Red Hat Security Advisory: kernel security update

Fixed packages 160

Vulnerabilities 3

• 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-2025-21863

  io_uring: prevent opcode speculation

  In the Linux kernel, the following vulnerability has been resolved: io_uring: prevent opcode speculation sqe->opcode is used for different tables, make sure we santitise it against speculations.

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Mar 12, 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

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2351629
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2418872
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2422836
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_1703.json
• report
  https://access.redhat.com/security/cve/CVE-2025-21863
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-21863
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-21863
• article
  https://lore.kernel.org/linux-cve-announce/2025031217-CVE-2025-21863-a73a@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