RHSA-2026:0533 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: smb: client: Fix use-after-free in cifs_fill_dirent (CVE-2025-38051)
• kernel: smb: client: fix race with concurrent opens in rename(2) (CVE-2025-39825)
• kernel: efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare (CVE-2025-39817)
• kernel: mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required() (CVE-2023-53401)
• kernel: mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory (CVE-2025-39883)
• kernel: e1000e: fix heap overflow in e1000_set_eeprom (CVE-2025-39898)
• kernel: nbd: fix incomplete validation of ioctl arg (CVE-2023-53513)
• kernel: NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL (CVE-2023-53680)
• kernel: scsi: ses: Fix possible desc_ptr out-of-bounds accesses (CVE-2023-53675)
• kernel: media: rc: fix races with imon_disconnect() (CVE-2025-39993)
• kernel: ipv6: Fix out-of-bounds access in ipv6_find_tlv() (CVE-2023-53705)
• kernel: libceph: fix potential use-after-free in have_mon_and_osd_map() (CVE-2025-68285)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2373329 - CVE-2025-38051 kernel: smb: client: Fix use-after-free in cifs_fill_dirent
• BZ - 2395792 - CVE-2025-39825 kernel: smb: client: fix race with concurrent opens in rename(2)
• BZ - 2395805 - CVE-2025-39817 kernel: efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare
• BZ - 2396417 - CVE-2023-53401 kernel: mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required()
• BZ - 2397553 - CVE-2025-39883 kernel: mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory
• BZ - 2400598 - CVE-2025-39898 kernel: e1000e: fix heap overflow in e1000_set_eeprom
• BZ - 2400795 - CVE-2023-53513 kernel: nbd: fix incomplete validation of ioctl arg
• BZ - 2402213 - CVE-2023-53680 kernel: NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL
• BZ - 2402293 - CVE-2023-53675 kernel: scsi: ses: Fix possible desc_ptr out-of-bounds accesses
• BZ - 2404121 - CVE-2025-39993 kernel: media: rc: fix races with imon_disconnect()
• BZ - 2405713 - CVE-2023-53705 kernel: ipv6: Fix out-of-bounds access in ipv6_find_tlv()
• BZ - 2422801 - CVE-2025-68285 kernel: libceph: fix potential use-after-free in have_mon_and_osd_map()

CVEs

• CVE-2023-53401
• CVE-2023-53513
• CVE-2023-53675
• CVE-2023-53680
• CVE-2023-53705
• CVE-2025-38051
• CVE-2025-39817
• CVE-2025-39825
• CVE-2025-39883
• CVE-2025-39898
• CVE-2025-39993
• CVE-2025-68285

References

• https://access.redhat.com/security/updates/classification/#important