CVE-2024-56661

Description

In the Linux kernel, the following vulnerability has been resolved: tipc: fix NULL deref in cleanup_bearer() syzbot found [1] that after blamed commit, ub->ubsock->sk was NULL when attempting the atomic_dec() : atomic_dec(&tipc_net(sock_net(ub->ubsock->sk))->wq_count); Fix this by caching the tipc_net pointer. [1] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 5896 Comm: kworker/0:3 Not tainted 6.13.0-rc1-next-20241203-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events cleanup_bearer RIP: 0010:read_pnet include/net/net_namespace.h:387 [inline] RIP: 0010:sock_net include/net/sock.h:655 [inline] RIP: 0010:cleanup_bearer+0x1f7/0x280 net/tipc/udp_media.c:820 Code: 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 3c f7 99 f6 48 8b 1b 48 83 c3 30 e8 f0 e4 60 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 1a f7 99 f6 49 83 c7 e8 48 8b 1b RSP: 0018:ffffc9000410fb70 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff88802fe45a00 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc9000410f900 RBP: ffff88807e1f0908 R08: ffffc9000410f907 R09: 1ffff92000821f20 R10: dffffc0000000000 R11: fffff52000821f21 R12: ffff888031d19980 R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff88807e1f0918 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556ca050b000 CR3: 0000000031c0c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Reserved 2024-12-27 | Published 2024-12-27 | Updated 2025-01-20 | Assigner Linux

Product status

Default status
unaffected

4e69457f9dfae67435f3ccf29008768eae860415 before d1d4dfb189a115734bff81c411bc58d9e348db7d
affected

650ee9a22d7a2de8999fac2d45983597a0c22359 before a771f349c95d3397636861a0a6462d4a7a7ecb25
affected

d2a4894f238551eae178904e7f45af87577074fd before 07b569eda6fe6a1e83be5a587abee12d1303f95e
affected

d62d5180c036eeac09f80660edc7a602b369125f before 754ec823ee53422361da7958a8c8bf3275426912
affected

d00d4470bf8c4282617a3a10e76b20a9c7e4cffa before 89ecda492d0a37fd00aaffc4151f1f44c26d93ac
affected

e48b211c4c59062cb6dd6c2c37c51a7cc235a464 before a852c82eda4991e21610837aaa160965be71f5cc
affected

6a2fa13312e51a621f652d522d7e2df7066330b6 before b04d86fff66b15c07505d226431f808c15b1703c
affected

Default status
unaffected

5.4.287 before 5.4.288
affected

5.10.231 before 5.10.232
affected

5.15.174 before 5.15.175
affected

6.1.120 before 6.1.121
affected

6.6.66 before 6.6.67
affected

6.12.5 before 6.12.6
affected

References

git.kernel.org/...c/d1d4dfb189a115734bff81c411bc58d9e348db7d

git.kernel.org/...c/a771f349c95d3397636861a0a6462d4a7a7ecb25

git.kernel.org/...c/07b569eda6fe6a1e83be5a587abee12d1303f95e

git.kernel.org/...c/754ec823ee53422361da7958a8c8bf3275426912

git.kernel.org/...c/89ecda492d0a37fd00aaffc4151f1f44c26d93ac

git.kernel.org/...c/a852c82eda4991e21610837aaa160965be71f5cc

git.kernel.org/...c/b04d86fff66b15c07505d226431f808c15b1703c

cve.org (CVE-2024-56661)

nvd.nist.gov (CVE-2024-56661)

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