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High ALSA-2026:83159 9 CVEs

Important: kernel-rt security, bug fix, and enhancement update

Published Oct 14, 2026 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* kernel: Linux kernel: Denial of Service due to use-after-free in act_tunnel_key (CVE-2026-68377)
* kernel: ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get (CVE-2026-72262)
* kernel: net/sched: cls_route: fix fastmap use-after-free on filter (CVE-2026-74583)
* kernel: ALSA: usx2y: bound the hwdep mmap fault offset (CVE-2026-74641)
* kernel: udp: fix potential use-after-free in tunnel segmentation (CVE-2026-74705)
* kernel: svcrdma: Validate Read chunk positions before reconstruction (CVE-2026-89526)
* kernel: NFSD: Prevent client use-after-free during blocked-lock reaping (CVE-2026-90036)
* kernel: svcrdma: Reject Write/Reply chunks with segcount 0 (CVE-2026-93228)
* kernel: md/raid5-ppl: fix use-after-free in ppl_do_flush() (CVE-2026-93262)

Bug Fix(es) and Enhancement(s):

* powerpc/pseries: pci - logic bug in SR-IOV enable (JIRA:AlmaLinux-240146)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Fixed packages 10

ReleasePackageFixed in
AlmaLinux · 8 kernel-rt 4.18.0-553.174.1.rt7.515.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.174.1.rt7.515.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.174.1.rt7.515.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.174.1.rt7.515.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.174.1.rt7.515.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.174.1.rt7.515.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.174.1.rt7.515.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.174.1.rt7.515.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.174.1.rt7.515.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 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

  • report
    https://access.redhat.com/security/cve/CVE-2026-68377
  • report
    https://access.redhat.com/security/cve/CVE-2026-72262
  • report
    https://access.redhat.com/security/cve/CVE-2026-74583
  • report
    https://access.redhat.com/security/cve/CVE-2026-74641
  • report
    https://access.redhat.com/security/cve/CVE-2026-74705
  • report
    https://access.redhat.com/security/cve/CVE-2026-89526
  • report
    https://access.redhat.com/security/cve/CVE-2026-90036
  • report
    https://access.redhat.com/security/cve/CVE-2026-93228
  • report
    https://access.redhat.com/security/cve/CVE-2026-93262
  • report
    https://bugzilla.redhat.com/2513277
  • report
    https://bugzilla.redhat.com/2516575
  • report
    https://bugzilla.redhat.com/2521054
  • report
    https://bugzilla.redhat.com/2521436
  • report
    https://bugzilla.redhat.com/2521498
  • report
    https://bugzilla.redhat.com/2532309
  • report
    https://bugzilla.redhat.com/2535158
  • report
    https://bugzilla.redhat.com/2540230
  • report
    https://bugzilla.redhat.com/2540323
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-83159.html