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CVE-2024-26961

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.0 · Élevée
EPSS 0.2%
Linux•Linux•Versions : 6.9, <=6.1.*, <49c8951680d7b76fceaee89dcfbab1363fb24fd1, 0, 5.15.154, 6.8.3, <=5.10.*, <=6.6.*, 5.10.215, <d3d858650933d44ac12c1f31337e7110c2071821, 5d637d5aabd85132bd85779677d8acb708e0ed90, <=6.8.*, <640297c3e897bd7e1481466a6a5cb9560f1edb88, 6.7.12, <068ab2759bc0b4daf0b964de61b2731449c86531, <20d3e1c8a1847497269f04d874b2a5818ec29e2d, <=*, <=5.15.*, <=6.7.*, 3.16, <3.16, <dcd51ab42b7a0431575689c5f74b8b6efd45fc2f, <e8a1e58345cf40b7b272e08ac7b32328b2543e40, 6.1.84, 6.6.24

Description

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).

Gravité et risque d'exploitation

CVE-2024-26961 obtient un score CVSS de 7.0/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.24 %, ce qui la place devant 14.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.9, <=6.1.*, <49c8951680d7b76fceaee89dcfbab1363fb24fd1, 0, 5.15.154, 6.8.3, <=5.10.*, <=6.6.*, 5.10.215, <d3d858650933d44ac12c1f31337e7110c2071821, 5d637d5aabd85132bd85779677d8acb708e0ed90, <=6.8.*, <640297c3e897bd7e1481466a6a5cb9560f1edb88, 6.7.12, <068ab2759bc0b4daf0b964de61b2731449c86531, <20d3e1c8a1847497269f04d874b2a5818ec29e2d, <=*, <=5.15.*, <=6.7.*, 3.16, <3.16, <dcd51ab42b7a0431575689c5f74b8b6efd45fc2f, <e8a1e58345cf40b7b272e08ac7b32328b2543e40, 6.1.84, 6.6.24) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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