{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-46303: isofs: validate Rock Ridge CE continuation extent against volume size","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-46303","status":"final","version":"1","initial_release_date":"2026-06-08T15:46:30.642Z","current_release_date":"2026-06-14T04:30:03.992Z","revision_history":[{"date":"2026-06-08T15:46:30.642Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-46303 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-46303"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-46303"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/8356fb821016797f5677cbeee5ddc0d32a95b4be"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/d582e12378bc1637f337622feef762f53c43fd57"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/c9b37c8b73f6368e4750e5ccb0632c380b43c6e5"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/22b36fa081f38ab397c7697f9d539211b51a0cfc"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/e69da8eeab74b4f4505024c38a17bce060fe7df8"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/ef048470c90bc8c1b8318bb2ce329da9ef64b9fe"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/a36d990f591320e9dd379ab30063ebfe91d47e1f"}]},"product_tree":{"branches":[{"category":"vendor","name":"Linux","branches":[{"category":"product_name","name":"Linux","branches":[{"category":"product_version_range","name":">=f54e18f1b831c92f6512d2eedb224cd63d607d3d 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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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10","CSAFPID-11","CSAFPID-12","CSAFPID-13","CSAFPID-14","CSAFPID-15","CSAFPID-16","CSAFPID-17","CSAFPID-18","CSAFPID-19","CSAFPID-20","CSAFPID-21","CSAFPID-22","CSAFPID-23","CSAFPID-24","CSAFPID-25"],"fixed":["CSAFPID-26","CSAFPID-27","CSAFPID-28","CSAFPID-29","CSAFPID-30","CSAFPID-31","CSAFPID-32","CSAFPID-33","CSAFPID-34"]},"scores":[{"cvss_v3":{"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"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10","CSAFPID-11","CSAFPID-12","CSAFPID-13","CSAFPID-14","CSAFPID-15","CSAFPID-16","CSAFPID-17","CSAFPID-18","CSAFPID-19","CSAFPID-20","CSAFPID-21","CSAFPID-22","CSAFPID-23","CSAFPID-24","CSAFPID-25"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 0, 2.6.33, 22b36fa081f38ab397c7697f9d539211b51a0cfc, 3.3, 3.5, 3.11, 3.13, 3.15, 3.18, 3.19, 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1-rc2, 8356fb821016797f5677cbeee5ddc0d32a95b4be, a36d990f591320e9dd379ab30063ebfe91d47e1f, bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9, c9b37c8b73f6368e4750e5ccb0632c380b43c6e5, d582e12378bc1637f337622feef762f53c43fd57, e69da8eeab74b4f4505024c38a17bce060fe7df8, ef048470c90bc8c1b8318bb2ce329da9ef64b9fe.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10","CSAFPID-11","CSAFPID-12","CSAFPID-13","CSAFPID-14","CSAFPID-15","CSAFPID-16","CSAFPID-17","CSAFPID-18","CSAFPID-19","CSAFPID-20","CSAFPID-21","CSAFPID-22","CSAFPID-23","CSAFPID-24","CSAFPID-25"]}]}]}