CVE-2026-68373 (GCVE-0-2026-68373)
Vulnerability from cvelistv5
Published
2026-08-10 12:03
Modified
2026-08-19 16:34
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 1264b951463a00efebe1bb596499aaad620ec8af Version: 1264b951463a00efebe1bb596499aaad620ec8af Version: 1264b951463a00efebe1bb596499aaad620ec8af Version: 1264b951463a00efebe1bb596499aaad620ec8af Version: 1264b951463a00efebe1bb596499aaad620ec8af Version: 1264b951463a00efebe1bb596499aaad620ec8af Version: 1264b951463a00efebe1bb596499aaad620ec8af Version: 1264b951463a00efebe1bb596499aaad620ec8af |
||
{
"containers": {
"cna": {
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"product": "Linux",
"programFiles": [
"drivers/net/wireless/atmel/at76c50x-usb.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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],
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"vendor": "Linux",
"versions": [
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"version": "2.6.30"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
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},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"vulnerable": true
},
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: at76c50x-usb: avoid length underflow in at76_guess_freq()\n\nat76_guess_freq() checks only that the received frame is at least a bare\n802.11 header (24 bytes) before subtracting the fixed management-body\noffset:\n\n\tlen -= el_off;\n\nFor both beacon and probe response frames, el_off is 36. If the frame is\nshorter than el_off, subtracting it causes the calculated IE length to\nwrap. The length is eventually passed to cfg80211_find_elem_match() as a\nvery large unsigned value, so the element walk runs beyond the RX skb.\n\nThis path is reached from at76_rx_tasklet() while scanning. If the device\ndelivers a truncated beacon or probe response, the oversized IE length\ncauses an out-of-bounds read during scanning.\n\nSkip the IE lookup if the frame does not reach the variable elements,\nbefore subtracting el_off."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The malformed frame is an over-the-air 802.11 beacon or probe response received by the at76c50x USB WLAN dongle and parsed in at76_rx_tasklet(); an attacker only needs to be within radio range of the victim, which is the adjacent-network (WiFi frame injection) case.\nAC:L - The attacker simply transmits a beacon/probe response whose body is shorter than the 36-byte fixed management offset with a valid FCS, and can repeat it continuously or answer the victim\u0027s probe requests during the routine scans that set priv-\u003escanning, so triggering is reliable and fully attacker-timed.\nPR:N - No authentication, association, or any local privilege is required; the frame is parsed during scanning before any association or key exchange, so an entirely unauthenticated radio-range attacker reaches the bug.\nUI:N - Background and periodic scans are issued automatically by wpa_supplicant/NetworkManager without any user action, so no victim interaction is needed for the vulnerable path to run.\nS:U - The out-of-bounds read stays within the kernel\u0027s own memory and security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The underflowed length becomes ~4GB when widened to unsigned int, so the element walk reads far past the ~2.5KB RX skb slab object, and the out-of-bounds byte taken as el[2] is turned into rx_status.freq that userspace observes in scan results, allowing repeated frames to leak adjacent kernel heap contents.\nI:N - The defect is purely a read overrun; nothing outside the skb is written and the only attacker-influenced value is the reported channel/frequency, giving no memory-corruption or control-flow primitive.\nA:H - The unbounded element walk runs off the slab and can dereference unmapped memory while executing in tasklet/softirq context, producing a kernel oops or panic that the attacker can trigger repeatedly with injected frames."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:34:33.308Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/cb831aff2f850f72bc5ff5ad77d0a70bb5a84061"
},
{
"url": "https://git.kernel.org/stable/c/4875680d1703f56afa6257ba30244f2fb44ed205"
},
{
"url": "https://git.kernel.org/stable/c/b406f33d234f98c8b310fdab5cbb492d85e98e49"
},
{
"url": "https://git.kernel.org/stable/c/e165a1d295e7e814e13b0f92c86e5d48309509ce"
},
{
"url": "https://git.kernel.org/stable/c/bcde7249d45f52f994a9872bedf45994472ade77"
},
{
"url": "https://git.kernel.org/stable/c/fb1b50ab699211e777dca5ccfb648788b6a6e519"
},
{
"url": "https://git.kernel.org/stable/c/f742d9c98b5c504fc9e6744eef13a721c2aea486"
},
{
"url": "https://git.kernel.org/stable/c/61a799ffd1e5a4fd3702d547828b7ff3d161468e"
}
],
"title": "wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68373",
"datePublished": "2026-08-10T12:03:51.663Z",
"dateReserved": "2026-07-30T09:28:09.386Z",
"dateUpdated": "2026-08-19T16:34:33.308Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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