CVE-2024-40961: ipv6: prevent possible NULL deref in fib6_nh_init()
First published: Fri Jul 12 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ipv6: prevent possible NULL deref in fib6_nh_init() syzbot reminds us that in6_dev_get() can return NULL. fib6_nh_init() ip6_validate_gw( &idev ) ip6_route_check_nh( idev ) *idev = in6_dev_get(dev); // can be NULL Oops: 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: 11237 Comm: syz-executor.3 Not tainted 6.10.0-rc2-syzkaller-00249-gbe27b8965297 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:fib6_nh_init+0x640/0x2160 net/ipv6/route.c:3606 Code: 00 00 fc ff df 4c 8b 64 24 58 48 8b 44 24 28 4c 8b 74 24 30 48 89 c1 48 89 44 24 28 48 8d 98 e0 05 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 b3 17 00 00 8b 1b 31 ff 89 de e8 b8 8b RSP: 0018:ffffc900032775a0 EFLAGS: 00010202 RAX: 00000000000000bc RBX: 00000000000005e0 RCX: 0000000000000000 RDX: 0000000000000010 RSI: ffffc90003277a54 RDI: ffff88802b3a08d8 RBP: ffffc900032778b0 R08: 00000000000002fc R09: 0000000000000000 R10: 00000000000002fc R11: 0000000000000000 R12: ffff88802b3a08b8 R13: 1ffff9200064eec8 R14: ffffc90003277a00 R15: dffffc0000000000 FS: 00007f940feb06c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000245e8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ip6_route_info_create+0x99e/0x12b0 net/ipv6/route.c:3809 ip6_route_add+0x28/0x160 net/ipv6/route.c:3853 ipv6_route_ioctl+0x588/0x870 net/ipv6/route.c:4483 inet6_ioctl+0x21a/0x280 net/ipv6/af_inet6.c:579 sock_do_ioctl+0x158/0x460 net/socket.c:1222 sock_ioctl+0x629/0x8e0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f940f07cea9
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=4.17<5.4.279 | |
| Linux Linux kernel | >=5.5<5.10.221 | |
| Linux Linux kernel | >=5.11<5.15.162 | |
| Linux Linux kernel | >=5.16<6.1.96 | |
| Linux Linux kernel | >=6.2<6.6.36 | |
| Linux Linux kernel | >=6.7<6.9.7 | |
| Linux Linux kernel | =6.10-rc1 | |
| Linux Linux kernel | =6.10-rc2 | |
| Linux Linux kernel | =6.10-rc3 | |
| Linux Linux kernel | =6.10-rc4 | |
| redhat/kernel | <5.4.279 | 5.4.279 |
| redhat/kernel | <5.10.221 | 5.10.221 |
| redhat/kernel | <5.15.162 | 5.15.162 |
| redhat/kernel | <6.1.96 | 6.1.96 |
| redhat/kernel | <6.6.36 | 6.6.36 |
| redhat/kernel | <6.9.7 | 6.9.7 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/2eab4543a2204092c3a7af81d7d6c506e59a03a6
- https://git.kernel.org/stable/c/3200ffeec4d59aad5bc9ca75d2c1fae47c0aeade
- https://git.kernel.org/stable/c/4cdfe813015d5a24586bd0a84fa0fa6eb0a1f668
- https://git.kernel.org/stable/c/88b9a55e2e35ea846d41f4efdc29d23345bd1aa4
- https://git.kernel.org/stable/c/ae8d3d39efe366c2198f530e01e4bf07830bf403
- https://git.kernel.org/stable/c/b6947723c9eabcab58cfb33cdb0a565a6aee6727
- https://git.kernel.org/stable/c/de5ad4d45cd0128a2a37555f48ab69aa19d78adc
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-40961
- https://nvd.nist.gov/vuln/detail/CVE-2024-40961
- https://launchpad.net/bugs/cve/CVE-2024-40961
- https://security-tracker.debian.org/tracker/CVE-2024-40961
- https://ubuntu.com/security/CVE-2024-40961
- https://git.kernel.org/linus/2eab4543a2204092c3a7af81d7d6c506e59a03a6
- https://access.redhat.com/errata/RHSA-2024:5363
- https://access.redhat.com/errata/RHSA-2024:8870
- https://access.redhat.com/errata/RHSA-2024:8856
- https://bugzilla.redhat.com/show_bug.cgi?id=2297545
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