CVE-2025-40164: linux
Vulnerability summary
CVE-2025-40164 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 50 · Related 48Timeline
- 12-11-2025PublishedVulnerability first disclosed.
- 19-06-2026Last modifiedVulnerability information updated.
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().
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.19%
Chance of exploitation in the next 30 days
Percentile
9%
Versus all other CVEs
30-day change
+0.01 pp
From 0.18% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu152 products
- linuxAll versions (No fix recorded) | < 5.15.0-176.186 | < 6.8.0-110.110 | < 6.17.0-14.14
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1105.112 | < 6.8.0-1052.55 | < 6.17.0-1007.7
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 43daa96b166c3cf5ff30dfac0c5efa2620e4beab, < 6635e52bc4165793aefd686962d912d73d323afe | ≥ 43daa96b166c3cf5ff30dfac0c5efa2620e4beab, < 65d04291adf7c59338f87aab9c6fe0bfa9993e64 | ≥ 43daa96b166c3cf5ff30dfac0c5efa2620e4beab, < f45fffae5e2549bd0a4670cc52a15ad54c9f121e | ≥ 43daa96b166c3cf5ff30dfac0c5efa2620e4beab, < 17fbad93879e87a334062882b45fa727ba1b3dd7 | ≥ 43daa96b166c3cf5ff30dfac0c5efa2620e4beab, < d1944bab8e0c1511f0cbf364aa06547735bb0ddb | ≥ 43daa96b166c3cf5ff30dfac0c5efa2620e4beab, < 0134c7bff14bd50314a4f92b182850ddfc38e255 | ≥ 43daa96b166c3cf5ff30dfac0c5efa2620e4beab, < 327cd4b68b4398b6c24f10eb2b2533ffbfc10185 | 4.7
- linux_kernel≥ 4.7.1, < 5.15.199 | ≥ 5.16, < 6.1.162 | ≥ 6.2, < 6.6.122 | ≥ 6.7, < 6.12.64 | ≥ 6.13, < 6.17.5 | 4.7 | 4.7:rc7 | 6.18:rc1
Debian1 product
- linux< 6.1.162-1 | < 6.12.69-1 | < 6.17.6-1
3 vendors · 155 products
