Answer in brief
CVE-2026-64540 records a High severity (CVSS 8.1) vulnerability in usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=47ee3051c856cc2aa95d35d577a8cb37279d540f <255d03551f94c7bdd86c7d9181a70b21917d829f || >=47ee3051c856cc2aa95d35d577a8cb37279d540f <4359376e6238d89977a35086e47ca3b07f43e850 || >=47ee3051c856cc2aa95d35d577a8cb37279d540f <8624e179fa3ce23c2fbd1a198ce30764b73f054a || >=47ee3051c856cc2aa95d35d577a8cb37279d540f <573418f7ea8f859a841417eb4b915594094fd967 || >=47ee3051c856cc2aa95d35d577a8cb37279d540f <0575599e451aff3c5329922562374a2cab25fc51 || >=47ee3051c856cc2aa95d35d577a8cb37279d540f <0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db || >=47ee3051c856cc2aa95d35d577a8cb37279d540f <3ef79fa3860e644c8de7834fa7300e1c58f38862 || >=47ee3051c856cc2aa95d35d577a8cb37279d540f <8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a | 255d03551f94c7bdd86c7d9181a70b21917d829f, 4359376e6238d89977a35086e47ca3b07f43e850, 8624e179fa3ce23c2fbd1a198ce30764b73f054a, 573418f7ea8f859a841417eb4b915594094fd967, 0575599e451aff3c5329922562374a2cab25fc51, 0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db, 3ef79fa3860e644c8de7834fa7300e1c58f38862, 8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a |
| Linux/Linuxgeneric | 2.6.14 | Not reported |
Published upstream
Jul 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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 the copy and check its result, so a packet that overruns the received data is rejected before it is read. Well-formed frames, whose packets are fully present, are unaffected.
Quoted source text, attributed separately from HOL analysis.