CVE-2024-36902

CVE Details

Release Date:

2024-05-30

Description

In the Linux kernel, the following vulnerability has been resolved:\nipv6: fib6_rules: avoid possible NULL dereference in fib6_rule_action()\nsyzbot is able to trigger the following crash [1],\ncaused by unsafe ip6_dst_idev() use.\nIndeed ip6_dst_idev() can return NULL, and must always be checked.\n[1]\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nCPU: 0 PID: 31648 Comm: syz-executor.0 Not tainted 6.9.0-rc4-next-20240417-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nRIP: 0010:__fib6_rule_action net/ipv6/fib6_rules.c:237 [inline]\nRIP: 0010:fib6_rule_action+0x241/0x7b0 net/ipv6/fib6_rules.c:267\nCode: 02 00 00 49 8d 9f d8 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 f9 32 bf f7 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 e0 32 bf f7 4c 8b 03 48 89 ef 4c\nRSP: 0018:ffffc9000fc1f2f0 EFLAGS: 00010246\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: 1a772f98c8186700\nRDX: 0000000000000003 RSI: ffffffff8bcac4e0 RDI: ffffffff8c1f9760\nRBP: ffff8880673fb980 R08: ffffffff8fac15ef R09: 1ffffffff1f582bd\nR10: dffffc0000000000 R11: fffffbfff1f582be R12: dffffc0000000000\nR13: 0000000000000080 R14: ffff888076509000 R15: ffff88807a029a00\nFS: 00007f55e82ca6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000001b31d23000 CR3: 0000000022b66000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n\nfib_rules_lookup+0x62c/0xdb0 net/core/fib_rules.c:317\nfib6_rule_lookup+0x1fd/0x790 net/ipv6/fib6_rules.c:108\nip6_route_output_flags_noref net/ipv6/route.c:2637 [inline]\nip6_route_output_flags+0x38e/0x610 net/ipv6/route.c:2649\nip6_route_output include/net/ip6_route.h:93 [inline]\nip6_dst_lookup_tail+0x189/0x11a0 net/ipv6/ip6_output.c:1120\nip6_dst_lookup_flow+0xb9/0x180 net/ipv6/ip6_output.c:1250\nsctp_v6_get_dst+0x792/0x1e20 net/sctp/ipv6.c:326\nsctp_transport_route+0x12c/0x2e0 net/sctp/transport.c:455\nsctp_assoc_add_peer+0x614/0x15c0 net/sctp/associola.c:662\nsctp_connect_new_asoc+0x31d/0x6c0 net/sctp/socket.c:1099\n__sctp_connect+0x66d/0xe30 net/sctp/socket.c:1197\nsctp_connect net/sctp/socket.c:4819 [inline]\nsctp_inet_connect+0x149/0x1f0 net/sctp/socket.c:4834\n__sys_connect_file net/socket.c:2048 [inline]\n__sys_connect+0x2df/0x310 net/socket.c:2065\n__do_sys_connect net/socket.c:2075 [inline]\n__se_sys_connect net/socket.c:2072 [inline]\n__x64_sys_connect+0x7a/0x90 net/socket.c:2072\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f

See more information about CVE-2024-36902 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	5.5	CVSS Vector:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Local network	Attack Complexity:	Low
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (kernel)	ELSA-2024-7000	2024-09-24
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14