SB2025120135 - Red Hat Enterprise Linux 9 update for kernel
Published: December 1, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 secuirty vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2025-38724)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the nfsd4_setclientid_confirm() function in fs/nfsd/nfs4state.c. A local user can escalate privileges on the system.
2) Use-after-free (CVE-ID: CVE-2025-39864)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the cfg80211_update_known_bss() function in net/wireless/scan.c. A local user can escalate privileges on the system.
3) Improper error handling (CVE-ID: CVE-2025-39883)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper error handling within the unpoison_memory() function in mm/memory-failure.c. A local user can perform a denial of service (DoS) attack.
4) Use-after-free (CVE-ID: CVE-2025-39881)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the of_on(), kernfs_seq_stop_active(), kernfs_seq_start(), kernfs_file_read_iter(), kernfs_fop_write_iter(), kernfs_vma_open(), kernfs_vma_fault(), kernfs_vma_page_mkwrite(), kernfs_vma_access(), kernfs_fop_mmap() and kernfs_fop_poll() functions in fs/kernfs/file.c. A local user can escalate privileges on the system.
5) Buffer overflow (CVE-ID: CVE-2025-39918)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to memory corruption within the mt76_txq_schedule_pending_wcid() and mt76_txq_schedule_pending() functions in drivers/net/wireless/mediatek/mt76/tx.c. A local user can perform a denial of service (DoS) attack.
6) Resource management error (CVE-ID: CVE-2025-39955)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to resource management error within the tcp_disconnect() function in net/ipv4/tcp.c. A local user can perform a denial of service (DoS) attack.
7) Use-after-free (CVE-ID: CVE-2025-40186)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the tcp_conn_request() function in net/ipv4/tcp_input.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.