CVE-2022-50295: In the Linux kernel, the following vulnerability has been resolved: io_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd() Syzkaller produced the…

PriorityP421medium5.5CVSS 3.1

AVLACLPRLUINSUCNINAH

EPSS

0.13%

2.8th percentile

In the Linux kernel, the following vulnerability has been resolved: io_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd() Syzkaller produced the below call trace: BUG: KASAN: null-ptr-deref in io_msg_ring+0x3cb/0x9f0 Write of size 8 at addr 0000000000000070 by task repro/16399 CPU: 0 PID: 16399 Comm: repro Not tainted 6.1.0-rc1 #28 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 Call Trace: dump_stack_lvl+0xcd/0x134 ? io_msg_ring+0x3cb/0x9f0 kasan_report+0xbc/0xf0 ? io_msg_ring+0x3cb/0x9f0 kasan_check_range+0x140/0x190 io_msg_ring+0x3cb/0x9f0 ? io_msg_ring_prep+0x300/0x300 io_issue_sqe+0x698/0xca0 io_submit_sqes+0x92f/0x1c30 __do_sys_io_uring_enter+0xae4/0x24b0 .... RIP: 0033:0x7f2eaf8f8289 RSP: 002b:00007fff40939718 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2eaf8f8289 RDX: 0000000000000000 RSI: 0000000000006f71 RDI: 0000000000000004 RBP: 00007fff409397a0 R08: 0000000000000000 R09: 0000000000000039 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004006d0 R13: 00007fff40939880 R14: 0000000000000000 R15: 0000000000000000 Kernel panic - not syncing: panic_on_warn set ... We don't have a NULL check on file_ptr in io_msg_send_fd() function, so when file_ptr is NUL src_file is also NULL and get_file() dereferences a NULL pointer and leads to above crash. Add a NULL check to fix this issue.

Affected

9 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.0.6-1 (bookworm)	linux 6.0.6-1 (bookworm)
linux	linux	—	—
linux	linux	>= e6130eba8a848a7a6ba6c534bd8f6d60749ae1a9 < 0163e04ea64cc3dfaa12390286e5f2f481c3b2e3	0163e04ea64cc3dfaa12390286e5f2f481c3b2e3
linux	linux	>= e6130eba8a848a7a6ba6c534bd8f6d60749ae1a9 < 16bbdfe5fb0e78e0acb13e45fc127e9a296913f2	16bbdfe5fb0e78e0acb13e45fc127e9a296913f2
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 6.0.6-1	6.0.6-1
linux	linux_kernel	>= 0 < 6.0.6-1	6.0.6-1
linux	linux_kernel	>= 0 < 6.0.6-1	6.0.6-1
linux	linux_kernel	>= 6.0 < 6.0.6	6.0.6

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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