CVE-2025-40164usbnet: Fix using smp_processor_id() in preemptible code warnings
- 5.5MediumCVSS base score
- 0.19%Exploitation in 30 daysEPSS · top 91% 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: usbnet: Fix using smp_processor_id() in preemptible code warnings Syzbot reported the following warning: BUG: using smp_processor_id() in preemptible [00000000] code: dhcpcd/2879 caller is usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331 CPU: 1 UID: 0 PID: 2879 Comm: dhcpcd Not tainted 6.15.0-rc4-syzkaller-00098-g615dca38c2ea #0 PREEMPT(voluntary) Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 check_preemption_disabled+0xd0/0xe0 lib/smp_processor_id.c:49 usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331 usbnet_resume_rx+0x4b/0x170 drivers/net/usb/usbnet.c:708 usbnet_change_mtu+0x1be/0x220 drivers/net/usb/usbnet.c:417 __dev_set_mtu net/core/dev.c:9443 [inline] netif_set_mtu_ext+0x369/0x5c0 net/core/dev.c:9496 netif_set_mtu+0xb0/0x160 net/core/dev.c:9520 dev_set_mtu+0xae/0x170 net/core/dev_api.c:247 dev_ifsioc+0xa31/0x18d0 net/core/dev_ioctl.c:572 dev_ioctl+0x223/0x10e0 net/core/dev_ioctl.c:821 sock_do_ioctl+0x19d/0x280 net/socket.c:1204 sock_ioctl+0x42f/0x6a0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f For historical and portability reasons, the netif_rx() is usually run in the softirq or interrupt context, this commit therefore add local_bh_disable/enable() protection in the usbnet_resume_rx().
Timeline
ID reserved
By Linux
- 7 months later
· 7 months later
Published
- 7 months later
· 7 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 |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 43daa96b166c3cf5ff30dfac0c5efa2620e4beab – < 6635e52bc4165793aefd686962d912d73d323afe
- affected 43daa96b166c3cf5ff30dfac0c5efa2620e4beab – < 65d04291adf7c59338f87aab9c6fe0bfa9993e64
- affected 43daa96b166c3cf5ff30dfac0c5efa2620e4beab – < f45fffae5e2549bd0a4670cc52a15ad54c9f121e
- affected 43daa96b166c3cf5ff30dfac0c5efa2620e4beab – < 17fbad93879e87a334062882b45fa727ba1b3dd7
- affected 43daa96b166c3cf5ff30dfac0c5efa2620e4beab – < d1944bab8e0c1511f0cbf364aa06547735bb0ddb
- affected 43daa96b166c3cf5ff30dfac0c5efa2620e4beab – < 0134c7bff14bd50314a4f92b182850ddfc38e255
- affected 43daa96b166c3cf5ff30dfac0c5efa2620e4beab – < 327cd4b68b4398b6c24f10eb2b2533ffbfc10185
- affected 4.7
- unaffected < 4.7
- unaffected 5.10.259 – ≤ 5.10.*
- unaffected 5.15.199 – ≤ 5.15.*
- unaffected 6.1.162 – ≤ 6.1.*
- unaffected 6.6.122 – ≤ 6.6.*
- unaffected 6.12.64 – ≤ 6.12.*
- unaffected 6.17.5 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References7
- https://git.kernel.org/stable/c/6635e52bc4165793aefd686962d912d73d323afe (opens in a new tab)
- https://git.kernel.org/stable/c/65d04291adf7c59338f87aab9c6fe0bfa9993e64 (opens in a new tab)
- https://git.kernel.org/stable/c/f45fffae5e2549bd0a4670cc52a15ad54c9f121e (opens in a new tab)
- https://git.kernel.org/stable/c/17fbad93879e87a334062882b45fa727ba1b3dd7 (opens in a new tab)
- https://git.kernel.org/stable/c/d1944bab8e0c1511f0cbf364aa06547735bb0ddb (opens in a new tab)
- https://git.kernel.org/stable/c/0134c7bff14bd50314a4f92b182850ddfc38e255 (opens in a new tab)
- https://git.kernel.org/stable/c/327cd4b68b4398b6c24f10eb2b2533ffbfc10185 (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-2025-124919 (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-2025-40164)Record last updated .