CVE-2024-26615

CVE Details

Release Date:

2024-02-29

Description

In the Linux kernel, the following vulnerability has been resolved:\nnet/smc: fix illegal rmb_desc access in SMC-D connection dump\nA crash was found when dumping SMC-D connections. It can be reproduced\nby following steps:\n- run nginx/wrk test:\nsmc_run nginx\nsmc_run wrk -t 16 -c 1000 -d -H 'Connection: Close' \n- continuously dump SMC-D connections in parallel:\nwatch -n 1 'smcss -D'\nBUG: kernel NULL pointer dereference, address: 0000000000000030\nCPU: 2 PID: 7204 Comm: smcss Kdump: loaded Tainted: GE 6.7.0+ #55\nRIP: 0010:__smc_diag_dump.constprop.0+0x5e5/0x620 [smc_diag]\nCall Trace:\n\n? __die+0x24/0x70\n? page_fault_oops+0x66/0x150\n? exc_page_fault+0x69/0x140\n? asm_exc_page_fault+0x26/0x30\n? __smc_diag_dump.constprop.0+0x5e5/0x620 [smc_diag]\n? __kmalloc_node_track_caller+0x35d/0x430\n? __alloc_skb+0x77/0x170\nsmc_diag_dump_proto+0xd0/0xf0 [smc_diag]\nsmc_diag_dump+0x26/0x60 [smc_diag]\nnetlink_dump+0x19f/0x320\n__netlink_dump_start+0x1dc/0x300\nsmc_diag_handler_dump+0x6a/0x80 [smc_diag]\n? __pfx_smc_diag_dump+0x10/0x10 [smc_diag]\nsock_diag_rcv_msg+0x121/0x140\n? __pfx_sock_diag_rcv_msg+0x10/0x10\nnetlink_rcv_skb+0x5a/0x110\nsock_diag_rcv+0x28/0x40\nnetlink_unicast+0x22a/0x330\nnetlink_sendmsg+0x1f8/0x420\n__sock_sendmsg+0xb0/0xc0\n____sys_sendmsg+0x24e/0x300\n? copy_msghdr_from_user+0x62/0x80\n___sys_sendmsg+0x7c/0xd0\n? __do_fault+0x34/0x160\n? do_read_fault+0x5f/0x100\n? do_fault+0xb0/0x110\n? __handle_mm_fault+0x2b0/0x6c0\n__sys_sendmsg+0x4d/0x80\ndo_syscall_64+0x69/0x180\nentry_SYSCALL_64_after_hwframe+0x6e/0x76\nIt is possible that the connection is in process of being established\nwhen we dump it. Assumed that the connection has been registered in a\nlink group by smc_conn_create() but the rmb_desc has not yet been\ninitialized by smc_buf_create(), thus causing the illegal access to\nconn->rmb_desc. So fix it by checking before dump.

See more information about CVE-2024-26615 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)	ELSA-2024-3618	2024-06-05
Oracle Linux version 9 (kernel)	ELSA-2024-10939	2024-12-11