CVE-2026-52982net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
- 9.8CriticalCVSS base score
- 0.54%Exploitation in 30 daysEPSS · top 54% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 15 days later
· 15 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.54% · top 54% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 5af290c86fa81ddbc86a08d54229af5daa40c6a4
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 24831b0b2ada9fef18d1f486b7b7c444ee5ba637
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 423b5b86e14e190f6e3161eb5f2ea5f908295ba7
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 5db090ca07b28a63fb1499690cf19a3f3adafacb
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 30cf9829d09ca958279c937af8e35495cd2f1e09
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 6999d70e0eda39af029fa1891c48f0a8832b09d5
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 4dd7eb94f79486b77ca6b4c8676aedbc465dc802
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 23f0e34c64acba15cad4d23e50f41f533da195fa
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.141 – ≤ 6.6.*
- unaffected 6.12.91 – ≤ 6.12.*
- unaffected 6.18.33 – ≤ 6.18.*
- unaffected 7.0.10 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/5af290c86fa81ddbc86a08d54229af5daa40c6a4 (opens in a new tab)
- https://git.kernel.org/stable/c/24831b0b2ada9fef18d1f486b7b7c444ee5ba637 (opens in a new tab)
- https://git.kernel.org/stable/c/423b5b86e14e190f6e3161eb5f2ea5f908295ba7 (opens in a new tab)
- https://git.kernel.org/stable/c/5db090ca07b28a63fb1499690cf19a3f3adafacb (opens in a new tab)
- https://git.kernel.org/stable/c/30cf9829d09ca958279c937af8e35495cd2f1e09 (opens in a new tab)
- https://git.kernel.org/stable/c/6999d70e0eda39af029fa1891c48f0a8832b09d5 (opens in a new tab)
- https://git.kernel.org/stable/c/4dd7eb94f79486b77ca6b4c8676aedbc465dc802 (opens in a new tab)
- https://git.kernel.org/stable/c/23f0e34c64acba15cad4d23e50f41f533da195fa (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-38850 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-52982)Record last updated .