CVE-2024-38599

CVE Details

Release Date:

2024-06-19

Description

In the Linux kernel, the following vulnerability has been resolved:\njffs2: prevent xattr node from overflowing the eraseblock\nAdd a check to make sure that the requested xattr node size is no larger\nthan the eraseblock minus the cleanmarker.\nUnlike the usual inode nodes, the xattr nodes aren't split into parts\nand spread across multiple eraseblocks, which means that a xattr node\nmust not occupy more than one eraseblock. If the requested xattr value is\ntoo large, the xattr node can spill onto the next eraseblock, overwriting\nthe nodes and causing errors such as:\njffs2: argh. node added in wrong place at 0x0000b050(2)\njffs2: nextblock 0x0000a000, expected at 0000b00c\njffs2: error: (823) do_verify_xattr_datum: node CRC failed at 0x01e050,\nread=0xfc892c93, calc=0x000000\njffs2: notice: (823) jffs2_get_inode_nodes: Node header CRC failed\nat 0x01e00c. {848f,2fc4,0fef511f,59a3d171}\njffs2: Node at 0x0000000c with length 0x00001044 would run over the\nend of the erase block\njffs2: Perhaps the file system was created with the wrong erase size?\njffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found\nat 0x00000010: 0x1044 instead\nThis breaks the filesystem and can lead to KASAN crashes such as:\nBUG: KASAN: slab-out-of-bounds in jffs2_sum_add_kvec+0x125e/0x15d0\nRead of size 4 at addr ffff88802c31e914 by task repro/830\nCPU: 0 PID: 830 Comm: repro Not tainted 6.9.0-rc3+ #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996),\nBIOS Arch Linux 1.16.3-1-1 04/01/2014\nCall Trace:\n\ndump_stack_lvl+0xc6/0x120\nprint_report+0xc4/0x620\n? __virt_addr_valid+0x308/0x5b0\nkasan_report+0xc1/0xf0\n? jffs2_sum_add_kvec+0x125e/0x15d0\n? jffs2_sum_add_kvec+0x125e/0x15d0\njffs2_sum_add_kvec+0x125e/0x15d0\njffs2_flash_direct_writev+0xa8/0xd0\njffs2_flash_writev+0x9c9/0xef0\n? __x64_sys_setxattr+0xc4/0x160\n? do_syscall_64+0x69/0x140\n? entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[...]\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.

See more information about CVE-2024-38599 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)	ELSA-2024-12611	2024-09-11
Oracle Linux version 7 (kernel-uek-container)	ELSA-2024-12585	2024-08-12
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