isofs: validate Rock Ridge CE continuation extent against volume size
Summary
| CVE | CVE-2026-46303 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-08 17:16:48 UTC |
| Updated | 2026-06-08 17:16:48 UTC |
| 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. |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected f54e18f1b831c92f6512d2eedb224cd63d607d3d 8356fb821016797f5677cbeee5ddc0d32a95b4be git | Not specified |
| CNA | Linux | Linux | affected f54e18f1b831c92f6512d2eedb224cd63d607d3d d582e12378bc1637f337622feef762f53c43fd57 git | Not specified |
| CNA | Linux | Linux | affected f54e18f1b831c92f6512d2eedb224cd63d607d3d bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9 git | Not specified |
| CNA | Linux | Linux | affected f54e18f1b831c92f6512d2eedb224cd63d607d3d c9b37c8b73f6368e4750e5ccb0632c380b43c6e5 git | Not specified |
| CNA | Linux | Linux | affected f54e18f1b831c92f6512d2eedb224cd63d607d3d 22b36fa081f38ab397c7697f9d539211b51a0cfc git | Not specified |
| CNA | Linux | Linux | affected f54e18f1b831c92f6512d2eedb224cd63d607d3d e69da8eeab74b4f4505024c38a17bce060fe7df8 git | Not specified |
| CNA | Linux | Linux | affected f54e18f1b831c92f6512d2eedb224cd63d607d3d ef048470c90bc8c1b8318bb2ce329da9ef64b9fe git | Not specified |
| CNA | Linux | Linux | affected f54e18f1b831c92f6512d2eedb224cd63d607d3d a36d990f591320e9dd379ab30063ebfe91d47e1f git | Not specified |
| CNA | Linux | Linux | affected 08313e26e06d4aa9ce1cbba1a8e359e9cab9ad56 git | Not specified |
| CNA | Linux | Linux | affected 212c4d33ca83e2144064fe9c2911607fbed5386f git | Not specified |
| CNA | Linux | Linux | affected 96e44adce250199ec9b2b928be66365779ff1b59 git | Not specified |
| CNA | Linux | Linux | affected 1fe5620fcd6c2f0a4a927ee10c8e53196da392f3 git | Not specified |
| CNA | Linux | Linux | affected fbce0d7dc8965c9fb8d411862040239d4a768c71 git | Not specified |
| CNA | Linux | Linux | affected 8190393a88f2b0321263a54f2a9eb5a2aa43be7e git | Not specified |
| CNA | Linux | Linux | affected 486aa789eadcf44ed87f972b209299c516454693 git | Not specified |
| CNA | Linux | Linux | affected b6d20edb6e7cedb4eedb9e0193d20dd488ebae84 git | Not specified |
| CNA | Linux | Linux | affected 2.6.32.66 2.6.33 semver | Not specified |
| CNA | Linux | Linux | affected 3.2.67 3.3 semver | Not specified |
| CNA | Linux | Linux | affected 3.4.107 3.5 semver | Not specified |
| CNA | Linux | Linux | affected 3.10.64 3.11 semver | Not specified |
| CNA | Linux | Linux | affected 3.12.36 3.13 semver | Not specified |
| CNA | Linux | Linux | affected 3.14.28 3.15 semver | Not specified |
| CNA | Linux | Linux | affected 3.17.8 3.18 semver | Not specified |
| CNA | Linux | Linux | affected 3.18.2 3.19 semver | Not specified |
| CNA | Linux | Linux | affected 3.19 | Not specified |
| CNA | Linux | Linux | unaffected 3.19 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.258 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.209 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.175 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.140 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.88 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.30 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.7 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1-rc2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/8356fb821016797f5677cbeee5ddc0d32a95b4be | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e69da8eeab74b4f4505024c38a17bce060fe7df8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/22b36fa081f38ab397c7697f9d539211b51a0cfc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d582e12378bc1637f337622feef762f53c43fd57 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a36d990f591320e9dd379ab30063ebfe91d47e1f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c9b37c8b73f6368e4750e5ccb0632c380b43c6e5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ef048470c90bc8c1b8318bb2ce329da9ef64b9fe | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.