Veille CVE
CVE-2026-46303
8.2 ÉlevéeDescription
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.
Produits concernés
Scores CVSS
| Version | Score | Source | Vecteur |
|---|---|---|---|
| 3.1 | 8.2 Élevée | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N |
Faiblesses (CWE)
Références
- https://git.kernel.org/stable/c/22b36fa081f38ab397c7697f9d539211b51a0cfc Patch
- https://git.kernel.org/stable/c/8356fb821016797f5677cbeee5ddc0d32a95b4be Patch
- https://git.kernel.org/stable/c/a36d990f591320e9dd379ab30063ebfe91d47e1f Patch
- https://git.kernel.org/stable/c/bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9 Patch
- https://git.kernel.org/stable/c/c9b37c8b73f6368e4750e5ccb0632c380b43c6e5 Patch
- https://git.kernel.org/stable/c/d582e12378bc1637f337622feef762f53c43fd57 Patch
- https://git.kernel.org/stable/c/e69da8eeab74b4f4505024c38a17bce060fe7df8 Patch
- https://git.kernel.org/stable/c/ef048470c90bc8c1b8318bb2ce329da9ef64b9fe Patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html