CVE-2026-64351 (GCVE-0-2026-64351)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-08-17 04:53
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: usb: kalmia: bound RX frame length in kalmia_rx_fixup()
kalmia_rx_fixup() computes usb_packet_length = skb->len - (2 *
KALMIA_HEADER_LENGTH) as a u16, guarded only by a pre-loop check that
skb->len is at least KALMIA_HEADER_LENGTH, which is 6. A device can
deliver a short bulk-IN frame with skb->len in the 6 to 11 range, or
leave a short trailing remainder on a later loop iteration. Either case
underflows usb_packet_length to about 65530.
That bypasses the usb_packet_length < ether_packet_length truncation path.
The device-supplied ether_packet_length, a le16 up to 65535 read from
header_start[2], then drives a memcmp() and the following skb_trim() and
skb_pull() past the end of the rx buffer. The rx buffer is hard_mtu * 10,
which is 14000 bytes. That is an out of bounds read.
Require both the start and end framing headers to be present before
subtracting them, on every loop iteration.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: d40261236e8e278cb1936cb5e934262971692b10 Version: d40261236e8e278cb1936cb5e934262971692b10 Version: d40261236e8e278cb1936cb5e934262971692b10 Version: d40261236e8e278cb1936cb5e934262971692b10 Version: d40261236e8e278cb1936cb5e934262971692b10 Version: d40261236e8e278cb1936cb5e934262971692b10 Version: d40261236e8e278cb1936cb5e934262971692b10 Version: d40261236e8e278cb1936cb5e934262971692b10 |
||
{
"containers": {
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"product": "Linux",
"programFiles": [
"drivers/net/usb/kalmia.c"
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"vendor": "Linux",
"versions": [
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"version": "3.0"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
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},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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"vulnerable": true
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}
],
"negate": false,
"operator": "OR"
}
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}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: kalmia: bound RX frame length in kalmia_rx_fixup()\n\nkalmia_rx_fixup() computes usb_packet_length = skb-\u003elen - (2 *\nKALMIA_HEADER_LENGTH) as a u16, guarded only by a pre-loop check that\nskb-\u003elen is at least KALMIA_HEADER_LENGTH, which is 6. A device can\ndeliver a short bulk-IN frame with skb-\u003elen in the 6 to 11 range, or\nleave a short trailing remainder on a later loop iteration. Either case\nunderflows usb_packet_length to about 65530.\n\nThat bypasses the usb_packet_length \u003c ether_packet_length truncation path.\nThe device-supplied ether_packet_length, a le16 up to 65535 read from\nheader_start[2], then drives a memcmp() and the following skb_trim() and\nskb_pull() past the end of the rx buffer. The rx buffer is hard_mtu * 10,\nwhich is 14000 bytes. That is an out of bounds read.\n\nRequire both the start and end framing headers to be present before\nsubtracting them, on every loop iteration."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:53:56.750Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/391706889a5112feafdc0c68db3ecc7ed325d09c"
},
{
"url": "https://git.kernel.org/stable/c/aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b"
},
{
"url": "https://git.kernel.org/stable/c/2d04c37ed4e1d0f733ad39ec35b5a5d8818b4f4a"
},
{
"url": "https://git.kernel.org/stable/c/46ab32870d010e9a057bc5659cea22b7e728ca88"
},
{
"url": "https://git.kernel.org/stable/c/c466097d85d52f3aa200736cb4759e66d4bbf6e3"
},
{
"url": "https://git.kernel.org/stable/c/e24eb271061db384a3c3ef6f107fe515e68ef222"
},
{
"url": "https://git.kernel.org/stable/c/51e65f1d78457ea4f9513d90ab22c9dccbb35110"
},
{
"url": "https://git.kernel.org/stable/c/47b6bcef6e679593d2e86e04ee72c46a4e2f7139"
}
],
"title": "net: usb: kalmia: bound RX frame length in kalmia_rx_fixup()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64351",
"datePublished": "2026-07-25T08:50:10.882Z",
"dateReserved": "2026-07-19T15:36:31.782Z",
"dateUpdated": "2026-08-17T04:53:56.750Z",
"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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