Red Hat Security Advisory: kernel security update

Fixed packages 142

Vulnerabilities 9

• Critical 9.8
  CVE-2025-68741

  scsi: qla2xxx: Fix improper freeing of purex item

  In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix improper freeing of purex item In qla2xxx_process_purls_iocb(), an item is allocated via qla27xx_copy_multiple_pkt(), which internally calls qla24xx_alloc_purex_item(). The…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Dec 24, 2025
• High 7.8
  CVE-2025-21999

  proc: fix UAF in proc_get_inode()

  In the Linux kernel, the following vulnerability has been resolved: proc: fix UAF in proc_get_inode() Fix race between rmmod and /proc/XXX's inode instantiation. The bug is that pde->proc_ops don't belong to /proc, it belongs to a module, therefore dereferenc…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Apr 3, 2025
• High 7.8
  CVE-2025-38653

  proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al

  In the Linux kernel, the following vulnerability has been resolved: proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al Check pde->proc_ops->proc_lseek directly may cause UAF in rmmod scenario. It's a gap in proc_reg_open() after…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Aug 22, 2025
• High 7.8
  CVE-2026-23243

  RDMA/umad: Reject negative data_len in ib_umad_write

  In the Linux kernel, the following vulnerability has been resolved: RDMA/umad: Reject negative data_len in ib_umad_write ib_umad_write computes data_len from user-controlled count and the MAD header sizes. With a mismatched user MAD header size and RMPP heade…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Mar 18, 2026
• High 7.8
  CVE-2026-23270

  net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks

  In the Linux kernel, the following vulnerability has been resolved: net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks As Paolo said earlier [1]: "Since the blamed commit below, classify can return TC_ACT_CONSUMED while the curren…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Mar 18, 2026
• High 7.8
  CVE-2026-31419

  net: bonding: fix use-after-free in bond_xmit_broadcast()

  In the Linux kernel, the following vulnerability has been resolved: net: bonding: fix use-after-free in bond_xmit_broadcast() bond_xmit_broadcast() reuses the original skb for the last slave (determined by bond_is_last_slave()) and clones it for others. Concu…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Apr 13, 2026
• Unscored —
  CVE-2025-39766

  net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit

  In the Linux kernel, the following vulnerability has been resolved: net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit The following setup can trigger a WARNING in htb_activate due to the condition: !cl->leaf.q->q.qlen tc qdisc del dev lo …

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Sep 11, 2025
• Unscored —
  CVE-2025-68366

  nbd: defer config unlock in nbd_genl_connect

  In the Linux kernel, the following vulnerability has been resolved: nbd: defer config unlock in nbd_genl_connect There is one use-after-free warning when running NBD_CMD_CONNECT and NBD_CLEAR_SOCK: nbd_genl_connect nbd_alloc_and_init_config // config_refs=1 n…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Dec 24, 2025
• Unscored —
  CVE-2026-43163

  md/bitmap: fix GPF in write_page caused by resize race

  In the Linux kernel, the following vulnerability has been resolved: md/bitmap: fix GPF in write_page caused by resize race A General Protection Fault occurs in write_page() during array resize: RIP: 0010:write_page+0x22b/0x3c0 [md_mod] This is a use-after-fre…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  May 6, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2357134
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2390372
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2394648
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2424881
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2425046
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2448594
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2448745
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2457829
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2467059
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_21209.json
• report
  https://access.redhat.com/security/cve/CVE-2025-21999
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-21999
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-21999
• article
  https://lore.kernel.org/linux-cve-announce/2025040348-CVE-2025-21999-bc57@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-38653
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-38653
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-38653
• article
  https://lore.kernel.org/linux-cve-announce/2025082238-CVE-2025-38653-35ba@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-39766
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-39766
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-39766
• article
  https://lore.kernel.org/linux-cve-announce/2025091144-CVE-2025-39766-7465@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-68366
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-68366
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-68366
• article
  https://lore.kernel.org/linux-cve-announce/2025122459-CVE-2025-68366-b367@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-68741
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-68741
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-68741
• article
  https://lore.kernel.org/linux-cve-announce/2025122415-CVE-2025-68741-894a@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-23243
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-23243
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-23243
• article
  https://lore.kernel.org/linux-cve-announce/2026031816-CVE-2026-23243-b88e@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-23270
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-23270
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-23270
• article
  https://lore.kernel.org/linux-cve-announce/2026031847-CVE-2026-23270-cb9a@gregkh/T