CVE-2024-26895 (GCVE-0-2024-26895)
Vulnerability from cvelistv5
Published
2024-04-17 10:27
Modified
2026-08-05 11:28
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: wilc1000: prevent use-after-free on vif when cleaning up all interfaces wilc_netdev_cleanup currently triggers a KASAN warning, which can be observed on interface registration error path, or simply by removing the module/unbinding device from driver: echo spi0.1 > /sys/bus/spi/drivers/wilc1000_spi/unbind ================================================================== BUG: KASAN: slab-use-after-free in wilc_netdev_cleanup+0x508/0x5cc Read of size 4 at addr c54d1ce8 by task sh/86 CPU: 0 PID: 86 Comm: sh Not tainted 6.8.0-rc1+ #117 Hardware name: Atmel SAMA5 unwind_backtrace from show_stack+0x18/0x1c show_stack from dump_stack_lvl+0x34/0x58 dump_stack_lvl from print_report+0x154/0x500 print_report from kasan_report+0xac/0xd8 kasan_report from wilc_netdev_cleanup+0x508/0x5cc wilc_netdev_cleanup from wilc_bus_remove+0xc8/0xec wilc_bus_remove from spi_remove+0x8c/0xac spi_remove from device_release_driver_internal+0x434/0x5f8 device_release_driver_internal from unbind_store+0xbc/0x108 unbind_store from kernfs_fop_write_iter+0x398/0x584 kernfs_fop_write_iter from vfs_write+0x728/0xf88 vfs_write from ksys_write+0x110/0x1e4 ksys_write from ret_fast_syscall+0x0/0x1c [...] Allocated by task 1: kasan_save_track+0x30/0x5c __kasan_kmalloc+0x8c/0x94 __kmalloc_node+0x1cc/0x3e4 kvmalloc_node+0x48/0x180 alloc_netdev_mqs+0x68/0x11dc alloc_etherdev_mqs+0x28/0x34 wilc_netdev_ifc_init+0x34/0x8ec wilc_cfg80211_init+0x690/0x910 wilc_bus_probe+0xe0/0x4a0 spi_probe+0x158/0x1b0 really_probe+0x270/0xdf4 __driver_probe_device+0x1dc/0x580 driver_probe_device+0x60/0x140 __driver_attach+0x228/0x5d4 bus_for_each_dev+0x13c/0x1a8 bus_add_driver+0x2a0/0x608 driver_register+0x24c/0x578 do_one_initcall+0x180/0x310 kernel_init_freeable+0x424/0x484 kernel_init+0x20/0x148 ret_from_fork+0x14/0x28 Freed by task 86: kasan_save_track+0x30/0x5c kasan_save_free_info+0x38/0x58 __kasan_slab_free+0xe4/0x140 kfree+0xb0/0x238 device_release+0xc0/0x2a8 kobject_put+0x1d4/0x46c netdev_run_todo+0x8fc/0x11d0 wilc_netdev_cleanup+0x1e4/0x5cc wilc_bus_remove+0xc8/0xec spi_remove+0x8c/0xac device_release_driver_internal+0x434/0x5f8 unbind_store+0xbc/0x108 kernfs_fop_write_iter+0x398/0x584 vfs_write+0x728/0xf88 ksys_write+0x110/0x1e4 ret_fast_syscall+0x0/0x1c [...] David Mosberger-Tan initial investigation [1] showed that this use-after-free is due to netdevice unregistration during vif list traversal. When unregistering a net device, since the needs_free_netdev has been set to true during registration, the netdevice object is also freed, and as a consequence, the corresponding vif object too, since it is attached to it as private netdevice data. The next occurrence of the loop then tries to access freed vif pointer to the list to move forward in the list. Fix this use-after-free thanks to two mechanisms: - navigate in the list with list_for_each_entry_safe, which allows to safely modify the list as we go through each element. For each element, remove it from the list with list_del_rcu - make sure to wait for RCU grace period end after each vif removal to make sure it is safe to free the corresponding vif too (through unregister_netdev) Since we are in a RCU "modifier" path (not a "reader" path), and because such path is expected not to be concurrent to any other modifier (we are using the vif_mutex lock), we do not need to use RCU list API, that's why we can benefit from list_for_each_entry_safe. [1] https://lore.kernel.org/linux-wireless/ab077dbe58b1ea5de0a3b2ca21f275a07af967d2.camel@egauge.net/
References
Impacted products
Vendor Product Version
Linux Linux Version: 8399918f3056e1033f0f4c08eab437fb38d6f22d
Version: 8399918f3056e1033f0f4c08eab437fb38d6f22d
Version: 8399918f3056e1033f0f4c08eab437fb38d6f22d
Version: 8399918f3056e1033f0f4c08eab437fb38d6f22d
Version: 8399918f3056e1033f0f4c08eab437fb38d6f22d
Version: 8399918f3056e1033f0f4c08eab437fb38d6f22d
Version: 8399918f3056e1033f0f4c08eab437fb38d6f22d
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wilc1000: prevent use-after-free on vif when cleaning up all interfaces\n\nwilc_netdev_cleanup currently triggers a KASAN warning, which can be\nobserved on interface registration error path, or simply by\nremoving the module/unbinding device from driver:\n\necho spi0.1 \u003e /sys/bus/spi/drivers/wilc1000_spi/unbind\n\n==================================================================\nBUG: KASAN: slab-use-after-free in wilc_netdev_cleanup+0x508/0x5cc\nRead of size 4 at addr c54d1ce8 by task sh/86\n\nCPU: 0 PID: 86 Comm: sh Not tainted 6.8.0-rc1+ #117\nHardware name: Atmel SAMA5\n unwind_backtrace from show_stack+0x18/0x1c\n show_stack from dump_stack_lvl+0x34/0x58\n dump_stack_lvl from print_report+0x154/0x500\n print_report from kasan_report+0xac/0xd8\n kasan_report from wilc_netdev_cleanup+0x508/0x5cc\n wilc_netdev_cleanup from wilc_bus_remove+0xc8/0xec\n wilc_bus_remove from spi_remove+0x8c/0xac\n spi_remove from device_release_driver_internal+0x434/0x5f8\n device_release_driver_internal from unbind_store+0xbc/0x108\n unbind_store from kernfs_fop_write_iter+0x398/0x584\n kernfs_fop_write_iter from vfs_write+0x728/0xf88\n vfs_write from ksys_write+0x110/0x1e4\n ksys_write from ret_fast_syscall+0x0/0x1c\n\n[...]\n\nAllocated by task 1:\n kasan_save_track+0x30/0x5c\n __kasan_kmalloc+0x8c/0x94\n __kmalloc_node+0x1cc/0x3e4\n kvmalloc_node+0x48/0x180\n alloc_netdev_mqs+0x68/0x11dc\n alloc_etherdev_mqs+0x28/0x34\n wilc_netdev_ifc_init+0x34/0x8ec\n wilc_cfg80211_init+0x690/0x910\n wilc_bus_probe+0xe0/0x4a0\n spi_probe+0x158/0x1b0\n really_probe+0x270/0xdf4\n __driver_probe_device+0x1dc/0x580\n driver_probe_device+0x60/0x140\n __driver_attach+0x228/0x5d4\n bus_for_each_dev+0x13c/0x1a8\n bus_add_driver+0x2a0/0x608\n driver_register+0x24c/0x578\n do_one_initcall+0x180/0x310\n kernel_init_freeable+0x424/0x484\n kernel_init+0x20/0x148\n ret_from_fork+0x14/0x28\n\nFreed by task 86:\n kasan_save_track+0x30/0x5c\n kasan_save_free_info+0x38/0x58\n __kasan_slab_free+0xe4/0x140\n kfree+0xb0/0x238\n device_release+0xc0/0x2a8\n kobject_put+0x1d4/0x46c\n netdev_run_todo+0x8fc/0x11d0\n wilc_netdev_cleanup+0x1e4/0x5cc\n wilc_bus_remove+0xc8/0xec\n spi_remove+0x8c/0xac\n device_release_driver_internal+0x434/0x5f8\n unbind_store+0xbc/0x108\n kernfs_fop_write_iter+0x398/0x584\n vfs_write+0x728/0xf88\n ksys_write+0x110/0x1e4\n ret_fast_syscall+0x0/0x1c\n [...]\n\nDavid Mosberger-Tan initial investigation [1] showed that this\nuse-after-free is due to netdevice unregistration during vif list\ntraversal. When unregistering a net device, since the needs_free_netdev has\nbeen set to true during registration, the netdevice object is also freed,\nand as a consequence, the corresponding vif object too, since it is\nattached to it as private netdevice data. The next occurrence of the loop\nthen tries to access freed vif pointer to the list to move forward in the\nlist.\n\nFix this use-after-free thanks to two mechanisms:\n- navigate in the list with list_for_each_entry_safe, which allows to\n  safely modify the list as we go through each element. For each element,\n  remove it from the list with list_del_rcu\n- make sure to wait for RCU grace period end after each vif removal to make\n  sure it is safe to free the corresponding vif too (through\n  unregister_netdev)\n\nSince we are in a RCU \"modifier\" path (not a \"reader\" path), and because\nsuch path is expected not to be concurrent to any other modifier (we are\nusing the vif_mutex lock), we do not need to use RCU list API, that\u0027s why\nwe can benefit from list_for_each_entry_safe.\n\n[1] https://lore.kernel.org/linux-wireless/ab077dbe58b1ea5de0a3b2ca21f275a07af967d2.camel@egauge.net/"
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              "value": "AV:L - The vulnerable `wilc_netdev_cleanup()` is reached only through local operations \u2014 a sysfs driver unbind write (`unbind_store` \u2192 `spi_remove`/`sdio_remove`), module unload, or bus device removal \u2014 with no network or adjacent-network path to the trigger itself.\nAC:L - The use-after-free is deterministic, not a race: the loop unconditionally dereferences `vif-\u003elist.next` from the object freed by `unregister_netdev()` on the very first iteration, and the second loop unconditionally unlinks through freed memory. It reproduces on every teardown.\nPR:L - The teardown is initiated from an ordinary local context, and the unprivileged attacker supplies the decisive half of the exploit \u2014 grooming the kvmalloc\u0027d netdev slab so the `list_del_rcu()` unlink writes attacker-chosen pointers. Consistent with kernel-CNA scoring of driver-removal UAFs and the higher-severity tiebreak, PR:L.\nUI:N - No victim action is needed; the cleanup path executes and corrupts memory entirely on the attacker\u0027s own request, with no interaction from any other user.\nS:U - Impact is confined to the kernel\u0027s own security authority \u2014 standard in-kernel memory corruption and privilege escalation, with no crossing into a hypervisor, IOMMU, or other separate authority.\nC:H - The freed `wilc_vif`/netdev object is read back after release, and once the slab is reused the attacker controls the pointers followed by `list_first_or_null_rcu()` and `list_del_rcu()`, yielding a read primitive over kernel memory.\nI:H - `list_del_rcu()` on the dangling entry performs `prev-\u003enext = next` with both pointers sourced from freed, reallocatable memory \u2014 a controlled-unlink arbitrary write suitable for control-flow hijacking.\nA:H - Even unexploited, the dangling dereference and poisoned-pointer unlink reliably corrupt the netdev list and oops/panic the kernel, as demonstrated by the KASAN slab-use-after-free report in the fix commit."
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5956f4203b6cdd0755bbdd21b45f3933c7026208\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/fe20e3d56bc911408fc3c27a17c59e9d7885f7d1\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/a9545af2a533739ffb64d6c9a6fec6f13e2b505f\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/3da9d32b7f4a1a9f7e4bb15bb82f2b2dd6719447\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/24228dcf1d30c2231caa332be7d3090ac59fbfe9\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/73a2aa0aef86c2c07be5a2f42c9e6047e1a2f7bb\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/cb5942b77c05d54310a0420cac12935e9b6aa21c\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T00:21:05.707Z\"}}, {\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-05-12T11:50:14.419Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26895\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:48:12.761255Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:16.495Z\"}}], \"cna\": {\"title\": \"wifi: wilc1000: prevent use-after-free on vif when cleaning up all interfaces\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerable `wilc_netdev_cleanup()` is reached only through local operations \\u2014 a sysfs driver unbind write (`unbind_store` \\u2192 `spi_remove`/`sdio_remove`), module unload, or bus device removal \\u2014 with no network or adjacent-network path to the trigger itself.\\nAC:L - The use-after-free is deterministic, not a race: the loop unconditionally dereferences `vif-\u003elist.next` from the object freed by `unregister_netdev()` on the very first iteration, and the second loop unconditionally unlinks through freed memory. It reproduces on every teardown.\\nPR:L - The teardown is initiated from an ordinary local context, and the unprivileged attacker supplies the decisive half of the exploit \\u2014 grooming the kvmalloc\u0027d netdev slab so the `list_del_rcu()` unlink writes attacker-chosen pointers. Consistent with kernel-CNA scoring of driver-removal UAFs and the higher-severity tiebreak, PR:L.\\nUI:N - No victim action is needed; the cleanup path executes and corrupts memory entirely on the attacker\u0027s own request, with no interaction from any other user.\\nS:U - Impact is confined to the kernel\u0027s own security authority \\u2014 standard in-kernel memory corruption and privilege escalation, with no crossing into a hypervisor, IOMMU, or other separate authority.\\nC:H - The freed `wilc_vif`/netdev object is read back after release, and once the slab is reused the attacker controls the pointers followed by `list_first_or_null_rcu()` and `list_del_rcu()`, yielding a read primitive over kernel memory.\\nI:H - `list_del_rcu()` on the dangling entry performs `prev-\u003enext = next` with both pointers sourced from freed, reallocatable memory \\u2014 a controlled-unlink arbitrary write suitable for control-flow hijacking.\\nA:H - Even unexploited, the dangling dereference and poisoned-pointer unlink reliably corrupt the netdev list and oops/panic the kernel, as demonstrated by the KASAN slab-use-after-free report in the fix commit.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"8399918f3056e1033f0f4c08eab437fb38d6f22d\", \"lessThan\": \"5956f4203b6cdd0755bbdd21b45f3933c7026208\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8399918f3056e1033f0f4c08eab437fb38d6f22d\", \"lessThan\": \"fe20e3d56bc911408fc3c27a17c59e9d7885f7d1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8399918f3056e1033f0f4c08eab437fb38d6f22d\", \"lessThan\": \"a9545af2a533739ffb64d6c9a6fec6f13e2b505f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8399918f3056e1033f0f4c08eab437fb38d6f22d\", \"lessThan\": \"3da9d32b7f4a1a9f7e4bb15bb82f2b2dd6719447\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8399918f3056e1033f0f4c08eab437fb38d6f22d\", \"lessThan\": \"24228dcf1d30c2231caa332be7d3090ac59fbfe9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8399918f3056e1033f0f4c08eab437fb38d6f22d\", \"lessThan\": \"73a2aa0aef86c2c07be5a2f42c9e6047e1a2f7bb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8399918f3056e1033f0f4c08eab437fb38d6f22d\", \"lessThan\": \"cb5942b77c05d54310a0420cac12935e9b6aa21c\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/wireless/microchip/wilc1000/netdev.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.214\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.153\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.83\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.23\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/wireless/microchip/wilc1000/netdev.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5956f4203b6cdd0755bbdd21b45f3933c7026208\"}, {\"url\": \"https://git.kernel.org/stable/c/fe20e3d56bc911408fc3c27a17c59e9d7885f7d1\"}, {\"url\": \"https://git.kernel.org/stable/c/a9545af2a533739ffb64d6c9a6fec6f13e2b505f\"}, {\"url\": \"https://git.kernel.org/stable/c/3da9d32b7f4a1a9f7e4bb15bb82f2b2dd6719447\"}, {\"url\": \"https://git.kernel.org/stable/c/24228dcf1d30c2231caa332be7d3090ac59fbfe9\"}, {\"url\": \"https://git.kernel.org/stable/c/73a2aa0aef86c2c07be5a2f42c9e6047e1a2f7bb\"}, {\"url\": \"https://git.kernel.org/stable/c/cb5942b77c05d54310a0420cac12935e9b6aa21c\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwifi: wilc1000: prevent use-after-free on vif when cleaning up all interfaces\\n\\nwilc_netdev_cleanup currently triggers a KASAN warning, which can be\\nobserved on interface registration error path, or simply by\\nremoving the module/unbinding device from driver:\\n\\necho spi0.1 \u003e /sys/bus/spi/drivers/wilc1000_spi/unbind\\n\\n==================================================================\\nBUG: KASAN: slab-use-after-free in wilc_netdev_cleanup+0x508/0x5cc\\nRead of size 4 at addr c54d1ce8 by task sh/86\\n\\nCPU: 0 PID: 86 Comm: sh Not tainted 6.8.0-rc1+ #117\\nHardware name: Atmel SAMA5\\n unwind_backtrace from show_stack+0x18/0x1c\\n show_stack from dump_stack_lvl+0x34/0x58\\n dump_stack_lvl from print_report+0x154/0x500\\n print_report from kasan_report+0xac/0xd8\\n kasan_report from wilc_netdev_cleanup+0x508/0x5cc\\n wilc_netdev_cleanup from wilc_bus_remove+0xc8/0xec\\n wilc_bus_remove from spi_remove+0x8c/0xac\\n spi_remove from device_release_driver_internal+0x434/0x5f8\\n device_release_driver_internal from unbind_store+0xbc/0x108\\n unbind_store from kernfs_fop_write_iter+0x398/0x584\\n kernfs_fop_write_iter from vfs_write+0x728/0xf88\\n vfs_write from ksys_write+0x110/0x1e4\\n ksys_write from ret_fast_syscall+0x0/0x1c\\n\\n[...]\\n\\nAllocated by task 1:\\n kasan_save_track+0x30/0x5c\\n __kasan_kmalloc+0x8c/0x94\\n __kmalloc_node+0x1cc/0x3e4\\n kvmalloc_node+0x48/0x180\\n alloc_netdev_mqs+0x68/0x11dc\\n alloc_etherdev_mqs+0x28/0x34\\n wilc_netdev_ifc_init+0x34/0x8ec\\n wilc_cfg80211_init+0x690/0x910\\n wilc_bus_probe+0xe0/0x4a0\\n spi_probe+0x158/0x1b0\\n really_probe+0x270/0xdf4\\n __driver_probe_device+0x1dc/0x580\\n driver_probe_device+0x60/0x140\\n __driver_attach+0x228/0x5d4\\n bus_for_each_dev+0x13c/0x1a8\\n bus_add_driver+0x2a0/0x608\\n driver_register+0x24c/0x578\\n do_one_initcall+0x180/0x310\\n kernel_init_freeable+0x424/0x484\\n kernel_init+0x20/0x148\\n ret_from_fork+0x14/0x28\\n\\nFreed by task 86:\\n kasan_save_track+0x30/0x5c\\n kasan_save_free_info+0x38/0x58\\n __kasan_slab_free+0xe4/0x140\\n kfree+0xb0/0x238\\n device_release+0xc0/0x2a8\\n kobject_put+0x1d4/0x46c\\n netdev_run_todo+0x8fc/0x11d0\\n wilc_netdev_cleanup+0x1e4/0x5cc\\n wilc_bus_remove+0xc8/0xec\\n spi_remove+0x8c/0xac\\n device_release_driver_internal+0x434/0x5f8\\n unbind_store+0xbc/0x108\\n kernfs_fop_write_iter+0x398/0x584\\n vfs_write+0x728/0xf88\\n ksys_write+0x110/0x1e4\\n ret_fast_syscall+0x0/0x1c\\n [...]\\n\\nDavid Mosberger-Tan initial investigation [1] showed that this\\nuse-after-free is due to netdevice unregistration during vif list\\ntraversal. When unregistering a net device, since the needs_free_netdev has\\nbeen set to true during registration, the netdevice object is also freed,\\nand as a consequence, the corresponding vif object too, since it is\\nattached to it as private netdevice data. The next occurrence of the loop\\nthen tries to access freed vif pointer to the list to move forward in the\\nlist.\\n\\nFix this use-after-free thanks to two mechanisms:\\n- navigate in the list with list_for_each_entry_safe, which allows to\\n  safely modify the list as we go through each element. For each element,\\n  remove it from the list with list_del_rcu\\n- make sure to wait for RCU grace period end after each vif removal to make\\n  sure it is safe to free the corresponding vif too (through\\n  unregister_netdev)\\n\\nSince we are in a RCU \\\"modifier\\\" path (not a \\\"reader\\\" path), and because\\nsuch path is expected not to be concurrent to any other modifier (we are\\nusing the vif_mutex lock), we do not need to use RCU list API, that\u0027s why\\nwe can benefit from list_for_each_entry_safe.\\n\\n[1] https://lore.kernel.org/linux-wireless/ab077dbe58b1ea5de0a3b2ca21f275a07af967d2.camel@egauge.net/\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.214\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.153\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.83\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.23\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.11\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.2\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"5.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:28:12.722Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26895\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:28:12.722Z\", \"dateReserved\": \"2024-02-19T14:20:24.186Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T10:27:46.585Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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