Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: disable napi on driver removal A warning on driver removal started occurring after commit 9dd05df8403b ("net: warn if NAPI instance wasn't shut down"). Disable tx napi before deleting it in mt76_dma_cleanup(). WARNING: CPU: 4 PID: 18828 at net/core/dev.c:7288 __netif_napi_del_locked+0xf0/0x100 CPU: 4 UID: 0 PID: 18828 Comm: modprobe Not tainted 6.15.0-rc4 #4 PREEMPT(lazy) Hardware name: ASUS System Product Name/PRIME X670E-PRO WIFI, BIOS 3035 09/05/2024 RIP: 0010:__netif_napi_del_locked+0xf0/0x100 Call Trace: <TASK> mt76_dma_cleanup+0x54/0x2f0 [mt76] mt7921_pci_remove+0xd5/0x190 [mt7921e] pci_device_remove+0x47/0xc0 device_release_driver_internal+0x19e/0x200 driver_detach+0x48/0x90 bus_remove_driver+0x6d/0xf0 pci_unregister_driver+0x2e/0xb0 __do_sys_delete_module.isra.0+0x197/0x2e0 do_syscall_64+0x7b/0x160 entry_SYSCALL_64_after_hwframe+0x76/0x7e Tested with mt7921e but the same pattern can be actually applied to other mt76 drivers calling mt76_dma_cleanup() during removal. Tx napi is enabled in their *_dma_init() functions and only toggled off and on again inside their suspend/resume/reset paths. So it should be okay to disable tx napi in such a generic way. Found by Linux Verification Center (linuxtesting.org).
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
2ac515a5d74f26963362d5da9589c67ca3663338 to < ff0f820fa5b99035b3c654dd531226d8d83aec5faffected2ac515a5d74f26963362d5da9589c67ca3663338 to < ca5b213bf4b4224335a8131a26805d16503fca5faffected2ac515a5d74f26963362d5da9589c67ca3663338 to < b892e830d1ea8c5475254b98827771f7366f1039affected2ac515a5d74f26963362d5da9589c67ca3663338 to < 5e700b06b970fc19e3a1ecb244e14785f3fbb8e3affected2ac515a5d74f26963362d5da9589c67ca3663338 to < 2b81e76db3667d1f7f2ad44e9835cdaf8dea95a8affected2ac515a5d74f26963362d5da9589c67ca3663338 to < e7bfbda5fddd27f3158e723d641c0fcdfb0552a7affected2ac515a5d74f26963362d5da9589c67ca3663338 to < 78ab4be549533432d97ea8989d2f00b508fa68d8affected
Linux Linux
Default version status: affected
5.2affected0 to < 5.2unaffected5.10.238 to ≤ 5.10.*unaffected5.15.184 to ≤ 5.15.*unaffected6.1.140 to ≤ 6.1.*unaffected6.6.92 to ≤ 6.6.*unaffected6.12.30 to ≤ 6.12.*unaffected6.14.8 to ≤ 6.14.*unaffected6.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ff0f820fa5b99035b3c654dd531226d8d83aec5f ↗
- https://git.kernel.org/stable/c/ca5b213bf4b4224335a8131a26805d16503fca5f ↗
- https://git.kernel.org/stable/c/b892e830d1ea8c5475254b98827771f7366f1039 ↗
- https://git.kernel.org/stable/c/5e700b06b970fc19e3a1ecb244e14785f3fbb8e3 ↗
- https://git.kernel.org/stable/c/2b81e76db3667d1f7f2ad44e9835cdaf8dea95a8 ↗
- https://git.kernel.org/stable/c/e7bfbda5fddd27f3158e723d641c0fcdfb0552a7 ↗
- https://git.kernel.org/stable/c/78ab4be549533432d97ea8989d2f00b508fa68d8 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗
- https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html ↗