#VU99187 Incorrect calculation in Linux kernel - CVE-2024-49988

Vulnerability identifier: #VU99187

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-49988

CWE-ID: CWE-682

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect calculation within the session_fd_check() and ksmbd_reopen_durable_fd() functions in fs/smb/server/vfs_cache.c, within the alloc_opinfo(), free_opinfo(), opinfo_get_list(), smb_send_parent_lease_break_noti(), smb_lazy_parent_lease_break_close(), smb_grant_oplock(), smb_break_all_write_oplock() and smb_break_all_levII_oplock() functions in fs/smb/server/oplock.c, within the ksmbd_conn_free() and ksmbd_conn_alloc() functions in fs/smb/server/connection.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/18f06bacc197d4ac9b518ad1c69999bc3d83e7aa
https://git.kernel.org/stable/c/9fd3cde4628bcd3549ab95061f2bab74d2ed4f3b
https://git.kernel.org/stable/c/e9dac92f4482a382e8c0fe1bc243da5fc3526b0c
https://git.kernel.org/stable/c/ee426bfb9d09b29987369b897fe9b6485ac2be27

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.