net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size
In the Linux kernel, the following vulnerability has been resolved: net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size mv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while dumping the policy IDR, clobbering the input value before it has been looked at. That input is the number of entries the caller had room for. ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the ioctl sizes the buffer from the rule_cnt userspace passes in, so once an admin has installed policy rules any user can ask for fewer slots than there are rules and run off the end of the allocation. A rule_cnt of 0 leaves the buffer pointer NULL and the walk dereferences it. Count into a local so the caller's limit survives the walk, and stop with -EMSGSIZE once it is reached.
CVE-2026-98027
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-2026-98027
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": [
{
"status": "affected",
"version": "da7dc87553046a43be1620a783ce3d9f6583d322",
"lessThan": "7e4bfc5f0b66feb22cba821303fc25ca22cd0887",
"versionType": "git"
},
{
"status": "affected",
"version": "da7dc87553046a43be1620a783ce3d9f6583d322",
"lessThan": "01124cd2cf4b71755b1130ac82d78dcfbd5d69e3",
"versionType": "git"
},
{
"status": "affected",
"version": "da7dc87553046a43be1620a783ce3d9f6583d322",
"lessThan": "609c4378f212cf580aae02250f1146caf63d873f",
"versionType": "git"
},
{
"status": "affected",
"version": "da7dc87553046a43be1620a783ce3d9f6583d322",
"lessThan": "c5b5c52b6524c9fb50def2260baac745c095ec3a",
"versionType": "git"
},
{
"status": "affected",
"version": "da7dc87553046a43be1620a783ce3d9f6583d322",
"lessThan": "44cd4674d9aa5bdf793b8a8b481c9e8536ed6070",
"versionType": "git"
},
{
"status": "affected",
"version": "da7dc87553046a43be1620a783ce3d9f6583d322",
"lessThan": "7a683c2b062810bca203e41866389daf387c235b",
"versionType": "git"
},
{
"status": "affected",
"version": "da7dc87553046a43be1620a783ce3d9f6583d322",
"lessThan": "cda5ac8fe8ac8e80b1703ebb8c4250726fc19739",
"versionType": "git"
},
{
"status": "affected",
"version": "da7dc87553046a43be1620a783ce3d9f6583d322",
"lessThan": "b1fffc273112e7284c5b705e186b43b5770cd3d5",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/dsa/mv88e6xxx/chip.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/dsa/mv88e6xxx/chip.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98027
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #38152 · Revision 1
- Added to Heist Feed
- Publisher date