cbcvebase.
CVE-2024-50301
published 2024-11-19

CVE-2024-50301: In the Linux kernel, the following vulnerability has been resolved: security/keys: fix slab-out-of-bounds in key_task_permission KASAN reports an out of bounds…

PriorityP431high7.1CVSS 3.1
AVLACLPRLUINSUCHINAH
EPSS
0.27%
19.6th percentile
In the Linux kernel, the following vulnerability has been resolved: security/keys: fix slab-out-of-bounds in key_task_permission KASAN reports an out of bounds read: BUG: KASAN: slab-out-of-bounds in __kuid_val include/linux/uidgid.h:36 BUG: KASAN: slab-out-of-bounds in uid_eq include/linux/uidgid.h:63 [inline] BUG: KASAN: slab-out-of-bounds in key_task_permission+0x394/0x410 security/keys/permission.c:54 Read of size 4 at addr ffff88813c3ab618 by task stress-ng/4362 CPU: 2 PID: 4362 Comm: stress-ng Not tainted 5.10.0-14930-gafbffd6c3ede #15 Call Trace: __dump_stack lib/dump_stack.c:82 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:123 print_address_description.constprop.0+0x19/0x170 mm/kasan/report.c:400 __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560 kasan_report+0x3a/0x50 mm/kasan/report.c:585 __kuid_val include/linux/uidgid.h:36 [inline] uid_eq include/linux/uidgid.h:63 [inline] key_task_permission+0x394/0x410 security/keys/permission.c:54 search_nested_keyrings+0x90e/0xe90 security/keys/keyring.c:793 This issue was also reported by syzbot. It can be reproduced by following these steps(more details [1]): 1. Obtain more than 32 inputs that have similar hashes, which ends with the pattern '0xxxxxxxe6'. 2. Reboot and add the keys obtained in step 1. The reproducer demonstrates how this issue happened: 1. In the search_nested_keyrings function, when it iterates through the slots in a node(below tag ascend_to_node), if the slot pointer is meta and node->back_pointer != NULL(it means a root), it will proceed to descend_to_node. However, there is an exception. If node is the root, and one of the slots points to a shortcut, it will be treated as a keyring. 2. Whether the ptr is keyring decided by keyring_ptr_is_keyring function. However, KEYRING_PTR_SUBTYPE is 0x2UL, the same as ASSOC_ARRAY_PTR_SUBTYPE_MASK. 3. When 32 keys with the similar hashes are added to the tree, the ROOT has keys with hashes that are not similar (e.g. slot 0) and it splits NODE A wit

Affected

33 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.119-1 (bookworm)linux 6.1.119-1 (bookworm)
debianlinux-6.1< linux 6.1.119-1 (bookworm)linux 6.1.119-1 (bookworm)
linuxlinux
linuxlinux>= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < c3ce634ad953ce48c75c39bdfd8b711dd95f346fc3ce634ad953ce48c75c39bdfd8b711dd95f346f
linuxlinux>= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < 4efb69a0e294ef201bcdf7ce3d6202cd0a545a5d4efb69a0e294ef201bcdf7ce3d6202cd0a545a5d
linuxlinux>= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < 1e4332581cd4eed75aea77af6f66cdcdda8b49b91e4332581cd4eed75aea77af6f66cdcdda8b49b9
linuxlinux>= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < 199c20fb7499c79557a075dc24e9a7dae7d9f1ce199c20fb7499c79557a075dc24e9a7dae7d9f1ce
linuxlinux>= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < bbad2d5b6c99db468d8f88b6ba6a56ed409b4881bbad2d5b6c99db468d8f88b6ba6a56ed409b4881
linuxlinux>= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < 3e79ad156bedf2da0ab909a118d2cec6c9c22b793e79ad156bedf2da0ab909a118d2cec6c9c22b79
linuxlinux>= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < e0a317ad68e4ea48a0158187238c5407e4fdec8be0a317ad68e4ea48a0158187238c5407e4fdec8b
linuxlinux>= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < 4a74da044ec9ec8679e6beccc4306b936b62873f4a74da044ec9ec8679e6beccc4306b936b62873f
linuxlinux_kernel
linuxlinux_kernel>= 0 < 5.10.234-15.10.234-1
linuxlinux_kernel>= 0 < 6.1.119-16.1.119-1
linuxlinux_kernel>= 0 < 6.11.9-16.11.9-1
linuxlinux_kernel>= 0 < 6.11.9-16.11.9-1
linuxlinux_kernel>= 0 < 5.4.0-208.2285.4.0-208.228
linuxlinux_kernel>= 0 < 5.15.0-133.1445.15.0-133.144
linuxlinux_kernel>= 0 < 6.8.0-58.606.8.0-58.60
linuxlinux_kernel>= 0 < 6.11.0-18.186.11.0-18.18
linuxlinux_kernel>= 3.13 < 4.19.3244.19.324
linuxlinux_kernel>= 4.20 < 5.4.2865.4.286
linuxlinux_kernel>= 5.11 < 5.15.1725.15.172
linuxlinux_kernel>= 5.16 < 6.1.1176.1.117
linuxlinux_kernel>= 5.5 < 5.10.2305.10.230

CVSS provenance

nvdv3.17.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
osv8.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian7.1HIGH
vendor_msrc7.1HIGH
vendor_redhat7.1HIGH
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.