CVE-2026-46303

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf54e18f1b831c92f6512d2eedb224cd63d607d3d < 8356fb821016797f5677cbeee5ddc0d32a95b4beaffected
LinuxLinuxf54e18f1b831c92f6512d2eedb224cd63d607d3d < d582e12378bc1637f337622feef762f53c43fd57affected
LinuxLinuxf54e18f1b831c92f6512d2eedb224cd63d607d3d < bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9affected
LinuxLinuxf54e18f1b831c92f6512d2eedb224cd63d607d3d < c9b37c8b73f6368e4750e5ccb0632c380b43c6e5affected
LinuxLinuxf54e18f1b831c92f6512d2eedb224cd63d607d3d < 22b36fa081f38ab397c7697f9d539211b51a0cfcaffected
LinuxLinuxf54e18f1b831c92f6512d2eedb224cd63d607d3d < e69da8eeab74b4f4505024c38a17bce060fe7df8affected
LinuxLinuxf54e18f1b831c92f6512d2eedb224cd63d607d3d < ef048470c90bc8c1b8318bb2ce329da9ef64b9feaffected
LinuxLinuxf54e18f1b831c92f6512d2eedb224cd63d607d3d < a36d990f591320e9dd379ab30063ebfe91d47e1faffected
LinuxLinux08313e26e06d4aa9ce1cbba1a8e359e9cab9ad56affected
LinuxLinux212c4d33ca83e2144064fe9c2911607fbed5386faffected
LinuxLinux96e44adce250199ec9b2b928be66365779ff1b59affected
LinuxLinux1fe5620fcd6c2f0a4a927ee10c8e53196da392f3affected
LinuxLinuxfbce0d7dc8965c9fb8d411862040239d4a768c71affected
LinuxLinux8190393a88f2b0321263a54f2a9eb5a2aa43be7eaffected
LinuxLinux486aa789eadcf44ed87f972b209299c516454693affected
LinuxLinuxb6d20edb6e7cedb4eedb9e0193d20dd488ebae84affected
LinuxLinux2.6.32.66 < 2.6.33affected
LinuxLinux3.2.67 < 3.3affected
LinuxLinux3.4.107 < 3.5affected
LinuxLinux3.10.64 < 3.11affected
LinuxLinux3.12.36 < 3.13affected
LinuxLinux3.14.28 < 3.15affected
LinuxLinux3.17.8 < 3.18affected
LinuxLinux3.18.2 < 3.19affected
LinuxLinux3.19affected
LinuxLinux0 < 3.19unaffected
LinuxLinux5.10.258 <= 5.10.*unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.140 <= 6.6.*unaffected
LinuxLinux6.12.88 <= 6.12.*unaffected
LinuxLinux6.18.30 <= 6.18.*unaffected
LinuxLinux7.0.7 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References