "versionType": "git" }, { "version": "212c4d33ca83e2144064fe9c2911607fbed5386f", "status": "affected", "versionType": "git" }, { "version": "96e44adce250199ec9b2b928be66365779ff1b59", "status": "affected", "versionType": "git" }, { "version": "1fe5620fcd6c2f0a4a927ee10c8e53196da392f3", "status": "affected", "versionType": "git" }, { "version": "fbce0d7dc8965c9fb8d411862040239d4a768c71", "status": "affected", "versionType": "git" }, { "version": "8190393a88f2b0321263a54f2a9eb5a2aa43be7e", "status": "affected", "versionType": "git" }, { "version": "486aa789eadcf44ed87f972b209299c516454693", "status": "affected", "versionType": "git" }, { "version": "b6d20edb6e7cedb4eedb9e0193d20dd488ebae84", "status": "affected", "versionType": "git" }, { "version": "2.6.32.66", "lessThan": "2.6.33", "status": "affected", "versionType": "semver" }, { "version": "3.2.67", "lessThan": "3.3", "status": "affected", "versionType": "semver" }, { "version": "3.4.107", "lessThan": "3.5", "status": "affected", "versionType": "semver" }, { "version": "3.10.64", "lessThan": "3.11", "status": "affected", "versionType": "semver" }, { "version": "3.12.36", "lessThan": "3.13", "status": "affected", "versionType": "semver" }, { "version": "3.14.28", "lessThan": "3.15", "status": "affected", "versionType": "semver" }, { "version": "3.17.8", "lessThan": "3.18", "status": "affected", "versionType": "semver" }, { "version": "3.18.2", "lessThan": "3.19", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/isofs/rock.c" ], "versions": [ { "version": "3.19", "status": "affected" }, { "version": "0", "lessThan": "3.19", "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": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.88", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.30", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.7", "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": "3.19", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.12.88" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.18.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "7.0.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32.66" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2.67" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4.107" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10.64" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14.28" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8356fb821016797f5677cbeee5ddc0d32a95b4be" }, { "url": "https://git.kernel.org/stable/c/d582e12378bc1637f337622feef762f53c43fd57" }, { "url": "https://git.kernel.org/stable/c/bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9" }, { "url": "https://git.kernel.org/stable/c/c9b37c8b73f6368e4750e5ccb0632c380b43c6e5" }, { "url": "https://git.kernel.org/stable/c/22b36fa081f38ab397c7697f9d539211b51a0cfc" }, { "url": "https://git.kernel.org/stable/c/e69da8eeab74b4f4505024c38a17bce060fe7df8" }, { "url": "https://git.kernel.org/stable/c/ef048470c90bc8c1b8318bb2ce329da9ef64b9fe" }, { "url": "https://git.kernel.org/stable/c/a36d990f591320e9dd379ab30063ebfe91d47e1f" } ], "title": "isofs: validate Rock Ridge CE continuation extent against volume size", "x_generator": { "engine": "bippy-1.2.0" } } } }