Debian: CVE-2024-50162: linux, linux-6.1 -- security update

Debian: CVE-2024-50162: linux, linux-6.1 -- security update

Severity

5

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

11/07/2024

Created

11/12/2024

Added

11/11/2024

Modified

01/30/2025

Description

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

Solution(s)

• debian-upgrade-linux
• debian-upgrade-linux-6-1

References

• https://attackerkb.com/topics/cve-2024-50162
• CVE - 2024-50162
• DLA-4008-1