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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64540
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-27 21:17:06 UTC
Updated2026-07-30 06:25:57 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.002770000 probability, percentile 0.199910000 (date 2026-08-01)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 47ee3051c856cc2aa95d35d577a8cb37279d540f 255d03551f94c7bdd86c7d9181a70b21917d829f git Not specified
CNA Linux Linux affected 47ee3051c856cc2aa95d35d577a8cb37279d540f 4359376e6238d89977a35086e47ca3b07f43e850 git Not specified
CNA Linux Linux affected 47ee3051c856cc2aa95d35d577a8cb37279d540f 8624e179fa3ce23c2fbd1a198ce30764b73f054a git Not specified
CNA Linux Linux affected 47ee3051c856cc2aa95d35d577a8cb37279d540f 573418f7ea8f859a841417eb4b915594094fd967 git Not specified
CNA Linux Linux affected 47ee3051c856cc2aa95d35d577a8cb37279d540f 0575599e451aff3c5329922562374a2cab25fc51 git Not specified
CNA Linux Linux affected 47ee3051c856cc2aa95d35d577a8cb37279d540f 0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db git Not specified
CNA Linux Linux affected 47ee3051c856cc2aa95d35d577a8cb37279d540f 3ef79fa3860e644c8de7834fa7300e1c58f38862 git Not specified
CNA Linux Linux affected 47ee3051c856cc2aa95d35d577a8cb37279d540f 8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a git Not specified
CNA Linux Linux affected 2.6.14 Not specified
CNA Linux Linux unaffected 2.6.14 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4359376e6238d89977a35086e47ca3b07f43e850 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0575599e451aff3c5329922562374a2cab25fc51 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/573418f7ea8f859a841417eb4b915594094fd967 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8624e179fa3ce23c2fbd1a198ce30764b73f054a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/255d03551f94c7bdd86c7d9181a70b21917d829f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3ef79fa3860e644c8de7834fa7300e1c58f38862 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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