Red Hat Security Advisory: kernel security update

Fixed packages 160

Vulnerabilities 13

• Critical 9.8
  CVE-2026-31607

  usbip: validate number_of_packets in usbip_pack_ret_submit()

  In the Linux kernel, the following vulnerability has been resolved: usbip: validate number_of_packets in usbip_pack_ret_submit() When a USB/IP client receives a RET_SUBMIT response, usbip_pack_ret_submit() unconditionally overwrites urb->number_of_packets fro…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Apr 24, 2026
• Critical 9.8
  CVE-2026-43037

  ip6_tunnel: clear skb2->cb[] in ip4ip6_err()

  In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() Oskar Kjos reported the following problem. ip4ip6_err() calls icmp_send() on a cloned skb whose cb[] was written by the IPv6 receive path as struc…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  May 1, 2026
• Critical 9.8
  CVE-2026-43038

  ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()

  In the Linux kernel, the following vulnerability has been resolved: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() Sashiko AI-review observed: In ip6_err_gen_icmpv6_unreach(), the skb is an outer IPv4 ICMP error packet where its cb contains an I…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  May 1, 2026
• Critical 9.4
  CVE-2026-31685

  netfilter: ip6t_eui64: reject invalid MAC header for all packets

  In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_eui64: reject invalid MAC header for all packets `eui64_mt6()` derives a modified EUI-64 from the Ethernet source address and compares it with the low 64 bits of the IPv6 sour…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Apr 25, 2026
• High 8.8
  CVE-2026-31709

  smb: client: validate the whole DACL before rewriting it in cifsacl

  In the Linux kernel, the following vulnerability has been resolved: smb: client: validate the whole DACL before rewriting it in cifsacl build_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a server-supplied dacloffset and then use the incomin…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  May 1, 2026
• 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-2026-23270

  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-2026-23392

  netfilter: nf_tables: release flowtable after rcu grace period on error

  In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a hook that already refers to this flowtabl…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Mar 25, 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-2026-23210

  ice: Fix PTP NULL pointer dereference during VSI rebuild

  In the Linux kernel, the following vulnerability has been resolved: ice: Fix PTP NULL pointer dereference during VSI rebuild Fix race condition where PTP periodic work runs while VSI is being rebuilt, accessing NULL vsi->rx_rings. The sequence was: 1. ice_ptp…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Feb 14, 2026
• 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=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=2439895
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2448745
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2451218
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2457829
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2461521
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2461759
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2464351
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2464397
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2464476
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2467059
• article
  https://issues.redhat.com/browse/RHEL-174822
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_23224.json
• 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-2026-23210
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-23210
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-23210
• article
  https://lore.kernel.org/linux-cve-announce/2026021439-CVE-2026-23210-7cac@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
• report
  https://access.redhat.com/security/cve/CVE-2026-23392
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-23392
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-23392