In the Linux kernel, the following vulnerability has been resolved:
net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
syzbot reported a KASAN slab-use-after-free read in rtl8150_start_xmit()
when accessing skb->len for tx statistics after usb_submit_urb() has
been called:
BUG: KASAN: slab-use-after-free in rtl8150_start_xmit+0x71f/0x760
drivers/net/usb/rtl8150.c:712
Read of size 4 at addr ffff88810eb7a930 by task kworker/0:4/5226
The URB completion handler write_bulk_callback() frees the skb via
dev_kfree_skb_irq(dev->tx_skb). The URB may complete on another CPU
in softirq context before usb_submit_urb() returns in the submitter,
so by the time the submitter reads skb->len the skb has already been
queued to the per-CPU completion_queue and freed by net_tx_action():
CPU A (xmit) CPU B (USB completion softirq)
------------ ------------------------------
dev->tx_skb = skb;
usb_submit_urb() --+
|-------> write_bulk_callback()
| dev_kfree_skb_irq(dev->tx_skb)
| net_tx_action()
| napi_skb_cache_put() <-- free
netdev->stats.tx_bytes |
+= skb->len; <-- UAF read
Fix it by caching skb->len before submitting the URB and using the
cached value when updating the tx_bytes counter.
The pre-existing tx_bytes semantics are preserved: the counter tracks
the original frame length (skb->len), not the ETH_ZLEN/USB-alignment
padded "count" value that is handed to the device. Changing that
would be a user-visible accounting change and is out of scope for
this UAF fix.
References
Configurations
Configuration 1 (hide)
|
History
14 Jul 2026, 16:49
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/23f0e34c64acba15cad4d23e50f41f533da195fa - Patch | |
| References | () https://git.kernel.org/stable/c/24831b0b2ada9fef18d1f486b7b7c444ee5ba637 - Patch | |
| References | () https://git.kernel.org/stable/c/30cf9829d09ca958279c937af8e35495cd2f1e09 - Patch | |
| References | () https://git.kernel.org/stable/c/423b5b86e14e190f6e3161eb5f2ea5f908295ba7 - Patch | |
| References | () https://git.kernel.org/stable/c/4dd7eb94f79486b77ca6b4c8676aedbc465dc802 - Patch | |
| References | () https://git.kernel.org/stable/c/5af290c86fa81ddbc86a08d54229af5daa40c6a4 - Patch | |
| References | () https://git.kernel.org/stable/c/5db090ca07b28a63fb1499690cf19a3f3adafacb - Patch | |
| References | () https://git.kernel.org/stable/c/6999d70e0eda39af029fa1891c48f0a8832b09d5 - Patch | |
| CWE | CWE-416 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* |
|
| First Time |
Linux linux Kernel
Linux |
28 Jun 2026, 08:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 9.8 |
24 Jun 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-06-24 17:17
Updated : 2026-07-14 16:49
NVD link : CVE-2026-52982
Mitre link : CVE-2026-52982
CVE.ORG link : CVE-2026-52982
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free