CVE-2026-64540

CVE CVE-2026-64540EUVD EUVD-2026-49591Published 2026-07-27T20:10:33.000ZLast changed 2026-08-05T12:42:48.000ZCVSS 8.1

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux patch: 5.15.212; patch: 6.18.40; patch: 7.1.5; patch: 0; patch: 7.2-rc2; patch: 6.1.178; 47ee3051c856cc2aa95d35d577a8cb37279d540f <4359376e6238d89977a35086e47ca3b07f43e850; 2.6.14; patch: 6.6.145; 47ee3051c856cc2aa95d35d577a8cb37279d540f <573418f7ea8f859a841417eb4b915594094fd967; 47ee3051c856cc2aa95d35d577a8cb37279d540f <255d03551f94c7bdd86c7d9181a70b21917d829f; 47ee3051c856cc2aa95d35d577a8cb37279d540f <8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a; 47ee3051c856cc2aa95d35d577a8cb37279d540f <0575599e451aff3c5329922562374a2cab25fc51; patch: 5.10.261; 47ee3051c856cc2aa95d35d577a8cb37279d540f <0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db; 47ee3051c856cc2aa95d35d577a8cb37279d540f <8624e179fa3ce23c2fbd1a198ce30764b73f054a; 47ee3051c856cc2aa95d35d577a8cb37279d540f <3ef79fa3860e644c8de7834fa7300e1c58f38862; patch: 6.12.97

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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