CVE-2024-26611

CVE Details

Release Date:

2024-02-29

Description

In the Linux kernel, the following vulnerability has been resolved:\nxsk: fix usage of multi-buffer BPF helpers for ZC XDP\nCurrently when packet is shrunk via bpf_xdp_adjust_tail() and memory\ntype is set to MEM_TYPE_XSK_BUFF_POOL, null ptr dereference happens:\n[1136314.192256] BUG: kernel NULL pointer dereference, address:\n0000000000000034\n[1136314.203943] #PF: supervisor read access in kernel mode\n[1136314.213768] #PF: error_code(0x0000) - not-present page\n[1136314.223550] PGD 0 P4D 0\n[1136314.230684] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[1136314.239621] CPU: 8 PID: 54203 Comm: xdpsock Not tainted 6.6.0+ #257\n[1136314.250469] Hardware name: Intel Corporation S2600WFT/S2600WFT,\nBIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[1136314.265615] RIP: 0010:__xdp_return+0x6c/0x210\n[1136314.274653] Code: ad 00 48 8b 47 08 49 89 f8 a8 01 0f 85 9b 01 00 00 0f 1f 44 00 00 f0 41 ff 48 34 75 32 4c 89 c7 e9 79 cd 80 ff 83 fe 03 75 17 41 34 01 0f 85 02 01 00 00 48 89 cf e9 22 cc 1e 00 e9 3d d2 86\n[1136314.302907] RSP: 0018:ffffc900089f8db0 EFLAGS: 00010246\n[1136314.312967] RAX: ffffc9003168aed0 RBX: ffff8881c3300000 RCX:\n0000000000000000\n[1136314.324953] RDX: 0000000000000000 RSI: 0000000000000003 RDI:\nffffc9003168c000\n[1136314.336929] RBP: 0000000000000ae0 R08: 0000000000000002 R09:\n0000000000010000\n[1136314.348844] R10: ffffc9000e495000 R11: 0000000000000040 R12:\n0000000000000001\n[1136314.360706] R13: 0000000000000524 R14: ffffc9003168aec0 R15:\n0000000000000001\n[1136314.373298] FS: 00007f8df8bbcb80(0000) GS:ffff8897e0e00000(0000)\nknlGS:0000000000000000\n[1136314.386105] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[1136314.396532] CR2: 0000000000000034 CR3: 00000001aa912002 CR4:\n00000000007706f0\n[1136314.408377] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\n0000000000000000\n[1136314.420173] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\n0000000000000400\n[1136314.431890] PKRU: 55555554\n[1136314.439143] Call Trace:\n[1136314.446058] \n[1136314.452465] ? __die+0x20/0x70\n[1136314.459881] ? page_fault_oops+0x15b/0x440\n[1136314.468305] ? exc_page_fault+0x6a/0x150\n[1136314.476491] ? asm_exc_page_fault+0x22/0x30\n[1136314.484927] ? __xdp_return+0x6c/0x210\n[1136314.492863] bpf_xdp_adjust_tail+0x155/0x1d0\n[1136314.501269] bpf_prog_ccc47ae29d3b6570_xdp_sock_prog+0x15/0x60\n[1136314.511263] ice_clean_rx_irq_zc+0x206/0xc60 [ice]\n[1136314.520222] ? ice_xmit_zc+0x6e/0x150 [ice]\n[1136314.528506] ice_napi_poll+0x467/0x670 [ice]\n[1136314.536858] ? ttwu_do_activate.constprop.0+0x8f/0x1a0\n[1136314.546010] __napi_poll+0x29/0x1b0\n[1136314.553462] net_rx_action+0x133/0x270\n[1136314.561619] __do_softirq+0xbe/0x28e\n[1136314.569303] do_softirq+0x3f/0x60\nThis comes from __xdp_return() call with xdp_buff argument passed as\nNULL which is supposed to be consumed by xsk_buff_free() call.\nTo address this properly, in ZC case, a node that represents the frag\nbeing removed has to be pulled out of xskb_list. Introduce\nappropriate xsk helpers to do such node operation and use them\naccordingly within bpf_xdp_adjust_tail().

See more information about CVE-2024-26611 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:	2.3	CVSS Vector:	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
Attack Vector:	Local network	Attack Complexity:	Low
Privileges Required:	High	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	Low

Errata information

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