CVE-2026-46303 (GCVE-0-2026-46303)
Vulnerability from cvelistv5
Published
2026-06-08 15:46
Modified
2026-08-05 12:31
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: f54e18f1b831c92f6512d2eedb224cd63d607d3d
Version: f54e18f1b831c92f6512d2eedb224cd63d607d3d
Version: f54e18f1b831c92f6512d2eedb224cd63d607d3d
Version: f54e18f1b831c92f6512d2eedb224cd63d607d3d
Version: f54e18f1b831c92f6512d2eedb224cd63d607d3d
Version: f54e18f1b831c92f6512d2eedb224cd63d607d3d
Version: f54e18f1b831c92f6512d2eedb224cd63d607d3d
Version: f54e18f1b831c92f6512d2eedb224cd63d607d3d
Version: 08313e26e06d4aa9ce1cbba1a8e359e9cab9ad56
Version: 212c4d33ca83e2144064fe9c2911607fbed5386f
Version: 96e44adce250199ec9b2b928be66365779ff1b59
Version: 1fe5620fcd6c2f0a4a927ee10c8e53196da392f3
Version: fbce0d7dc8965c9fb8d411862040239d4a768c71
Version: 8190393a88f2b0321263a54f2a9eb5a2aa43be7e
Version: 486aa789eadcf44ed87f972b209299c516454693
Version: b6d20edb6e7cedb4eedb9e0193d20dd488ebae84
Version: 2.6.32.66   ≤
Version: 3.2.67   ≤
Version: 3.4.107   ≤
Version: 3.10.64   ≤
Version: 3.12.36   ≤
Version: 3.14.28   ≤
Version: 3.17.8   ≤
Version: 3.18.2   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nisofs: validate Rock Ridge CE continuation extent against volume size\n\nrock_continue() reads rs-\u003econt_extent verbatim from the Rock Ridge CE\nrecord and passes it to sb_bread() without checking that the block\nnumber is within the mounted ISO 9660 volume.  commit e595447e177b\n(\"[PATCH] rock.c: handle corrupted directories\") added cont_offset\nand cont_size rejection for the CE continuation but did not validate\nthe extent block number itself.  commit f54e18f1b831 (\"isofs: Fix\ninfinite looping over CE entries\") later capped the CE chain length\nat RR_MAX_CE_ENTRIES = 32 but again left the block number unchecked.\n\nWith a crafted ISO mounted via udisks2 (desktop optical auto-mount)\nor via CAP_SYS_ADMIN mount, rs-\u003econt_extent can therefore point at\nan out-of-range block or at blocks belonging to an adjacent\nfilesystem on the same block device.  sb_bread() on an out-of-range\nblock returns NULL cleanly via the block layer EIO path, so there\nis no memory-safety violation.  For in-range reads of adjacent-\nfilesystem data, the CE buffer is parsed as Rock Ridge records and\nonly the text of SL sub-records reaches userspace through\nreadlink(), which makes the info-leak channel narrow and difficult\nto exploit; still, rejecting the malformed CE outright matches the\nrejection shape already present in the same function for\ncont_offset and cont_size.\n\nAdd an ISOFS_SB(sb)-\u003es_nzones bounds check to rock_continue() next\nto the existing offset/size rejection, printing the same\ncorrupted-directory-entry notice."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - isofs supports NFS export (export.c), and nfsd_readlink()/LOOKUP on an exported mount reach rock_continue() through vfs_get_link() and isofs_iget() without any local syscall on the attacking host.\nAC:L - The attacker fully controls CE extent, offset, and size in a crafted ISO image, so triggering the bad sb_bread() path is reliable once the image is mounted and accessed.\nPR:N - A remote NFS client needs only network access to an exported isofs mount to invoke symlink readlink and directory inode parsing; no CAP_SYS_ADMIN or host root on the attacker\u0027s machine is required.\nUI:N - An attacker with a local shell can loop-mount a malicious ISO inside a user namespace (CAP_SYS_ADMIN there) and trigger exploitation without any separate victim action.\nS:U - Impact is unauthorized kernel-mediated reads and limited inode metadata skew on the same host; there is no VM escape, sandbox breakout, or cross-security-authority boundary change.\nC:H - In-range CE extents can cause sb_bread() to fetch blocks from an adjacent filesystem on the same device, and mis-parsed Rock Ridge SL text is returned to userspace through readlink(), constituting unauthorized data disclosure.\nI:L - Adjacent-block data parsed as Rock Ridge PX/PN/CL records during inode setup can overwrite inode mode, ownership, device numbers, or relocation fields, but there is no arbitrary kernel write or memory corruption.\nA:N - Out-of-range blocks fail cleanly through sb_bread()\u0027s NULL/EIO path with no oops, panic, or hang; errors propagate as -EIO to the calling syscall or NFS operation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:06.574Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8356fb821016797f5677cbeee5ddc0d32a95b4be"
        },
        {
          "url": "https://git.kernel.org/stable/c/d582e12378bc1637f337622feef762f53c43fd57"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9b37c8b73f6368e4750e5ccb0632c380b43c6e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/22b36fa081f38ab397c7697f9d539211b51a0cfc"
        },
        {
          "url": "https://git.kernel.org/stable/c/e69da8eeab74b4f4505024c38a17bce060fe7df8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef048470c90bc8c1b8318bb2ce329da9ef64b9fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/a36d990f591320e9dd379ab30063ebfe91d47e1f"
        }
      ],
      "title": "isofs: validate Rock Ridge CE continuation extent against volume size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46303",
    "datePublished": "2026-06-08T15:46:30.642Z",
    "dateReserved": "2026-05-13T15:03:33.111Z",
    "dateUpdated": "2026-08-05T12:31:06.574Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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