wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()
In the Linux kernel, the following vulnerability has been resolved: wifi: at76c50x-usb: avoid length underflow in at76_guess_freq() at76_guess_freq() checks only that the received frame is at least a bare 802.11 header (24 bytes) before subtracting the fixed management-body offset: len -= el_off; For both beacon and probe response frames, el_off is 36. If the frame is shorter than el_off, subtracting it causes the calculated IE length to wrap. The length is eventually passed to cfg80211_find_elem_match() as a very large unsigned value, so the element walk runs beyond the RX skb. This path is reached from at76_rx_tasklet() while scanning. If the device delivers a truncated beacon or probe response, the oversized IE length causes an out-of-bounds read during scanning. Skip the IE lookup if the frame does not reach the variable elements, before subtracting el_off.
CVE-2026-68373
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-2026-68373
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": "1264b951463a00efebe1bb596499aaad620ec8af",
"lessThan": "cb831aff2f850f72bc5ff5ad77d0a70bb5a84061",
"versionType": "git"
},
{
"status": "affected",
"version": "1264b951463a00efebe1bb596499aaad620ec8af",
"lessThan": "4875680d1703f56afa6257ba30244f2fb44ed205",
"versionType": "git"
},
{
"status": "affected",
"version": "1264b951463a00efebe1bb596499aaad620ec8af",
"lessThan": "b406f33d234f98c8b310fdab5cbb492d85e98e49",
"versionType": "git"
},
{
"status": "affected",
"version": "1264b951463a00efebe1bb596499aaad620ec8af",
"lessThan": "e165a1d295e7e814e13b0f92c86e5d48309509ce",
"versionType": "git"
},
{
"status": "affected",
"version": "1264b951463a00efebe1bb596499aaad620ec8af",
"lessThan": "bcde7249d45f52f994a9872bedf45994472ade77",
"versionType": "git"
},
{
"status": "affected",
"version": "1264b951463a00efebe1bb596499aaad620ec8af",
"lessThan": "fb1b50ab699211e777dca5ccfb648788b6a6e519",
"versionType": "git"
},
{
"status": "affected",
"version": "1264b951463a00efebe1bb596499aaad620ec8af",
"lessThan": "f742d9c98b5c504fc9e6744eef13a721c2aea486",
"versionType": "git"
},
{
"status": "affected",
"version": "1264b951463a00efebe1bb596499aaad620ec8af",
"lessThan": "61a799ffd1e5a4fd3702d547828b7ff3d161468e",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/wireless/atmel/at76c50x-usb.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.30"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.30",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/wireless/atmel/at76c50x-usb.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68373
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41704 · Revision 1
- Added to Heist Feed
- Publisher date