Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Fixed packages 160

Vulnerabilities 4

• Critical 9.8
  CVE-2026-64564 Public exploit

  sctp: don't free the ASCONF's own transport in DEL-IP processing

  In the Linux kernel, the following vulnerability has been resolved: sctp: don't free the ASCONF's own transport in DEL-IP processing sctp_process_asconf() caches the transport the ASCONF chunk is processed against in asconf->transport (== chunk->transport, se…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Aug 4, 2026
• High 8.1
  CVE-2026-64368

  mm/slab: do not limit zeroing to orig_size when only red zoning is enabled

  In the Linux kernel, the following vulnerability has been resolved: mm/slab: do not limit zeroing to orig_size when only red zoning is enabled When init (zeroing) on allocation is requested, for kmalloc() we generally have to zero the full object size even if…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 25, 2026
• High 7.8
  CVE-2025-21826

  netfilter: nf_tables: reject mismatching sum of field_len with set key length

  In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: reject mismatching sum of field_len with set key length The field length description provides the length of each separated key field in the concatenation, each field get…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Mar 6, 2025
• High 7.8
  CVE-2026-64017

  blk-mq: pop cached request if it is usable

  In the Linux kernel, the following vulnerability has been resolved: blk-mq: pop cached request if it is usable When submitting a bio to blk-mq, if the task should sleep after peeking a cached request, but before it pops it, the plug flushes and calls blk_mq_f…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 19, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2350392
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2502449
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2507213
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2510890
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_70484.json
• report
  https://access.redhat.com/security/cve/CVE-2025-21826
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-21826
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-21826
• article
  https://lore.kernel.org/linux-cve-announce/2025030630-CVE-2025-21826-c263@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64017
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64017
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64017
• article
  https://lore.kernel.org/linux-cve-announce/2026071900-CVE-2026-64017-c8ee@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64368
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64368
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64368
• article
  https://kernelcve.org/list/?q=CVE-2026-64368
• article
  https://lore.kernel.org/linux-cve-announce/2026072522-CVE-2026-64368-014f@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64564
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64564
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64564
• article
  https://lore.kernel.org/linux-cve-announce/2026080404-CVE-2026-64564-6762@gregkh/T