Red Hat Security Advisory: kernel security update

Fixed packages 49

Vulnerabilities 4

• High 7.8
  CVE-2025-21759

  ipv6: mcast: extend RCU protection in igmp6_send()

  In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: extend RCU protection in igmp6_send() igmp6_send() can be called without RTNL or RCU being held. Extend RCU protection so that we can safely fetch the net pointer and avoid a pot…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Feb 27, 2025
• High 7.8
  CVE-2025-38085

  mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race

  In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race huge_pmd_unshare() drops a reference on a page table that may have previously been shared across processes, potentially turning it into a n…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jun 28, 2025
• High 7.8
  CVE-2025-38250

  Bluetooth: hci_core: Fix use-after-free in vhci_flush()

  In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Fix use-after-free in vhci_flush() syzbot reported use-after-free in vhci_flush() without repro. [0] From the splat, a thread close()d a vhci file descriptor while its de…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 9, 2025
• High 7.8
  CVE-2025-38464

  tipc: Fix use-after-free in tipc_conn_close().

  In the Linux kernel, the following vulnerability has been resolved: tipc: Fix use-after-free in tipc_conn_close(). syzbot reported a null-ptr-deref in tipc_conn_close() during netns dismantle. [0] tipc_topsrv_stop() iterates tipc_net(net)->topsrv->conn_idr an…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 25, 2025

References

• article
  https://access.redhat.com/security/updates/classification/#moderate
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2348596
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2375304
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2378982
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2383509
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_14985.json
• report
  https://access.redhat.com/security/cve/CVE-2025-21759
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-21759
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-21759
• article
  https://kernelcve.org/list/?q=CVE-2025-21759
• article
  https://lore.kernel.org/linux-cve-announce/2025022604-CVE-2025-21759-ad7c@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-38085
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-38085
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-38085
• article
  https://lore.kernel.org/linux-cve-announce/2025062836-CVE-2025-38085-8075@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-38250
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-38250
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-38250
• article
  https://lore.kernel.org/linux-cve-announce/2025070934-CVE-2025-38250-3145@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-38464
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-38464
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-38464
• article
  https://lore.kernel.org/linux-cve-announce/2025072508-CVE-2025-38464-44a1@gregkh/T