CVE-2026-43015

net: macb: fix clk handling on PCI glue driver removal

HIGH

7.8

CVSS Score

Published: May 1, 2026 at 02:15 PM UTC

Updated: June 17, 2026 at 10:48 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.1%

Description

In the Linux kernel, the following vulnerability has been resolved: net: macb: fix clk handling on PCI glue driver removal platform_device_unregister() may still want to use the registered clks during runtime resume callback. Note that there is a commit d82d5303c4c5 ("net: macb: fix use after free on rmmod") that addressed the similar problem of clk vs platform device unregistration but just moved the bug to another place. Save the pointers to clks into local variables for reuse after platform device is unregistered. BUG: KASAN: use-after-free in clk_prepare+0x5a/0x60 Read of size 8 at addr ffff888104f85e00 by task modprobe/597 CPU: 2 PID: 597 Comm: modprobe Not tainted 6.1.164+ #114 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x8d/0xba print_report+0x17f/0x496 kasan_report+0xd9/0x180 clk_prepare+0x5a/0x60 macb_runtime_resume+0x13d/0x410 [macb] pm_generic_runtime_resume+0x97/0xd0 __rpm_callback+0xc8/0x4d0 rpm_callback+0xf6/0x230 rpm_resume+0xeeb/0x1a70 __pm_runtime_resume+0xb4/0x170 bus_remove_device+0x2e3/0x4b0 device_del+0x5b3/0xdc0 platform_device_del+0x4e/0x280 platform_device_unregister+0x11/0x50 pci_device_remove+0xae/0x210 device_remove+0xcb/0x180 device_release_driver_internal+0x529/0x770 driver_detach+0xd4/0x1a0 bus_remove_driver+0x135/0x260 driver_unregister+0x72/0xb0 pci_unregister_driver+0x26/0x220 __do_sys_delete_module+0x32e/0x550 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 </TASK> Allocated by task 519: kasan_save_stack+0x2c/0x50 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x8e/0x90 __clk_register+0x458/0x2890 clk_hw_register+0x1a/0x60 __clk_hw_register_fixed_rate+0x255/0x410 clk_register_fixed_rate+0x3c/0xa0 macb_probe+0x1d8/0x42e [macb_pci] local_pci_probe+0xd7/0x190 pci_device_probe+0x252/0x600 really_probe+0x255/0x7f0 __driver_probe_device+0x1ee/0x330 driver_probe_device+0x4c/0x1f0 __driver_attach+0x1df/0x4e0 bus_for_each_dev+0x15d/0x1f0 bus_add_driver+0x486/0x5e0 driver_register+0x23a/0x3d0 do_one_initcall+0xfd/0x4d0 do_init_module+0x18b/0x5a0 load_module+0x5663/0x7950 __do_sys_finit_module+0x101/0x180 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Freed by task 597: kasan_save_stack+0x2c/0x50 kasan_set_track+0x21/0x30 kasan_save_free_info+0x2a/0x50 __kasan_slab_free+0x106/0x180 __kmem_cache_free+0xbc/0x320 clk_unregister+0x6de/0x8d0 macb_remove+0x73/0xc0 [macb_pci] pci_device_remove+0xae/0x210 device_remove+0xcb/0x180 device_release_driver_internal+0x529/0x770 driver_detach+0xd4/0x1a0 bus_remove_driver+0x135/0x260 driver_unregister+0x72/0xb0 pci_unregister_driver+0x26/0x220 __do_sys_delete_module+0x32e/0x550 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v ≥ 4.14.249v ≥ 4.19.209v ≥ 5.14.9v ≥ 5.4.1504.14.249 ≤ v < 4.154.19.209 ≤ v < 4.205.10.70 ≤ v < 5.10.2535.14.9 ≤ v < 5.155.15 ≤ v < 5.15.2035.15 ≤ v < 6.1.1685.15 ≤ v < 6.12.815.15 ≤ v < 6.18.225.15 ≤ v < 6.19.125.15 ≤ v < 6.6.1345.15 ≤ v < 7.05.15.1 ≤ v < 5.15.2035.16 ≤ v < 6.1.1685.4.150 ≤ v < 5.56.13 ≤ v < 6.18.226.19 ≤ v < 6.19.126.2 ≤ v < 6.6.1346.7 ≤ v < 6.12.811da750d1e2140ef43d64d17f301ff6f41b45541e4.14.249 4.19.20946670fb832ee80943715df618632ca13c2e96f2b4ad6f2d23b0f6ac0d3e5f3102a4256d1c86c90f55.10.70 5.14.9 5.15 5.15 rc2 5.15 rc3 5.15 rc4 5.15 rc5 5.15 rc6 5.15 rc7 5.4.150 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc67721221e87d25c9840d9ca6b986dbdc410d5ce2ba7d521cc726f30b8e679a6f36d04b18a8ab3c536d82d5303c4c539db86588ffb5dc5b26c3f1513e8

Vendor states this is fixed in 16ab4c0e2b15df5d33bfcb9ea8e4441b85dd4a57 (fixed)

Vendor states this is fixed in 2d96204e4184d6f7dd2f93c6f218fd0c1f55e9ae (fixed)

Vendor states this is fixed in 3496fb9e66f79d4def3bb7ec7563e3eaa33a688f (fixed)

Vendor states this is fixed in 67f70841a175fa3469119f52d77a3662c07507a2 (fixed)

Vendor states this is fixed in b3f799cdf830df1782ae463cf15ace35015be99e (fixed)

Vendor states this is fixed in bf64cae913cdd4821f13d5d1d68900c0891bef69 (fixed)

Vendor states this is fixed in ce8fe5287b87e24e225c342f3b0ec04f0b3680fe (fixed)

Vendor states this is fixed in f310a836da90d0f0321b14d446c071af63f9ee4c (fixed)

Affected range stops below 4.15, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.20, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 5.10.253 (unaffected)

Vendor states this is fixed in 5.15 (unaffected)