CVE-2024-50151

CVE Details

Release Date:

2024-11-07

Description

In the Linux kernel, the following vulnerability has been resolved:\nsmb: client: fix OOBs when building SMB2_IOCTL request\nWhen using encryption, either enforced by the server or when using\n'seal' mount option, the client will squash all compound request buffers\ndown for encryption into a single iov in smb2_set_next_command().\nSMB2_ioctl_init() allocates a small buffer (448 bytes) to hold the\nSMB2_IOCTL request in the first iov, and if the user passes an input\nbuffer that is greater than 328 bytes, smb2_set_next_command() will\nend up writing off the end of @rqst->iov[0].iov_base as shown below:\nmount.cifs //srv/share /mnt -o ...,seal\nln -s /mnt/link\nBUG: KASAN: slab-out-of-bounds in\nsmb2_set_next_command.cold+0x1d6/0x24c [cifs]\nWrite of size 4116 at addr ffff8881148fcab8 by task ln/859\nCPU: 1 UID: 0 PID: 859 Comm: ln Not tainted 6.12.0-rc3 #1\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\n1.16.3-2.fc40 04/01/2014\nCall Trace:\n\ndump_stack_lvl+0x5d/0x80\n? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\nprint_report+0x156/0x4d9\n? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n? __virt_addr_valid+0x145/0x310\n? __phys_addr+0x46/0x90\n? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\nkasan_report+0xda/0x110\n? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\nkasan_check_range+0x10f/0x1f0\n__asan_memcpy+0x3c/0x60\nsmb2_set_next_command.cold+0x1d6/0x24c [cifs]\nsmb2_compound_op+0x238c/0x3840 [cifs]\n? kasan_save_track+0x14/0x30\n? kasan_save_free_info+0x3b/0x70\n? vfs_symlink+0x1a1/0x2c0\n? do_symlinkat+0x108/0x1c0\n? __pfx_smb2_compound_op+0x10/0x10 [cifs]\n? kmem_cache_free+0x118/0x3e0\n? cifs_get_writable_path+0xeb/0x1a0 [cifs]\nsmb2_get_reparse_inode+0x423/0x540 [cifs]\n? __pfx_smb2_get_reparse_inode+0x10/0x10 [cifs]\n? rcu_is_watching+0x20/0x50\n? __kmalloc_noprof+0x37c/0x480\n? smb2_create_reparse_symlink+0x257/0x490 [cifs]\n? smb2_create_reparse_symlink+0x38f/0x490 [cifs]\nsmb2_create_reparse_symlink+0x38f/0x490 [cifs]\n? __pfx_smb2_create_reparse_symlink+0x10/0x10 [cifs]\n? find_held_lock+0x8a/0xa0\n? hlock_class+0x32/0xb0\n? __build_path_from_dentry_optional_prefix+0x19d/0x2e0 [cifs]\ncifs_symlink+0x24f/0x960 [cifs]\n? __pfx_make_vfsuid+0x10/0x10\n? __pfx_cifs_symlink+0x10/0x10 [cifs]\n? make_vfsgid+0x6b/0xc0\n? generic_permission+0x96/0x2d0\nvfs_symlink+0x1a1/0x2c0\ndo_symlinkat+0x108/0x1c0\n? __pfx_do_symlinkat+0x10/0x10\n? strncpy_from_user+0xaa/0x160\n__x64_sys_symlinkat+0xb9/0xf0\ndo_syscall_64+0xbb/0x1d0\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f08d75c13bb

See more information about CVE-2024-50151 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:	7.8
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality:	High
Integrity:	High
Availability:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (kernel-uek)	ELSA-2024-12884	2024-12-16
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12884	2024-12-16
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12887	2024-12-18
Oracle Linux version 9 (kernel-uek)	ELSA-2024-12887	2024-12-18