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CVE-2026-64540

usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 47ee3051c856cc2aa95d35d577a8cb37279d540f · fixed in 255d03551f94c7bdd86c7d9181a70b21917d829f; From 47ee3051c856cc2aa95d35d577a8cb37279d540f · fixed in 4359376e6238d89977a35086e47ca3b07f43e850; From 47ee3051c856cc2aa95d35d577a8cb37279d540f · fixed in 8624e179fa3ce23c2fbd1a198ce30764b73f054a; From 47ee3051c856cc2aa95d35d577a8cb37279d540f · fixed in 573418f7ea8f859a841417eb4b915594094fd967; From 47ee3051c856cc2aa95d35d577a8cb37279d540f · fixed in 0575599e451aff3c5329922562374a2cab25fc51; From 47ee3051c856cc2aa95d35d577a8cb37279d540f · fixed in 0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db; From 47ee3051c856cc2aa95d35d577a8cb37279d540f · fixed in 3ef79fa3860e644c8de7834fa7300e1c58f38862; From 47ee3051c856cc2aa95d35d577a8cb37279d540f · fixed in 8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a

  • Linux Linux

    2.6.14

  • KernelLinux

    From 2.6.14 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org