usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()
In the Linux kernel, the following vulnerability has been resolved: usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup() genelink_rx_fixup() splits an aggregated RX frame into its individual packets, using a per-packet length taken from device-supplied data. That length is only bounded by GL_MAX_PACKET_LEN (1514); it is never compared against how many bytes were actually received. A malicious GeneLink (GL620A) device can therefore send a short URB whose header claims packet_count > 1 and a first packet of up to 1514 bytes. skb_put_data(gl_skb, packet->packet_data, size); then copies past the end of the receive buffer and hands the adjacent slab contents up the network stack, an out-of-bounds read that leaks kernel heap. No privilege is required: the path runs in the usbnet RX softirq as soon as the interface is up. BUG: KASAN: slab-out-of-bounds in genelink_rx_fixup (drivers/net/usb/gl620a.c:112) Read of size 1514 at addr ffff888011309708 by task ksoftirqd/0/14 Call Trace: ... __asan_memcpy (mm/kasan/shadow.c:105) genelink_rx_fixup (include/linux/skbuff.h:2814 drivers/net/usb/gl620a.c:112) usbnet_bh (drivers/net/usb/usbnet.c:572 drivers/net/usb/usbnet.c:1589) process_one_work (kernel/workqueue.c:3322) bh_worker (kernel/workqueue.c:3405) tasklet_action (kernel/softirq.c:965) handle_softirqs (kernel/softirq.c:622) run_ksoftirqd (kernel/softirq.c:1076) ... skb_pull() already verifies that the requested length fits the buffer and returns NULL otherwise. Move it ahead of
CVE-2026-64540
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-2026-64540
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": "47ee3051c856cc2aa95d35d577a8cb37279d540f",
"lessThan": "255d03551f94c7bdd86c7d9181a70b21917d829f",
"versionType": "git"
},
{
"status": "affected",
"version": "47ee3051c856cc2aa95d35d577a8cb37279d540f",
"lessThan": "4359376e6238d89977a35086e47ca3b07f43e850",
"versionType": "git"
},
{
"status": "affected",
"version": "47ee3051c856cc2aa95d35d577a8cb37279d540f",
"lessThan": "8624e179fa3ce23c2fbd1a198ce30764b73f054a",
"versionType": "git"
},
{
"status": "affected",
"version": "47ee3051c856cc2aa95d35d577a8cb37279d540f",
"lessThan": "573418f7ea8f859a841417eb4b915594094fd967",
"versionType": "git"
},
{
"status": "affected",
"version": "47ee3051c856cc2aa95d35d577a8cb37279d540f",
"lessThan": "0575599e451aff3c5329922562374a2cab25fc51",
"versionType": "git"
},
{
"status": "affected",
"version": "47ee3051c856cc2aa95d35d577a8cb37279d540f",
"lessThan": "0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db",
"versionType": "git"
},
{
"status": "affected",
"version": "47ee3051c856cc2aa95d35d577a8cb37279d540f",
"lessThan": "3ef79fa3860e644c8de7834fa7300e1c58f38862",
"versionType": "git"
},
{
"status": "affected",
"version": "47ee3051c856cc2aa95d35d577a8cb37279d540f",
"lessThan": "8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/usb/gl620a.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/usb/gl620a.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64540
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41074 · Revision 1
- Added to Heist Feed
- Publisher date