CVE-2026-64540 Affecting kernel-syms package, versions <6.4.0-150700.53.81.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-SLES157-KERNELSYMS-19912080
- published18 Sept 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-64540 (opens in a new tab)How to fix?
Upgrade SLES:15.7 kernel-syms to version 6.4.0-150700.53.81.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-syms package and not the kernel-syms package as distributed by SLES.
See How to fix? for SLES:15.7 relevant fixed versions and status.
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.
References
- https://www.suse.com/security/cve/CVE-2026-64540.html
- https://bugzilla.suse.com/1273302
- https://git.kernel.org/stable/c/0575599e451aff3c5329922562374a2cab25fc51
- https://git.kernel.org/stable/c/0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db
- https://git.kernel.org/stable/c/255d03551f94c7bdd86c7d9181a70b21917d829f
- https://git.kernel.org/stable/c/3ef79fa3860e644c8de7834fa7300e1c58f38862
- https://git.kernel.org/stable/c/4359376e6238d89977a35086e47ca3b07f43e850
- https://git.kernel.org/stable/c/573418f7ea8f859a841417eb4b915594094fd967
- https://git.kernel.org/stable/c/8624e179fa3ce23c2fbd1a198ce30764b73f054a
- https://git.kernel.org/stable/c/8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a