{"id":"CVE-2026-46303","summary":"isofs: validate Rock Ridge CE continuation extent against volume size","details":"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-\u003econt_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-\u003econt_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)-\u003es_nzones bounds check to rock_continue() next\nto the existing offset/size rejection, printing the same\ncorrupted-directory-entry notice.","modified":"2026-07-09T03:52:29.967161152Z","published":"2026-06-08T15:46:30.642Z","related":["openSUSE-SU-2026:11014-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46303.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/22b36fa081f38ab397c7697f9d539211b51a0cfc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8356fb821016797f5677cbeee5ddc0d32a95b4be"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a36d990f591320e9dd379ab30063ebfe91d47e1f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c9b37c8b73f6368e4750e5ccb0632c380b43c6e5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d582e12378bc1637f337622feef762f53c43fd57"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e69da8eeab74b4f4505024c38a17bce060fe7df8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ef048470c90bc8c1b8318bb2ce329da9ef64b9fe"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46303.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46303"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f54e18f1b831c92f6512d2eedb224cd63d607d3d"},{"fixed":"8356fb821016797f5677cbeee5ddc0d32a95b4be"},{"fixed":"d582e12378bc1637f337622feef762f53c43fd57"},{"fixed":"bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9"},{"fixed":"c9b37c8b73f6368e4750e5ccb0632c380b43c6e5"},{"fixed":"22b36fa081f38ab397c7697f9d539211b51a0cfc"},{"fixed":"e69da8eeab74b4f4505024c38a17bce060fe7df8"},{"fixed":"ef048470c90bc8c1b8318bb2ce329da9ef64b9fe"},{"fixed":"a36d990f591320e9dd379ab30063ebfe91d47e1f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"08313e26e06d4aa9ce1cbba1a8e359e9cab9ad56"},{"last_affected":"212c4d33ca83e2144064fe9c2911607fbed5386f"},{"last_affected":"96e44adce250199ec9b2b928be66365779ff1b59"},{"last_affected":"1fe5620fcd6c2f0a4a927ee10c8e53196da392f3"},{"last_affected":"fbce0d7dc8965c9fb8d411862040239d4a768c71"},{"last_affected":"8190393a88f2b0321263a54f2a9eb5a2aa43be7e"},{"last_affected":"486aa789eadcf44ed87f972b209299c516454693"},{"last_affected":"b6d20edb6e7cedb4eedb9e0193d20dd488ebae84"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2.6.32.66"},{"fixed":"2.6.33"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.2.67"},{"fixed":"3.3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.4.107"},{"fixed":"3.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.10.64"},{"fixed":"3.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.12.36"},{"fixed":"3.13"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.14.28"},{"fixed":"3.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.17.8"},{"fixed":"3.18"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.18.2"},{"fixed":"3.19"}]}],"versions":["v2.6.32.65","v3.4.106","v3.2.66","v3.4.105","v3.18-rc1","v3.18.1","v3.17.7","v3.14.27","v3.10.63","v3.18","v3.12.35","v3.2.65","v3.17.6","v3.14.26","v3.10.62","v3.2.64","v2.6.32.64","v3.18-rc7","v3.17.5","v3.17.4","v3.14.25","v3.10.61","v3.12.34","v3.18-rc6","v3.18-rc2","v3.18-rc3","v3.4.104","v3.18-rc4","v3.18-rc5","v2.6.32.63","v3.17.3","v3.14.24","v3.10.60","v3.12.33","v3.17","v3.17.2","v3.14.23","v3.10.59","v3.2.63","v3.12.32","v3.17.1","v3.14.22","v3.10.58","v3.17-rc1","v3.12.31","v3.14.21","v3.10.57","v3.17-rc7","v3.14.20","v3.10.56","v3.17-rc2","v3.10.55","v3.14.19","v3.17-rc4","v3.16","v3.17-rc5","v3.17-rc6","v3.12.30","v3.12.29","v3.4.103","v3.14.18","v3.10.54","v3.17-rc3","v3.2.62","v3.12.28","v3.14.17","v3.10.53","v3.12.27","v3.16-rc7","v3.14.16","v3.10.52","v3.4.102","v3.14.15","v3.10.51","v3.4.101","v3.2.61","v3.16-rc1","v3.16-rc3","v3.4.100","v3.10.50","v3.14.14","v3.12.26","v3.16-rc5","v3.16-rc6","v3.14.13","v3.10.49","v3.4.99","v3.16-rc2","v3.16-rc4","v3.12.25","v3.14.12","v3.10.48","v3.4.98","v3.12.24","v3.13","v3.2.60","v3.14.11","v3.10.47","v3.4.97","v3.15","v3.14.10","v3.10.46","v3.4.96","v3.14.9","v3.10.45","v3.4.95","v3.14.8","v3.10.44","v3.4.94","v3.12.23","v2.6.32.62","v3.12.22","v3.4.93","v3.10.43","v3.14.7","v3.4.92","v3.10.42","v3.14.6","v3.1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