TLDRVuln - Cybersecurity Vulnerabilities Made Simple

In the Linux kernel, the following vulnerability has been resolved:

atm: clip: Fix NULL pointer dereference in vcc_sendmsg()

atmarpd_dev_ops does not implement the send method, which may cause crash

as bellow.

BUG: kernel NULL pointer dereference, address: 0000000000000000

PGD 0 P4D 0

Oops: Oops: 0010 [#1] SMP KASAN NOPTI

CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted 6.15.0-rc6-syzkaller-00346-g5723cc3450bc #0 PREEMPT(full)

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014

RIP: 0010:0x0

Code: Unable to access opcode bytes at 0xffffffffffffffd6.

RSP: 0018:ffffc9000d3cf778 EFLAGS: 00010246

RAX: 1ffffffff1910dd1 RBX: 00000000000000c0 RCX: dffffc0000000000

RDX: ffffc9000dc82000 RSI: ffff88803e4c4640 RDI: ffff888052cd0000

RBP: ffffc9000d3cf8d0 R08: ffff888052c9143f R09: 1ffff1100a592287

R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff92001a79f00

R13: ffff888052cd0000 R14: ffff88803e4c4640 R15: ffffffff8c886e88

FS: 00007fbc762566c0(0000) GS:ffff88808d6c2000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: ffffffffffffffd6 CR3: 0000000041f1b000 CR4: 0000000000352ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:

<TASK>

vcc_sendmsg+0xa10/0xc50 net/atm/common.c:644

sock_sendmsg_nosec net/socket.c:712 [inline]

__sock_sendmsg+0x219/0x270 net/socket.c:727

____sys_sendmsg+0x52d/0x830 net/socket.c:2566

___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620

__sys_sendmmsg+0x227/0x430 net/socket.c:2709

__do_sys_sendmmsg net/socket.c:2736 [inline]

__se_sys_sendmmsg net/socket.c:2733 [inline]

__x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2733

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x77/0x7f