CVE-2024-36901: ipv6: prevent NULL dereference in ip6_output()
In the Linux kernel, the following vulnerability has been resolved:
ipv6: prevent NULL dereference in ip6output()
According to syzbot, there is a chance that ip6dstidev() returns NULL in ip6output(). Most places in IPv6 stack deal with a NULL idev just fine, but not here.
syzbot reported:
general protection fault, probably for non-canonical address 0xdffffc00000000bc: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000005e0-0x00000000000005e7] CPU: 0 PID: 9775 Comm: syz-executor.4 Not tainted 6.9.0-rc5-syzkaller-00157-g6a30653b604a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:ip6output+0x231/0x3f0 net/ipv6/ip6output.c:237 Code: 3c 1e 00 49 89 df 74 08 4c 89 ef e8 19 58 db f7 48 8b 44 24 20 49 89 45 00 49 89 c5 48 8d 9d e0 05 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 4c 8b 74 24 28 0f 85 61 01 00 00 8b 1b 31 ff RSP: 0018:ffffc9000927f0d8 EFLAGS: 00010202 RAX: 00000000000000bc RBX: 00000000000005e0 RCX: 0000000000040000 RDX: ffffc900131f9000 RSI: 0000000000004f47 RDI: 0000000000004f48 RBP: 0000000000000000 R08: ffffffff8a1f0b9a R09: 1ffffffff1f51fad R10: dffffc0000000000 R11: fffffbfff1f51fae R12: ffff8880293ec8c0 R13: ffff88805d7fc000 R14: 1ffff1100527d91a R15: dffffc0000000000 FS: 00007f135c6856c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000080 CR3: 0000000064096000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> NFHOOK include/linux/netfilter.h:314 [inline] ip6xmit+0xefe/0x17f0 net/ipv6/ip6output.c:358 sctpv6xmit+0x9f2/0x13f0 net/sctp/ipv6.c:248 sctppackettransmit+0x26ad/0x2ca0 net/sctp/output.c:653 sctppacketsingleton+0x22c/0x320 net/sctp/outqueue.c:783 sctpoutqflushctrl net/sctp/outqueue.c:914 [inline] sctpoutqflush+0x6d5/0x3e20 net/sctp/outqueue.c:1212 sctpsideeffects net/sctp/smsideeffect.c:1198 [inline] sctpdosm+0x59cc/0x60c0 net/sctp/smsideeffect.c:1169 sctpprimitiveASSOCIATE+0x95/0xc0 net/sctp/primitive.c:73 sctpconnect+0x9cd/0xe30 net/sctp/socket.c:1234 sctpconnect net/sctp/socket.c:4819 [inline] sctpinetconnect+0x149/0x1f0 net/sctp/socket.c:4834 sysconnectfile net/socket.c:2048 [inline] sysconnect+0x2df/0x310 net/socket.c:2065 dosysconnect net/socket.c:2075 [inline] sesysconnect net/socket.c:2072 [inline] x64sysconnect+0x7a/0x90 net/socket.c:2072 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xf5/0x240 arch/x86/entry/common.c:83 entrySYSCALL64afterhwframe+0x77/0x7f
Other sources
In the Linux kernel, the following vulnerability has been resolved:
ipv6: prevent NULL dereference in ip6output()
The Linux kernel CVE team has assigned CVE-2024-36901 to this issue.
Upstream advisory: https://lore.kernel.org/linux-cve-announce/2024053035-CVE-2024-36901-fb16@gregkh/T
— Red Hat
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-36901?
CVE-2024-36901 has a high severity due to the potential for a NULL dereference in the ip6_output() function of the Linux kernel.
How do I fix CVE-2024-36901?
To fix CVE-2024-36901, update the Linux kernel to versions 6.1.91, 6.6.31, 6.8.10, or 6.9, as well as specific Debian versions.
Which Linux kernel versions are affected by CVE-2024-36901?
CVE-2024-36901 affects Linux kernel versions prior to 6.1.91, 6.6.31, 6.8.10, and 6.9.
Is there a known exploit for CVE-2024-36901?
As of now, there are no publicly known exploits for CVE-2024-36901, but it is recommended to patch the vulnerability to prevent potential attacks.
What impacts does CVE-2024-36901 have on system security?
CVE-2024-36901 can lead to instability or crashes in systems using the affected versions of the Linux kernel, resulting in potential denial of service.