CVE-2024-50162

CVE Details

Release Date:

2024-11-07

Description

In the Linux kernel, the following vulnerability has been resolved:\nbpf: devmap: provide rxq after redirect\nrxq contains a pointer to the device from where\nthe redirect happened. Currently, the BPF program\nthat was executed after a redirect via BPF_MAP_TYPE_DEVMAP*\ndoes not have it set.\nThis is particularly bad since accessing ingress_ifindex, e.g.\nSEC('xdp')\nint prog(struct xdp_md *pkt)\n{\nreturn bpf_redirect_map(&dev_redirect_map, 0, 0);\n}\nSEC('xdp/devmap')\nint prog_after_redirect(struct xdp_md *pkt)\n{\nbpf_printk('ifindex %i', pkt->ingress_ifindex);\nreturn XDP_PASS;\n}\ndepends on access to rxq, so a NULL pointer gets dereferenced:\n<1>[ 574.475170] BUG: kernel NULL pointer dereference, address: 0000000000000000\n<1>[ 574.475188] #PF: supervisor read access in kernel mode\n<1>[ 574.475194] #PF: error_code(0x0000) - not-present page\n<6>[ 574.475199] PGD 0 P4D 0\n<4>[ 574.475207] Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\n<4>[ 574.475217] CPU: 4 UID: 0 PID: 217 Comm: kworker/4:1 Not tainted 6.11.0-rc5-reduced-00859-g780801200300 #23\n<4>[ 574.475226] Hardware name: Intel(R) Client Systems NUC13ANHi7/NUC13ANBi7, BIOS ANRPL357.0026.2023.0314.1458 03/14/2023\n<4>[ 574.475231] Workqueue: mld mld_ifc_work\n<4>[ 574.475247] RIP: 0010:bpf_prog_5e13354d9cf5018a_prog_after_redirect+0x17/0x3c\n<4>[ 574.475257] Code: cc cc cc cc cc cc cc 80 00 00 00 cc cc cc cc cc cc cc cc f3 0f 1e fa 0f 1f 44 00 00 66 90 55 48 89 e5 f3 0f 1e fa 48 8b 57 20 <48> 8b 52 00 8b 92 e0 00 00 00 48 bf f8 a6 d5 c4 5d a0 ff ff be 0b\n<4>[ 574.475263] RSP: 0018:ffffa62440280c98 EFLAGS: 00010206\n<4>[ 574.475269] RAX: ffffa62440280cd8 RBX: 0000000000000001 RCX: 0000000000000000\n<4>[ 574.475274] RDX: 0000000000000000 RSI: ffffa62440549048 RDI: ffffa62440280ce0\n<4>[ 574.475278] RBP: ffffa62440280c98 R08: 0000000000000002 R09: 0000000000000001\n<4>[ 574.475281] R10: ffffa05dc8b98000 R11: ffffa05f577fca40 R12: ffffa05dcab24000\n<4>[ 574.475285] R13: ffffa62440280ce0 R14: ffffa62440549048 R15: ffffa62440549000\n<4>[ 574.475289] FS: 0000000000000000(0000) GS:ffffa05f4f700000(0000) knlGS:0000000000000000\n<4>[ 574.475294] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n<4>[ 574.475298] CR2: 0000000000000000 CR3: 000000025522e000 CR4: 0000000000f50ef0\n<4>[ 574.475303] PKRU: 55555554\n<4>[ 574.475306] Call Trace:\n<4>[ 574.475313] \n<4>[ 574.475318] ? __die+0x23/0x70\n<4>[ 574.475329] ? page_fault_oops+0x180/0x4c0\n<4>[ 574.475339] ? skb_pp_cow_data+0x34c/0x490\n<4>[ 574.475346] ? kmem_cache_free+0x257/0x280\n<4>[ 574.475357] ? exc_page_fault+0x67/0x150\n<4>[ 574.475368] ? asm_exc_page_fault+0x26/0x30\n<4>[ 574.475381] ? bpf_prog_5e13354d9cf5018a_prog_after_redirect+0x17/0x3c\n<4>[ 574.475386] bq_xmit_all+0x158/0x420\n<4>[ 574.475397] __dev_flush+0x30/0x90\n<4>[ 574.475407] veth_poll+0x216/0x250 [veth]\n<4>[ 574.475421] __napi_poll+0x28/0x1c0\n<4>[ 574.475430] net_rx_action+0x32d/0x3a0\n<4>[ 574.475441] handle_softirqs+0xcb/0x2c0\n<4>[ 574.475451] do_softirq+0x40/0x60\n<4>[ 574.475458] \n<4>[ 574.475461] \n<4>[ 574.475464] __local_bh_enable_ip+0x66/0x70\n<4>[ 574.475471] __dev_queue_xmit+0x268/0xe40\n<4>[ 574.475480] ? selinux_ip_postroute+0x213/0x420\n<4>[ 574.475491] ? alloc_skb_with_frags+0x4a/0x1d0\n<4>[ 574.475502] ip6_finish_output2+0x2be/0x640\n<4>[ 574.475512] ? nf_hook_slow+0x42/0xf0\n<4>[ 574.475521] ip6_finish_output+0x194/0x300\n<4>[ 574.475529] ? __pfx_ip6_finish_output+0x10/0x10\n<4>[ 574.475538] mld_sendpack+0x17c/0x240\n<4>[ 574.475548] mld_ifc_work+0x192/0x410\n<4>[ 574.475557] process_one_work+0x15d/0x380\n<4>[ 574.475566] worker_thread+0x29d/0x3a0\n<4>[ 574.475573] ? __pfx_worker_thread+0x10/0x10\n<4>[ 574.475580] ? __pfx_worker_thread+0x10/0x10\n<4>[ 574.475587] kthread+0xcd/0x100\n<4>[ 574.475597] ? __pfx_kthread+0x10/0x10\n<4>[ 574.475606] ret_from_fork+0x31/0x50\n<4>[ 574.475615] ? __pfx_kthread+0x10/0x10\n<4>[ 574.475623] ret_from_fork_asm+0x1a/0x\n---truncated---

See more information about CVE-2024-50162 from MITRE CVE dictionary and NIST NVD

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

CVSS v3 metrics

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

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12887	2024-12-18
Oracle Linux version 9 (kernel-uek)	ELSA-2024-12887	2024-12-18