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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 5af290c86fa81ddbc86a08d54229af5daa40c6a4
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 24831b0b2ada9fef18d1f486b7b7c444ee5ba637
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 423b5b86e14e190f6e3161eb5f2ea5f908295ba7
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 5db090ca07b28a63fb1499690cf19a3f3adafacb
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 30cf9829d09ca958279c937af8e35495cd2f1e09
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 6999d70e0eda39af029fa1891c48f0a8832b09d5
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 4dd7eb94f79486b77ca6b4c8676aedbc465dc802
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 23f0e34c64acba15cad4d23e50f41f533da195fa
Linux Linux affected
Version Status Constraints
2.6.12 affected —
0 unaffected < 2.6.12
5.10.258 unaffected ≤ 5.10.*
5.15.209 unaffected ≤ 5.15.*
6.1.175 unaffected ≤ 6.1.*
6.6.141 unaffected ≤ 6.6.*
6.12.91 unaffected ≤ 6.12.*
6.18.33 unaffected ≤ 6.18.*
7.0.10 unaffected ≤ 7.0.*
7.1 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/23f0e34c64acba15cad4d23e50f41f533da195fa cve-icon
https://git.kernel.org/stable/c/24831b0b2ada9fef18d1f486b7b7c444ee5ba637 cve-icon
https://git.kernel.org/stable/c/30cf9829d09ca958279c937af8e35495cd2f1e09 cve-icon
https://git.kernel.org/stable/c/423b5b86e14e190f6e3161eb5f2ea5f908295ba7 cve-icon
https://git.kernel.org/stable/c/4dd7eb94f79486b77ca6b4c8676aedbc465dc802 cve-icon
https://git.kernel.org/stable/c/5af290c86fa81ddbc86a08d54229af5daa40c6a4 cve-icon
https://git.kernel.org/stable/c/5db090ca07b28a63fb1499690cf19a3f3adafacb cve-icon
https://git.kernel.org/stable/c/6999d70e0eda39af029fa1891c48f0a8832b09d5 cve-icon
History

Wed, 24 Jun 2026 17:15:00 +0000

Type Values Removed Values Added
Description 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.
Title net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-06-24T16:28:57.763Z

Reserved: 2026-06-09T07:44:35.376Z

Link: CVE-2026-52982

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

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