CVE-2026-52982

Katalog CVE

CVSS 9.8 · Critical EPSS 0,73%

Kerentanan Use After Free pada linux kernel. Skor CVSS 3.1 9.8 (Critical) menurut CNA.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

24 Juni 2026

Terakhir diubah

14 Juli 2026

Status NVD

Analyzed

CVSS 3.1

9.8 (Critical), sumber CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-416: Use After Free

EPSS (30 hari)

0,73% peluang dieksploitasi; lebih tinggi dari 53,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/23f0e34c64acba15cad4d23e50f41f533da195fa patch
• https://git.kernel.org/stable/c/24831b0b2ada9fef18d1f486b7b7c444ee5ba637 patch
• https://git.kernel.org/stable/c/30cf9829d09ca958279c937af8e35495cd2f1e09 patch
• https://git.kernel.org/stable/c/423b5b86e14e190f6e3161eb5f2ea5f908295ba7 patch
• https://git.kernel.org/stable/c/4dd7eb94f79486b77ca6b4c8676aedbc465dc802 patch
• https://git.kernel.org/stable/c/5af290c86fa81ddbc86a08d54229af5daa40c6a4 patch
• https://git.kernel.org/stable/c/5db090ca07b28a63fb1499690cf19a3f3adafacb patch
• https://git.kernel.org/stable/c/6999d70e0eda39af029fa1891c48f0a8832b09d5 patch