CVE-2022-50259

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <4cabc3af4a6f36c222fecb15858c1060e59218e7, <a443c55d96dede82a724df6e70a318ad15c199e1, <5c3568166129bc73fd6b37748d2d8f95cd8f22f3, 0, <be719496ae6a7fc325e9e5056a52f63ebc84cc0c, <=5.10.*, <=6.0.*, 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b, 5.4.229, 20ae0cb8983b05136d5293c47fadc99a8ca8ca2d, 6.0.16, <=5.4.*, <e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62, <5.5, 5.5, 5.10.163, <=*, <=5.15.*, <5.4.229, 6.1.2, <0a182f8d607464911756b4dbef5d6cad8de22469, 5.4.14, 6.2, 5.15.86

Description

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: fix race in sock_map_free() sock_map_free() calls release_sock(sk) without owning a reference on the socket. This can cause use-after-free as syzbot found [1] Jakub Sitnicki already took care of a similar issue in sock_hash_free() in commit 75e68e5bf2c7 ("bpf, sockhash: Synchronize delete from bucket list on map free") [1] refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 0 PID: 3785 at lib/refcount.c:31 refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31 Modules linked in: CPU: 0 PID: 3785 Comm: kworker/u4:6 Not tainted 6.1.0-rc7-syzkaller-00103-gef4d3ea40565 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events_unbound bpf_map_free_deferred RIP: 0010:refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31 Code: 68 8b 31 c0 e8 75 71 15 fd 0f 0b e9 64 ff ff ff e8 d9 6e 4e fd c6 05 62 9c 3d 0a 01 48 c7 c7 80 bb 68 8b 31 c0 e8 54 71 15 fd <0f> 0b e9 43 ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c a2 fe ff RSP: 0018:ffffc9000456fb60 EFLAGS: 00010246 RAX: eae59bab72dcd700 RBX: 0000000000000004 RCX: ffff8880207057c0 RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffffffff816fdabd R09: fffff520008adee5 R10: fffff520008adee5 R11: 1ffff920008adee4 R12: 0000000000000004 R13: dffffc0000000000 R14: ffff88807b1c6c00 R15: 1ffff1100f638dcf FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30c30000 CR3: 000000000d08e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __refcount_dec include/linux/refcount.h:344 [inline] refcount_dec include/linux/refcount.h:359 [inline] __sock_put include/net/sock.h:779 [inline] tcp_release_cb+0x2d0/0x360 net/ipv4/tcp_output.c:1092 release_sock+0xaf/0x1c0 net/core/sock.c:3468 sock_map_free+0x219/0x2c0 net/core/sock_map.c:356 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK>

Gravité et risque d'exploitation

CVE-2022-50259 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.12 %, ce qui la place devant 1.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <4cabc3af4a6f36c222fecb15858c1060e59218e7, <a443c55d96dede82a724df6e70a318ad15c199e1, <5c3568166129bc73fd6b37748d2d8f95cd8f22f3, 0, <be719496ae6a7fc325e9e5056a52f63ebc84cc0c, <=5.10.*, <=6.0.*, 7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b, 5.4.229, 20ae0cb8983b05136d5293c47fadc99a8ca8ca2d, 6.0.16, <=5.4.*, <e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62, <5.5, 5.5, 5.10.163, <=*, <=5.15.*, <5.4.229, 6.1.2, <0a182f8d607464911756b4dbef5d6cad8de22469, 5.4.14, 6.2, 5.15.86) 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