Red Hat Security Advisory: kernel security update

Fixed packages 71

Vulnerabilities 4

• Critical 9.8
  CVE-2023-53751

  cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname

  In the Linux kernel, the following vulnerability has been resolved: cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname TCP_Server_Info::hostname may be updated once or many times during reconnect, so protect its access outside reconnect path…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Dec 8, 2025
• Critical 9.8
  CVE-2025-68301

  net: atlantic: fix fragment overflow handling in RX path

  In the Linux kernel, the following vulnerability has been resolved: net: atlantic: fix fragment overflow handling in RX path The atlantic driver can receive packets with more than MAX_SKB_FRAGS (17) fragments when handling large multi-descriptor packets. This…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Dec 16, 2025
• High 7.8
  CVE-2025-40248

  vsock: Ignore signal/timeout on connect() if already established

  In the Linux kernel, the following vulnerability has been resolved: vsock: Ignore signal/timeout on connect() if already established During connect(), acting on a signal/timeout by disconnecting an already established socket leads to several issues: 1. connec…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Dec 4, 2025
• High 7.5
  CVE-2022-50865

  tcp: fix a signed-integer-overflow bug in tcp_add_backlog()

  In the Linux kernel, the following vulnerability has been resolved: tcp: fix a signed-integer-overflow bug in tcp_add_backlog() The type of sk_rcvbuf and sk_sndbuf in struct sock is int, and in tcp_add_backlog(), the variable limit is caculated by adding sk_r…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Dec 30, 2025

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2418872
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2419858
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2422836
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2426226
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_1909.json
• report
  https://access.redhat.com/security/cve/CVE-2022-50865
• advisory
  https://www.cve.org/CVERecord?id=CVE-2022-50865
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2022-50865
• article
  https://lore.kernel.org/linux-cve-announce/2025123049-CVE-2022-50865-281e@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2023-53751
• advisory
  https://www.cve.org/CVERecord?id=CVE-2023-53751
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2023-53751
• article
  https://lore.kernel.org/linux-cve-announce/2025120842-CVE-2023-53751-2ff2@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-40248
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-40248
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-40248
• article
  https://lore.kernel.org/linux-cve-announce/2025120430-CVE-2025-40248-506e@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-68301
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-68301
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-68301
• article
  https://lore.kernel.org/linux-cve-announce/2025121643-CVE-2025-68301-be31@gregkh/T