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High ELSA-2026-57253 9 CVEs

Important: kernel security, bug fix, and enhancement update (Oracle Linux 8)

Published Aug 21, 2026 · Updated Aug 21, 2026

Ecosystem: Oracle Linux

Summary

[4.18.0-553.157.1]
- Update Oracle Linux certificates (Kevin Lyons)
- Disable signing for aarch64 (Ilya Okomin)
- Oracle Linux RHCK Module Signing Key was added to the kernel trusted keys list (olkmod_signing_key.pem) [Orabug: 29539237]
- Update x509.genkey [Orabug: 24817676]
- Conflict with shim-ia32 and shim-x64 <= 15.3-1.0.3
- Remove upstream reference during boot (Kevin Lyons) [Orabug: 34750652]
- Add new Oracle Linux Driver Signing (key 1) certificate [Orabug: 37985772]

[4.18.0-553.157.1]
- smb/client: handle overlapping allocated ranges in fallocate (CKI Backport Bot) [RHEL-236195] {CVE-2026-68388}
- mm, page_alloc: skip ->waternark_boost for atomic order-0 allocations (Jay Shin) [RHEL-219767]
- mm, page_alloc: reset the zone->watermark_boost early (Jay Shin) [RHEL-219767]
- scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd() (Maurizio Lombardi) [RHEL-213227] {CVE-2026-63888}
- net: ieee802154: do not leave a dangling sk pointer in ieee802154_create() (Abhishek Rawal) [RHEL-224189] {CVE-2024-56602}
- cgroup/psi: Set of->priv to NULL upon file release (Waiman Long) [RHEL-232546]
- sched/psi: Create the psimon kthread outside of cgroup_mutex (Waiman Long) [RHEL-232546]
- sched/psi: fix race between file release and pressure write (Waiman Long) [RHEL-232546] {CVE-2026-52991}
- sched/psi: Remove unused parameter nbytes of psi_trigger_create() (Waiman Long) [RHEL-232546]
- psi: fix 'no previous prototype' warnings when CONFIG_CGROUPS=n (Waiman Long) [RHEL-232546]
- smb: client: mask server-provided mode to 07777 in modefromsid (CKI Backport Bot) [RHEL-234516] {CVE-2026-64379}
- mm/huge_memory: update file PMD counter before folio_put() (Luiz Capitulino) [RHEL-231209] {CVE-2026-53189}
- net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot (CKI Backport Bot) [RHEL-230094] {CVE-2026-64048}
- scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CKI Backport Bot) [RHEL-213200] {CVE-2026-63887}
- ip6_gre: Use cached t->net in ip6erspan_changelink(). (CKI Backport Bot) [RHEL-180148] {CVE-2026-46120}

Fixed packages 20

ReleasePackageFixed in
Oracle Linux · 8 bpftool 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-abi-stablelists 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-core 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-cross-headers 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-debug 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-debug-core 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-debug-devel 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-debug-modules 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-debug-modules-extra 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-devel 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-doc 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-headers 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-modules 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-modules-extra 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-tools 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-tools-libs 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 kernel-tools-libs-devel 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 perf 0:4.18.0-553.157.1.el8_10
Oracle Linux · 8 python3-perf 0:4.18.0-553.157.1.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