isofs: validate Rock Ridge CE continuation extent against volume size
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 offs
CVE-2026-46303
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-46303
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
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"version": "f54e18f1b831c92f6512d2eedb224cd63d607d3d",
"lessThan": "8356fb821016797f5677cbeee5ddc0d32a95b4be",
"versionType": "git"
},
{
"status": "affected",
"version": "f54e18f1b831c92f6512d2eedb224cd63d607d3d",
"lessThan": "d582e12378bc1637f337622feef762f53c43fd57",
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{
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{
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"versionType": "git"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"version": "b6d20edb6e7cedb4eedb9e0193d20dd488ebae84",
"versionType": "git"
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{
"status": "affected",
"version": "2.6.32.66",
"lessThan": "2.6.33",
"versionType": "semver"
},
{
"status": "affected",
"version": "3.2.67",
"lessThan": "3.3",
"versionType": "semver"
},
{
"status": "affected",
"version": "3.4.107",
"lessThan": "3.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "3.10.64",
"lessThan": "3.11",
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{
"status": "affected",
"version": "3.12.36",
"lessThan": "3.13",
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{
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"lessThan": "3.15",
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{
"status": "affected",
"version": "3.17.8",
"lessThan": "3.18",
"versionType": "semver"
},
{
"status": "affected",
"version": "3.18.2",
"lessThan": "3.19",
"versionType": "semver"
}
],
"programFiles": [
"fs/isofs/rock.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
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{
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"version": "0",
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{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.140",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.88",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.30",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.7",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/isofs/rock.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46303
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #28415 · Revision 1
- Added to Heist Feed
- Publisher date