CVE-2024-38598

CVE Details

Release Date:

2024-06-19

Description

In the Linux kernel, the following vulnerability has been resolved:\nmd: fix resync softlockup when bitmap size is less than array size\nIs is reported that for dm-raid10, lvextend + lvchange --syncaction will\ntrigger following softlockup:\nkernel:watchdog: BUG: soft lockup - CPU#3 stuck for 26s! [mdX_resync:6976]\nCPU: 7 PID: 3588 Comm: mdX_resync Kdump: loaded Not tainted 6.9.0-rc4-next-20240419 #1\nRIP: 0010:_raw_spin_unlock_irq+0x13/0x30\nCall Trace:\n\nmd_bitmap_start_sync+0x6b/0xf0\nraid10_sync_request+0x25c/0x1b40 [raid10]\nmd_do_sync+0x64b/0x1020\nmd_thread+0xa7/0x170\nkthread+0xcf/0x100\nret_from_fork+0x30/0x50\nret_from_fork_asm+0x1a/0x30\nAnd the detailed process is as follows:\nmd_do_sync\nj = mddev->resync_min\nwhile (j < max_sectors)\nsectors = raid10_sync_request(mddev, j, &skipped)\nif (!md_bitmap_start_sync(..., &sync_blocks))\n// md_bitmap_start_sync set sync_blocks to 0\nreturn sync_blocks + sectors_skippe;\n// sectors = 0;\nj += sectors;\n// j never change\nRoot cause is that commit 301867b1c168 ('md/raid10: check\nslab-out-of-bounds in md_bitmap_get_counter') return early from\nmd_bitmap_get_counter(), without setting returned blocks.\nFix this problem by always set returned blocks from\nmd_bitmap_get_counter'(), as it used to be.\nNoted that this patch just fix the softlockup problem in kernel, the\ncase that bitmap size doesn't match array size still need to be fixed.

See more information about CVE-2024-38598 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 7 (kernel-uek)	ELSA-2024-12581	2024-08-12
Oracle Linux version 7 (kernel-uek-container)	ELSA-2024-12585	2024-08-12
Oracle Linux version 8 (kernel)	ELSA-2024-5101	2024-08-08
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12581	2024-08-12
Oracle Linux version 8 (kernel-uek-container)	ELSA-2024-12584	2024-08-12