Red Hat Security Advisory: kernel security update

Fixed packages 81

Vulnerabilities 3

• High 8.1
  CVE-2025-40186

  tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request().

  In the Linux kernel, the following vulnerability has been resolved: tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). syzbot reported the splat below in tcp_conn_request(). [0] If a listener is close()d while a TFO socket is being processed in tc…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Nov 12, 2025
• High 7.8
  CVE-2025-39825

  smb: client: fix race with concurrent opens in rename(2)

  In the Linux kernel, the following vulnerability has been resolved: smb: client: fix race with concurrent opens in rename(2) Besides sending the rename request to the server, the rename process also involves closing any deferred close, waiting for outstanding…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Sep 16, 2025
• Unscored —
  CVE-2025-39955

  tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect().

  In the Linux kernel, the following vulnerability has been resolved: tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect(). syzbot reported the splat below where a socket had tcp_sk(sk)->fastopen_rsk in the TCP_ESTABLISHED state. [0] syzbot reused the server…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Oct 9, 2025

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2395792
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2402699
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2414724
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_23425.json
• report
  https://access.redhat.com/security/cve/CVE-2025-39825
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-39825
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-39825
• article
  https://lore.kernel.org/linux-cve-announce/2025091616-CVE-2025-39825-8a7a@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-39955
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-39955
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-39955
• article
  https://lore.kernel.org/linux-cve-announce/2025100942-CVE-2025-39955-f36b@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-40186
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-40186
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-40186
• article
  https://lore.kernel.org/linux-cve-announce/2025111244-CVE-2025-40186-b204@gregkh/T