7.8

CVE-2024-26961

In the Linux kernel, the following vulnerability has been resolved:

mac802154: fix llsec key resources release in mac802154_llsec_key_del

mac802154_llsec_key_del() can free resources of a key directly without
following the RCU rules for waiting before the end of a grace period. This
may lead to use-after-free in case llsec_lookup_key() is traversing the
list of keys in parallel with a key deletion:

refcount_t: addition on 0; use-after-free.
WARNING: CPU: 4 PID: 16000 at lib/refcount.c:25 refcount_warn_saturate+0x162/0x2a0
Modules linked in:
CPU: 4 PID: 16000 Comm: wpan-ping Not tainted 6.7.0 #19
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:refcount_warn_saturate+0x162/0x2a0
Call Trace:
 <TASK>
 llsec_lookup_key.isra.0+0x890/0x9e0
 mac802154_llsec_encrypt+0x30c/0x9c0
 ieee802154_subif_start_xmit+0x24/0x1e0
 dev_hard_start_xmit+0x13e/0x690
 sch_direct_xmit+0x2ae/0xbc0
 __dev_queue_xmit+0x11dd/0x3c20
 dgram_sendmsg+0x90b/0xd60
 __sys_sendto+0x466/0x4c0
 __x64_sys_sendto+0xe0/0x1c0
 do_syscall_64+0x45/0xf0
 entry_SYSCALL_64_after_hwframe+0x6e/0x76

Also, ieee802154_llsec_key_entry structures are not freed by
mac802154_llsec_key_del():

unreferenced object 0xffff8880613b6980 (size 64):
  comm "iwpan", pid 2176, jiffies 4294761134 (age 60.475s)
  hex dump (first 32 bytes):
    78 0d 8f 18 80 88 ff ff 22 01 00 00 00 00 ad de  x.......".......
    00 00 00 00 00 00 00 00 03 00 cd ab 00 00 00 00  ................
  backtrace:
    [<ffffffff81dcfa62>] __kmem_cache_alloc_node+0x1e2/0x2d0
    [<ffffffff81c43865>] kmalloc_trace+0x25/0xc0
    [<ffffffff88968b09>] mac802154_llsec_key_add+0xac9/0xcf0
    [<ffffffff8896e41a>] ieee802154_add_llsec_key+0x5a/0x80
    [<ffffffff8892adc6>] nl802154_add_llsec_key+0x426/0x5b0
    [<ffffffff86ff293e>] genl_family_rcv_msg_doit+0x1fe/0x2f0
    [<ffffffff86ff46d1>] genl_rcv_msg+0x531/0x7d0
    [<ffffffff86fee7a9>] netlink_rcv_skb+0x169/0x440
    [<ffffffff86ff1d88>] genl_rcv+0x28/0x40
    [<ffffffff86fec15c>] netlink_unicast+0x53c/0x820
    [<ffffffff86fecd8b>] netlink_sendmsg+0x93b/0xe60
    [<ffffffff86b91b35>] ____sys_sendmsg+0xac5/0xca0
    [<ffffffff86b9c3dd>] ___sys_sendmsg+0x11d/0x1c0
    [<ffffffff86b9c65a>] __sys_sendmsg+0xfa/0x1d0
    [<ffffffff88eadbf5>] do_syscall_64+0x45/0xf0
    [<ffffffff890000ea>] entry_SYSCALL_64_after_hwframe+0x6e/0x76

Handle the proper resource release in the RCU callback function
mac802154_llsec_key_del_rcu().

Note that if llsec_lookup_key() finds a key, it gets a refcount via
llsec_key_get() and locally copies key id from key_entry (which is a
list element). So it's safe to call llsec_key_put() and free the list
entry after the RCU grace period elapses.

Found by Linux Verification Center (linuxtesting.org).
Data is provided by the National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 3.16 < 5.10.215
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.154
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.84
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.24
Linux ≫ Linux Kernel Version >= 6.7 < 6.7.12
Linux ≫ Linux Kernel Version >= 6.8 < 6.8.3
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.01% 0.011
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.