cbcvebase.
CVE-2022-48970
published 2024-10-21

CVE-2022-48970: In the Linux kernel, the following vulnerability has been resolved: af_unix: Get user_ns from in_skb in unix_diag_get_exact(). Wei Chen reported a NULL deref…

PriorityP421medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.24%
15.8th percentile
In the Linux kernel, the following vulnerability has been resolved: af_unix: Get user_ns from in_skb in unix_diag_get_exact(). Wei Chen reported a NULL deref in sk_user_ns() [0][1], and Paolo diagnosed the root cause: in unix_diag_get_exact(), the newly allocated skb does not have sk. [2] We must get the user_ns from the NETLINK_CB(in_skb).sk and pass it to sk_diag_fill(). [0]: BUG: kernel NULL pointer dereference, address: 0000000000000270 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 12bbce067 P4D 12bbce067 PUD 12bc40067 PMD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 0 PID: 27942 Comm: syz-executor.0 Not tainted 6.1.0-rc5-next-20221118 #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014 RIP: 0010:sk_user_ns include/net/sock.h:920 [inline] RIP: 0010:sk_diag_dump_uid net/unix/diag.c:119 [inline] RIP: 0010:sk_diag_fill+0x77d/0x890 net/unix/diag.c:170 Code: 89 ef e8 66 d4 2d fd c7 44 24 40 00 00 00 00 49 8d 7c 24 18 e8 54 d7 2d fd 49 8b 5c 24 18 48 8d bb 70 02 00 00 e8 43 d7 2d fd 8b 9b 70 02 00 00 48 8d 7b 10 e8 33 d7 2d fd 48 8b 5b 10 48 8d RSP: 0018:ffffc90000d67968 EFLAGS: 00010246 RAX: ffff88812badaa48 RBX: 0000000000000000 RCX: ffffffff840d481d RDX: 0000000000000465 RSI: 0000000000000000 RDI: 0000000000000270 RBP: ffffc90000d679a8 R08: 0000000000000277 R09: 0000000000000000 R10: 0001ffffffffffff R11: 0001c90000d679a8 R12: ffff88812ac03800 R13: ffff88812c87c400 R14: ffff88812ae42210 R15: ffff888103026940 FS: 00007f08b4e6f700(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000270 CR3: 000000012c58b000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unix_diag_get_exact net/unix/diag.c:285 [inline] unix_diag_handler_dump+0x3f9/0x500 net/unix/diag.c:317 __sock_diag_cmd net/c

Affected

16 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.4-1 (bookworm)linux 6.1.4-1 (bookworm)
linuxlinux——
linuxlinux>= cae9910e73446cac68a54e3a7b02aaa12b689026 < c66d78aee55dab72c92020ebfbebc464d4f5dd2ac66d78aee55dab72c92020ebfbebc464d4f5dd2a
linuxlinux>= cae9910e73446cac68a54e3a7b02aaa12b689026 < 575a6266f63dbb3b8eb1da03671451f0d81b8034575a6266f63dbb3b8eb1da03671451f0d81b8034
linuxlinux>= cae9910e73446cac68a54e3a7b02aaa12b689026 < 5c014eb0ed6c8c57f483e94cc6e90f34ce426d915c014eb0ed6c8c57f483e94cc6e90f34ce426d91
linuxlinux>= cae9910e73446cac68a54e3a7b02aaa12b689026 < 9c1d6f79a2c7b8221dcec27defc6dc461052ead49c1d6f79a2c7b8221dcec27defc6dc461052ead4
linuxlinux>= cae9910e73446cac68a54e3a7b02aaa12b689026 < b3abe42e94900bdd045c472f9c9be620ba5ce553b3abe42e94900bdd045c472f9c9be620ba5ce553
linuxlinux_kernel——
linuxlinux_kernel>= 0 < 5.10.162-15.10.162-1
linuxlinux_kernel>= 0 < 6.1.4-16.1.4-1
linuxlinux_kernel>= 0 < 6.1.4-16.1.4-1
linuxlinux_kernel>= 0 < 6.1.4-16.1.4-1
linuxlinux_kernel>= 5.11 < 5.15.835.15.83
linuxlinux_kernel>= 5.16 < 6.0.136.0.13
linuxlinux_kernel>= 5.3 < 5.4.2275.4.227
linuxlinux_kernel>= 5.5 < 5.10.1595.10.159

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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