wifi: mac80211: minstrel_ht: validate fixed rate index
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: minstrel_ht: validate fixed rate index The fixed_rate_idx debugfs file is a plain u32 attribute, so any value can be written to it. minstrel_ht_update_stats() then copies the value into mi->max_tp_rate[] and mi->max_prob_rate, and minstrel_ht_set_rate() uses MI_RATE_GROUP()/MI_RATE_IDX() to index minstrel_mcs_groups[] (42 entries) and mi->groups[].rates[] (10 entries) with it. Writing e.g. 65535 selects group 4095 and rate index 15, far outside both arrays. The out-of-bounds entries are dereferenced and updated as struct minstrel_rate_stats (retry counts, etc.), so the invalid index corrupts adjacent kernel memory. With CONFIG_UBSAN_BOUNDS the access is reported as an array-index-out-of-bounds in minstrel_ht_set_rate(). Only a valid group/rate pair, or U32_MAX to disable fixed rate processing, can be used safely, so reject any other value when the debugfs file is written. The file is only reachable through a root-only debugfs mount, so this is not a privilege boundary. The out-of-bounds access is still a bug that must not be reachable through a writable debugfs attribute.
CVE-2026-98703
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-2026-98703
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": "24f7580e852b5472b51eea322bb78454df0054b8",
"lessThan": "eebc70f132041b35da9ec74d5d395083125289b2",
"versionType": "git"
},
{
"status": "affected",
"version": "24f7580e852b5472b51eea322bb78454df0054b8",
"lessThan": "f8ab6ae1fa360b0191252677f41e781dcb0ffe6e",
"versionType": "git"
},
{
"status": "affected",
"version": "24f7580e852b5472b51eea322bb78454df0054b8",
"lessThan": "42aa9feb27b600809414a3c6b0c650bafba542a9",
"versionType": "git"
},
{
"status": "affected",
"version": "24f7580e852b5472b51eea322bb78454df0054b8",
"lessThan": "43082d604a9937b94ceb2e484403956d0f363324",
"versionType": "git"
},
{
"status": "affected",
"version": "24f7580e852b5472b51eea322bb78454df0054b8",
"lessThan": "15fb9e3cea55fbc378261ce35a32b0f8828f0000",
"versionType": "git"
}
],
"programFiles": [
"net/mac80211/rc80211_minstrel_ht.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/mac80211/rc80211_minstrel_ht.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98703
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48916 · Revision 1
- Added to Heist Feed
- Publisher date