CVE-2023-53439: net: skb_partial_csum_set() fix against transport header magic value
In the Linux kernel, the following vulnerability has been resolved:
net: skbpartialcsumset() fix against transport header magic value
skb->transportheader uses the special 0xFFFF value to mark if the transport header was set or not.
We must prevent callers to accidentaly set skb->transportheader to 0xFFFF. Note that only fuzzers can possibly do this today.
syzbot reported:
WARNING: CPU: 0 PID: 2340 at include/linux/skbuff.h:2847 skbtransportoffset include/linux/skbuff.h:2956 [inline] WARNING: CPU: 0 PID: 2340 at include/linux/skbuff.h:2847 virtionethdrtoskb+0xbcc/0x10c0 include/linux/virtionet.h:103 Modules linked in: CPU: 0 PID: 2340 Comm: syz-executor.0 Not tainted 6.3.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 RIP: 0010:skbtransportheader include/linux/skbuff.h:2847 [inline] RIP: 0010:skbtransportoffset include/linux/skbuff.h:2956 [inline] RIP: 0010:virtionethdrtoskb+0xbcc/0x10c0 include/linux/virtionet.h:103 Code: 41 39 df 0f 82 c3 04 00 00 48 8b 7c 24 10 44 89 e6 e8 08 6e 59 ff 48 85 c0 74 54 e8 ce 36 7e fc e9 37 f8 ff ff e8 c4 36 7e fc <0f> 0b e9 93 f8 ff ff 44 89 f7 44 89 e6 e8 32 38 7e fc 45 39 e6 0f RSP: 0018:ffffc90004497880 EFLAGS: 00010293 RAX: ffffffff84fea55c RBX: 000000000000ffff RCX: ffff888120be2100 RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff RBP: ffffc90004497990 R08: ffffffff84fe9de5 R09: 0000000000000034 R10: ffffea00048ebd80 R11: 0000000000000034 R12: ffff88811dc2d9c8 R13: dffffc0000000000 R14: ffff88811dc2d9ae R15: 1ffff11023b85b35 FS: 00007f9211a59700(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200002c0 CR3: 00000001215a5000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> packetsnd net/packet/afpacket.c:3076 [inline] packetsendmsg+0x4590/0x61a0 net/packet/afpacket.c:3115 socksendmsgnosec net/socket.c:724 [inline] socksendmsg net/socket.c:747 [inline] syssendto+0x472/0x630 net/socket.c:2144 dosyssendto net/socket.c:2156 [inline] sesyssendto net/socket.c:2152 [inline] x64syssendto+0xe5/0x100 net/socket.c:2152 dosyscallx64 arch/x86/entry/common.c:50 [inline] dosyscall64+0x2f/0x50 arch/x86/entry/common.c:80 entrySYSCALL64afterhwframe+0x63/0xcd RIP: 0033:0x7f9210c8c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9211a59168 EFLAGS: 00000246 ORIGRAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f9210dabf80 RCX: 00007f9210c8c169 RDX: 000000000000ffed RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f9210ce7ca1 R08: 0000000020000540 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe135d65cf R14: 00007f9211a59300 R15: 0000000000022000
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2023-53439?
CVE-2023-53439 has a medium severity rating due to potential issues with transport header processing in the Linux kernel.
How do I fix CVE-2023-53439?
To fix CVE-2023-53439, update your Linux kernel to the latest patched version that addresses this vulnerability.
What software is affected by CVE-2023-53439?
CVE-2023-53439 affects the Linux kernel, specifically versions prior to the release that contained the fix.
What types of attacks can CVE-2023-53439 allow?
CVE-2023-53439 could potentially allow for Denial of Service (DoS) attacks or other unexpected behavior in network communication.
Is CVE-2023-53439 actively exploited?
As of now, there are no known active exploits reported for CVE-2023-53439, but updating is recommended to mitigate any risks.