CVE-2026-46303
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk20th percentile - higher than 20% of all known CVEs
Summary
A vulnerability was found in the Linux kernel's ISO 9660 filesystem (isofs) related to Rock Ridge extension validation. The rock_continue() function reads the extent block number from the CE record without checking if it is within the mounted volume bounds, potentially leading to out-of-range reads or reads from adjacent filesystems. Although no memory safety violation occurs, it may enable information leakage via readlink().
Risk Assessment
The organization risks potential data leakage from adjacent filesystems on the same block device if a crafted ISO is mounted. The attack requires physical access to an optical drive or CAP_SYS_ADMIN privileges, limiting risk in typical server environments.
Recommendation
Immediately update the Linux kernel to a version containing the fix that adds block number validation in the rock_continue() function. For systems that cannot be updated, restrict mounting of untrusted ISO images and disable automatic optical drive mounting.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: isofs: validate Rock Ridge CE continuation extent against volume size rock_continue() reads rs->cont_extent verbatim from the Rock Ridge CE record and passes it to sb_bread() without checking that the block number is within the mounted ISO 9660 volume. commit e595447e177b ("[PATCH] rock.c: handle corrupted directories") added cont_offset and cont_size rejection for the CE continuation but did not validate the extent block number itself. commit f54e18f1b831 ("isofs: Fix infinite looping over CE entries") later capped the CE chain length at RR_MAX_CE_ENTRIES = 32 but again left the block number unchecked. With a crafted ISO mounted via udisks2 (desktop optical auto-mount) or via CAP_SYS_ADMIN mount, rs->cont_extent can therefore point at an out-of-range block or at blocks belonging to an adjacent filesystem on the same block device. sb_bread() on an out-of-range block returns NULL cleanly via the block layer EIO path, so there is no memory-safety violation. For in-range reads of adjacent- filesystem data, the CE buffer is parsed as Rock Ridge records and only the text of SL sub-records reaches userspace through readlink(), which makes the info-leak channel narrow and difficult to exploit; still, rejecting the malformed CE outright matches the rejection shape already present in the same function for cont_offset and cont_size. Add an ISOFS_SB(sb)->s_nzones bounds check to rock_continue() next to the existing offset/size rejection, printing the same corrupted-directory-entry notice.