gsd-2024-26895
Vulnerability from gsd
Modified
2024-02-20 06:02
Details
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/
Aliases
{ "gsd": { "metadata": { "exploitCode": "unknown", "remediation": "unknown", "reportConfidence": "confirmed", "type": "vulnerability" }, "osvSchema": { "aliases": [ "CVE-2024-26895" ], "details": "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/", "id": "GSD-2024-26895", "modified": "2024-02-20T06:02:29.068471Z", "schema_version": "1.4.0" } }, "namespaces": { "cve.org": { "CVE_data_meta": { "ASSIGNER": "cve@kernel.org", "ID": "CVE-2024-26895", "STATE": "PUBLIC" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "\u003c", "version_name": "8399918f3056", "version_value": "5956f4203b6c" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "defaultStatus": "affected", "versions": [ { "status": "affected", "version": "5.5" }, { "lessThan": "5.5", "status": "unaffected", "version": "0", "versionType": "custom" }, { "lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.214", "versionType": "custom" }, { "lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.153", "versionType": "custom" }, { "lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.83", "versionType": "custom" }, { "lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.23", "versionType": "custom" }, { "lessThanOrEqual": "6.7.*", "status": "unaffected", "version": "6.7.11", "versionType": "custom" }, { "lessThanOrEqual": "6.8.*", "status": "unaffected", "version": "6.8.2", "versionType": "custom" }, { "lessThanOrEqual": "*", "status": "unaffected", "version": "6.9-rc1", "versionType": "original_commit_for_fix" } ] } } ] } } ] }, "vendor_name": "Linux" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "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/" } ] }, "generator": { "engine": "bippy-d175d3acf727" }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "references": { "reference_data": [ { "name": "https://git.kernel.org/stable/c/5956f4203b6cdd0755bbdd21b45f3933c7026208", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/5956f4203b6cdd0755bbdd21b45f3933c7026208" }, { "name": "https://git.kernel.org/stable/c/fe20e3d56bc911408fc3c27a17c59e9d7885f7d1", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/fe20e3d56bc911408fc3c27a17c59e9d7885f7d1" }, { "name": "https://git.kernel.org/stable/c/a9545af2a533739ffb64d6c9a6fec6f13e2b505f", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/a9545af2a533739ffb64d6c9a6fec6f13e2b505f" }, { "name": "https://git.kernel.org/stable/c/3da9d32b7f4a1a9f7e4bb15bb82f2b2dd6719447", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/3da9d32b7f4a1a9f7e4bb15bb82f2b2dd6719447" }, { "name": "https://git.kernel.org/stable/c/24228dcf1d30c2231caa332be7d3090ac59fbfe9", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/24228dcf1d30c2231caa332be7d3090ac59fbfe9" }, { "name": "https://git.kernel.org/stable/c/73a2aa0aef86c2c07be5a2f42c9e6047e1a2f7bb", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/73a2aa0aef86c2c07be5a2f42c9e6047e1a2f7bb" }, { "name": "https://git.kernel.org/stable/c/cb5942b77c05d54310a0420cac12935e9b6aa21c", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/cb5942b77c05d54310a0420cac12935e9b6aa21c" } ] } }, "nvd.nist.gov": { "cve": { "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/" } ], "id": "CVE-2024-26895", "lastModified": "2024-04-17T12:48:07.510", "metrics": {}, "published": "2024-04-17T11:15:10.677", "references": [ { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/24228dcf1d30c2231caa332be7d3090ac59fbfe9" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3da9d32b7f4a1a9f7e4bb15bb82f2b2dd6719447" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5956f4203b6cdd0755bbdd21b45f3933c7026208" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/73a2aa0aef86c2c07be5a2f42c9e6047e1a2f7bb" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a9545af2a533739ffb64d6c9a6fec6f13e2b505f" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cb5942b77c05d54310a0420cac12935e9b6aa21c" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fe20e3d56bc911408fc3c27a17c59e9d7885f7d1" } ], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis" } } } }
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Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.