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CVE PROGRAM SOURCE RECORD8.2 High

CVE-2026-46303

isofs: validate Rock Ridge CE continuation extent against volume size

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • f54e18f1b831c92f6512d2eedb224cd63d607d3d to < 8356fb821016797f5677cbeee5ddc0d32a95b4beaffected
  • f54e18f1b831c92f6512d2eedb224cd63d607d3d to < d582e12378bc1637f337622feef762f53c43fd57affected
  • f54e18f1b831c92f6512d2eedb224cd63d607d3d to < bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9affected
  • f54e18f1b831c92f6512d2eedb224cd63d607d3d to < c9b37c8b73f6368e4750e5ccb0632c380b43c6e5affected
  • f54e18f1b831c92f6512d2eedb224cd63d607d3d to < 22b36fa081f38ab397c7697f9d539211b51a0cfcaffected
  • f54e18f1b831c92f6512d2eedb224cd63d607d3d to < e69da8eeab74b4f4505024c38a17bce060fe7df8affected
  • f54e18f1b831c92f6512d2eedb224cd63d607d3d to < ef048470c90bc8c1b8318bb2ce329da9ef64b9feaffected
  • f54e18f1b831c92f6512d2eedb224cd63d607d3d to < a36d990f591320e9dd379ab30063ebfe91d47e1faffected
  • 08313e26e06d4aa9ce1cbba1a8e359e9cab9ad56affected
  • 212c4d33ca83e2144064fe9c2911607fbed5386faffected
  • 96e44adce250199ec9b2b928be66365779ff1b59affected
  • 1fe5620fcd6c2f0a4a927ee10c8e53196da392f3affected
  • fbce0d7dc8965c9fb8d411862040239d4a768c71affected
  • 8190393a88f2b0321263a54f2a9eb5a2aa43be7eaffected
  • 486aa789eadcf44ed87f972b209299c516454693affected
  • b6d20edb6e7cedb4eedb9e0193d20dd488ebae84affected
  • 2.6.32.66 to < 2.6.33affected
  • 3.2.67 to < 3.3affected
  • 3.4.107 to < 3.5affected
  • 3.10.64 to < 3.11affected
  • 3.12.36 to < 3.13affected
  • 3.14.28 to < 3.15affected
  • 3.17.8 to < 3.18affected
  • 3.18.2 to < 3.19affected

Linux Linux

Default version status: affected

  • 3.19affected
  • 0 to < 3.19unaffected
  • 5.10.258 to ≤ 5.10.*unaffected
  • 5.15.209 to ≤ 5.15.*unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.140 to ≤ 6.6.*unaffected
  • 6.12.88 to ≤ 6.12.*unaffected
  • 6.18.30 to ≤ 6.18.*unaffected
  • 7.0.7 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References