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OpenAdvisories
Critical RHSA-2026:83159 9 CVEs

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

Published Oct 15, 2026 · Updated Nov 13, 2026

Ecosystem: Red Hat

Fixed packages 28

ReleasePackageFixed in
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-core 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-core 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-debuginfo 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-devel 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-kvm 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-modules 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-modules-extra 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debuginfo 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debuginfo-common-x86_64 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-devel 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-kvm 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-modules 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-modules-extra 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-core 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-core 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-debuginfo 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-devel 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-modules 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-modules-extra 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debuginfo 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debuginfo-common-x86_64 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-devel 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-modules 0:4.18.0-553.174.1.rt7.515.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-modules-extra 0:4.18.0-553.174.1.rt7.515.el8_10

Vulnerabilities 9

  • Critical 10.0
    CVE-2026-74705

    udp: fix potential use-after-free in tunnel segmentation

    In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Critical 9.8
    CVE-2026-89526

    svcrdma: Validate Read chunk positions before reconstruction

    In the Linux kernel, the following vulnerability has been resolved: svcrdma: Validate Read chunk positions before reconstruction The RPC/RDMA Read chunk position field is supplied by the remote client and stored verbatim in the parsed chunk list. xdr_count_re…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Critical 9.8
    CVE-2026-90036

    NFSD: Prevent client use-after-free during blocked-lock reaping

    In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent client use-after-free during blocked-lock reaping A bare lock owner -- its only remaining reference a blocked lock on nn->blocked_locks_lru -- holds a raw pointer to its nfs4_cl…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Critical 9.1
    CVE-2026-93228

    svcrdma: Reject Write/Reply chunks with segcount 0

    In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject Write/Reply chunks with segcount 0 A peer can send a Write or Reply chunk whose segcount field is zero. xdr_check_write_chunk() only rejects segcount > rc_maxpages, so zero pa…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-68377

    net/sched: act_tunnel_key: Defer dst_release to RCU callback

    In the Linux kernel, the following vulnerability has been resolved: net/sched: act_tunnel_key: Defer dst_release to RCU callback Fix a race-condition use-after-free in tunnel_key_release_params(). The function releases the metadata_dst of the old params synch…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2026-72262

    ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get

    In the Linux kernel, the following vulnerability has been resolved: ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get The ipc_control_data buffer is allocated as kzalloc(max_size), where max_size covers the entire struct sof_ipc_ctrl_data includ…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2026-74583 Public exploit

    net/sched: cls_route: fix fastmap use-after-free on filter

    In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_route: fix fastmap use-after-free on filter The route4 classifier maintains a 16-slot fastmap cache that stores raw struct route4_filter pointers indexed by (id, iif). The read…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-74641

    ALSA: usx2y: bound the hwdep mmap fault offset

    In the Linux kernel, the following vulnerability has been resolved: ALSA: usx2y: bound the hwdep mmap fault offset snd_us428ctls_vm_fault() turns the faulting page offset into a kernel address with no bound of any kind: offset = vmf->pgoff << PAGE_SHIFT; vadd…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2026-93262

    md/raid5-ppl: fix use-after-free in ppl_do_flush()

    In the Linux kernel, the following vulnerability has been resolved: md/raid5-ppl: fix use-after-free in ppl_do_flush() The loop in ppl_do_flush() continues iterating after calling ppl_io_unit_finished(), touching io->pending_flushes and leading to a use-after…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2513277
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2516575
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2521054
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2521436
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2521498
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2532309
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2535158
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2540230
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2540323
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_83159.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-68377
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-68377
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-68377
  • article
    https://lore.kernel.org/linux-cve-announce/2026081044-CVE-2026-68377-ca6d@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2026-72262
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-72262
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-72262
  • article
    https://lore.kernel.org/linux-cve-announce/2026081555-CVE-2026-72262-c47f@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2026-74583
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-74583
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-74583
  • article
    https://lore.kernel.org/linux-cve-announce/2026082100-CVE-2026-74583-70cb@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2026-74641
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-74641
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-74641
  • article
    https://lore.kernel.org/linux-cve-announce/2026082223-CVE-2026-74641-92d7@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2026-74705
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-74705
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-74705
  • article
    https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-74705.mbox
  • report
    https://access.redhat.com/security/cve/CVE-2026-89526
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-89526
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-89526
  • article
    https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89526.mbox
  • report
    https://access.redhat.com/security/cve/CVE-2026-90036
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-90036
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-90036
  • article
    https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90036.mbox