Red Hat Security Advisory: kernel security update

Fixed packages 160

Vulnerabilities 2

• Medium 5.5
  CVE-2025-39925

  can: j1939: implement NETDEV_UNREGISTER notification handler

  In the Linux kernel, the following vulnerability has been resolved: can: j1939: implement NETDEV_UNREGISTER notification handler syzbot is reporting unregister_netdevice: waiting for vcan0 to become free. Usage count = 2 problem, for j1939 protocol did not ha…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Oct 1, 2025
• Unscored —
  CVE-2025-39843

  mm: slub: avoid wake up kswapd in set_track_prepare

  In the Linux kernel, the following vulnerability has been resolved: mm: slub: avoid wake up kswapd in set_track_prepare set_track_prepare() can incur lock recursion. The issue is that it is called from hrtimer_start_range_ns holding the per_cpu(hrtimer_bases)…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Sep 19, 2025

References

• article
  https://access.redhat.com/security/updates/classification/#moderate
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2396941
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2400629
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_23789.json
• report
  https://access.redhat.com/security/cve/CVE-2025-39843
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-39843
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-39843
• article
  https://lore.kernel.org/linux-cve-announce/2025091903-CVE-2025-39843-0702@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-39925
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-39925
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-39925
• article
  https://lore.kernel.org/linux-cve-announce/2025100124-CVE-2025-39925-bcec@gregkh/T