CVE-2026-46303 (GCVE-0-2026-46303)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:46 – Updated: 2026-06-14 18:07
VLAI
Title
isofs: validate Rock Ridge CE continuation extent against volume size
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.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < 8356fb821016797f5677cbeee5ddc0d32a95b4be (git)
Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < d582e12378bc1637f337622feef762f53c43fd57 (git)
Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9 (git)
Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < c9b37c8b73f6368e4750e5ccb0632c380b43c6e5 (git)
Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < 22b36fa081f38ab397c7697f9d539211b51a0cfc (git)
Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < e69da8eeab74b4f4505024c38a17bce060fe7df8 (git)
Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < ef048470c90bc8c1b8318bb2ce329da9ef64b9fe (git)
Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < a36d990f591320e9dd379ab30063ebfe91d47e1f (git)
Affected: 08313e26e06d4aa9ce1cbba1a8e359e9cab9ad56 (git)
Affected: 212c4d33ca83e2144064fe9c2911607fbed5386f (git)
Affected: 96e44adce250199ec9b2b928be66365779ff1b59 (git)
Affected: 1fe5620fcd6c2f0a4a927ee10c8e53196da392f3 (git)
Affected: fbce0d7dc8965c9fb8d411862040239d4a768c71 (git)
Affected: 8190393a88f2b0321263a54f2a9eb5a2aa43be7e (git)
Affected: 486aa789eadcf44ed87f972b209299c516454693 (git)
Affected: b6d20edb6e7cedb4eedb9e0193d20dd488ebae84 (git)
Affected: 2.6.32.66 , < 2.6.33 (semver)
Affected: 3.2.67 , < 3.3 (semver)
Affected: 3.4.107 , < 3.5 (semver)
Affected: 3.10.64 , < 3.11 (semver)
Affected: 3.12.36 , < 3.13 (semver)
Affected: 3.14.28 , < 3.15 (semver)
Affected: 3.17.8 , < 3.18 (semver)
Affected: 3.18.2 , < 3.19 (semver)
Create a notification for this product.
Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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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."
        }
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            "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"
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      "providerMetadata": {
        "dateUpdated": "2026-06-14T18:07:47.782Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/d582e12378bc1637f337622feef762f53c43fd57"
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          "url": "https://git.kernel.org/stable/c/bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9"
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        },
        {
          "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": "2026-06-14T18:07:47.782Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46303",
      "date": "2026-06-17",
      "epss": "0.00278",
      "percentile": "0.19401"
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  }
}


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Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.