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OpenAdvisories
Critical RHSA-2026:57254 9 CVEs

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

Published Aug 20, 2026 · Updated Nov 13, 2026

Ecosystem: Red Hat

Fixed packages 28

ReleasePackageFixed in
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-core 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-core 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-debuginfo 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-devel 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-kvm 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-modules 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-modules-extra 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debuginfo 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debuginfo-common-x86_64 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-devel 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-kvm 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-modules 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-modules-extra 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-core 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-core 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-debuginfo 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-devel 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-modules 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-modules-extra 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debuginfo 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debuginfo-common-x86_64 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-devel 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-modules 0:4.18.0-553.157.1.rt7.498.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-modules-extra 0:4.18.0-553.157.1.rt7.498.el8_10

Vulnerabilities 9

  • Critical 9.8
    CVE-2026-63887

    scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf

    In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf iscsi_encode_text_output() concatenates "key=value\0" records into login->rsp_buf, an 8192-byte kzalloc(MAX_KEY_VALUE_…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Critical 9.8
    CVE-2026-63888

    scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()

    In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd() Two latent bugs in the Text-phase handler, both present since the original LIO integration in commit e48354ce…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Critical 9.8
    CVE-2026-68388

    smb/client: handle overlapping allocated ranges in fallocate

    In the Linux kernel, the following vulnerability has been resolved: smb/client: handle overlapping allocated ranges in fallocate smb3_simple_fallocate_range() can skip holes when an allocated range returned by the server starts before the current fallocate of…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2026-46120

    ip6_gre: Use cached t->net in ip6erspan_changelink().

    In the Linux kernel, the following vulnerability has been resolved: ip6_gre: Use cached t->net in ip6erspan_changelink(). After commit 5e72ce3e3980 ("net: ipv6: Use link netns in newlink() of rtnl_link_ops"), ip6erspan_newlink() correctly resolves the per-net…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-52991

    sched/psi: fix race between file release and pressure write

    In the Linux kernel, the following vulnerability has been resolved: sched/psi: fix race between file release and pressure write A potential race condition exists between pressure write and cgroup file release regarding the priv member of struct kernfs_open_fi…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-53189

    mm/huge_memory: update file PMD counter before folio_put()

    In the Linux kernel, the following vulnerability has been resolved: mm/huge_memory: update file PMD counter before folio_put() __split_huge_pmd_locked() updates the file/shmem RSS counter after dropping the PMD mapping's folio reference. If folio_put() drops …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.5
    CVE-2026-64048

    net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot

    In the Linux kernel, the following vulnerability has been resolved: net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot On the SMC-D client, slot 0 of ini->ism_dev[]/ini->ism_chid[] is reserved for an SMC-Dv1 device. smc_find_ism_v2_device_clnt()…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.1
    CVE-2026-64379

    smb: client: mask server-provided mode to 07777 in modefromsid

    In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.0
    CVE-2024-56602

    net: ieee802154: do not leave a dangling sk pointer in ieee802154_create()

    In the Linux kernel, the following vulnerability has been resolved: net: ieee802154: do not leave a dangling sk pointer in ieee802154_create() sock_init_data() attaches the allocated sk object to the provided sock object. If ieee802154_create() fails later, t…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2334501
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2482614
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2492403
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2492788
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2502443
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2502447
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2502589
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2507135
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2513470
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_57254.json
  • report
    https://access.redhat.com/security/cve/CVE-2024-56602
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2024-56602
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2024-56602
  • article
    https://lore.kernel.org/linux-cve-announce/2024122703-CVE-2024-56602-d030@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2026-46120
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-46120
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-46120
  • article
    https://lore.kernel.org/linux-cve-announce/2026052815-CVE-2026-46120-1a01@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2026-52991
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-52991
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-52991
  • article
    https://lore.kernel.org/linux-cve-announce/2026062444-CVE-2026-52991-18fe@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2026-53189
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-53189
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-53189
  • article
    https://lore.kernel.org/linux-cve-announce/2026062557-CVE-2026-53189-1b4a@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2026-63887
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-63887
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-63887
  • article
    https://lore.kernel.org/linux-cve-announce/2026071940-CVE-2026-63887-cf4b@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2026-63888
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-63888
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-63888
  • article
    https://lore.kernel.org/linux-cve-announce/2026071940-CVE-2026-63888-a5d6@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2026-64048
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-64048
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-64048
  • article
    https://kernelcve.org/list/?q=CVE-2026-64048