[El-errata] ELSA-2026-50374 Important: Oracle Linux 8 Unbreakable Enterprise kernel security update

Mon Jul 6 23:18:34 UTC 2026

Oracle Linux Security Advisory ELSA-2026-50374

http://linux.oracle.com/errata/ELSA-2026-50374.html

The following updated rpms for Oracle Linux 8 have been uploaded to the Unbreakable Linux Network:

x86_64:
kernel-uek-5.4.17-2136.357.3.1.el8uek.x86_64.rpm
kernel-uek-container-5.4.17-2136.357.3.1.el8uek.x86_64.rpm
kernel-uek-container-debug-5.4.17-2136.357.3.1.el8uek.x86_64.rpm
kernel-uek-debug-5.4.17-2136.357.3.1.el8uek.x86_64.rpm
kernel-uek-debug-devel-5.4.17-2136.357.3.1.el8uek.x86_64.rpm
kernel-uek-devel-5.4.17-2136.357.3.1.el8uek.x86_64.rpm
kernel-uek-doc-5.4.17-2136.357.3.1.el8uek.noarch.rpm

SRPMS:
http://oss.oracle.com/ol8/SRPMS-updates/kernel-uek-5.4.17-2136.357.3.1.el8uek.src.rpm

Related CVEs:

CVE-2022-50073
CVE-2025-10263
CVE-2026-31504
CVE-2026-31657
CVE-2026-43037
CVE-2026-46331
CVE-2026-52943
CVE-2026-53359

Description of changes:

[5.4.17-2136.357.3.1]
- KVM: x86: Fix shadow paging use-after-free due to unexpected role (Paolo Bonzini)  [Orabug: 39673892]
- KVM: x86: Fix shadow paging use-after-free due to unexpected GFN (Sean Christopherson)  [Orabug: 39673892]
- KVM: x86/MMU: Recursively zap nested TDP SPs when zapping last/only parent (Ben Gardon)  [Orabug: 39673892]
- KVM: x86/mmu: Move flush logic from mmu_page_zap_pte() to FNAME(invlpg) (Sean Christopherson)  [Orabug: 39673892]
- KVM: x86/mmu: pull call to drop_large_spte() into __link_shadow_page() (Paolo Bonzini)  [Orabug: 39673892]
- KVM: x86/mmu: Passing up the error state of mmu_alloc_shadow_roots() (Like Xu)  [Orabug: 39673892]
- KVM: MMU: load PDPTRs outside mmu_lock (Paolo Bonzini)  [Orabug: 39673892]
- KVM: x86/mmu: Check PDPTRs before allocating PAE roots (Sean Christopherson)  [Orabug: 39673892]
- KVM: x86/mmu: Always pass 0 for @quadrant when gptes are 8 bytes (David Matlack)  [Orabug: 39673892]
- KVM: x86/mmu: Derive shadow MMU page role from parent (David Matlack)  [Orabug: 39673892]
- KVM: X86: Remove useless code to set role.gpte_is_8_bytes when role.direct (Lai Jiangshan)  [Orabug: 39673892]
- KVM: X86: Synchronize the shadow pagetable before link it (Lai Jiangshan)  [Orabug: 39673892]
- KVM: X86: Fix missed remote tlb flush in rmap_write_protect() (Lai Jiangshan)  [Orabug: 39673892]
- KVM: x86/mmu: Refactor shadow walk in __direct_map() to reduce indentation (Sean Christopherson)  [Orabug: 39673892]
- KVM: x86/mmu: Stop passing "direct" to mmu_alloc_root() (David Matlack)  [Orabug: 39673892]
- KVM: x86/mmu: Use a bool for direct (David Matlack)  [Orabug: 39673892]
- kvm: mmu: Replace unsigned with unsigned int for PTE access (Ben Gardon)  [Orabug: 39673892]
- KVM: x86/mmu: Ensure MMU pages are available when allocating roots (Sean Christopherson)  [Orabug: 39673892]
- KVM: x86/mmu: Allocate pae_root and lm_root pages in dedicated helper (Sean Christopherson)  [Orabug: 39673892]
- KVM: x86/mmu: Allocate the lm_root before allocating PAE roots (Sean Christopherson)  [Orabug: 39673892]
- KVM: x86/mmu: Capture 'mmu' in a local variable when allocating roots (Sean Christopherson)  [Orabug: 39673892]
- KVM: x86/mmu: Alloc page for PDPTEs when shadowing 32-bit NPT with 64-bit (Sean Christopherson)  [Orabug: 39673892]
- KVM: x86/mmu: Stash 'kvm' in a local variable in kvm_mmu_free_roots() (Sean Christopherson)  [Orabug: 39673892]
- KVM: x86/mmu: Add a helper to consolidate root sp allocation (Sean Christopherson)  [Orabug: 39673892]
- net/sched: act_pedit: fix action bind logic (Pedro Tammela)  [Orabug: 39680880]
- net/sched: act_pedit: free pedit keys on bail from offset check (Pedro Tammela)  [Orabug: 39680880]
- net/sched: fix pedit partial COW leading to page cache corruption (Rajat Gupta)  [Orabug: 39680880]  {CVE-2026-46331}
- net/sched: act_pedit: Parse L3 Header for L4 offset (Max Tottenham)  [Orabug: 39680880]
- net/sched: act_pedit: rate limit datapath messages (Pedro Tammela)  [Orabug: 39680880]
- net/sched: act_pedit: check static offsets a priori (Pedro Tammela)  [Orabug: 39680880]
- net/sched: act_pedit: remove extra check for key type (Pedro Tammela)  [Orabug: 39680880]
- net/sched: simplify tcf_pedit_act (Pedro Tammela)  [Orabug: 39680880]
- net/sched: transition act_pedit to rcu and percpu stats (Pedro Tammela)  [Orabug: 39680880]
- net/sched: act_pedit: use NLA_POLICY for parsing 'ex' keys (Pedro Tammela)  [Orabug: 39680880]

[5.4.17-2136.357.3]
- net: skbuff: fix missing zerocopy reference in pskb_carve helpers (Minh Nguyen)  [Orabug: 39619389]  {CVE-2026-52943}

[5.4.17-2136.357.2]
- net: fix fanout UAF in packet_release() via NETDEV_UP race (Yochai Eisenrich)  [Orabug: 39250953]  {CVE-2026-31504}
- x86/kaslr: Recognize all ZONE_DEVICE users as physaddr consumers (Dan Williams)  [Orabug: 39429802]
- x86/kaslr: Reduce KASLR entropy on most x86 systems (Balbir Singh)  [Orabug: 39429802]
- net: tap: NULL pointer derefence in dev_parse_header_protocol when skb->dev is null (Cezar Bulinaru)  [Orabug: 39526882]  {CVE-2022-50073}
- arm64: errata: Mitigate TLBI errata on various Arm CPUs (Mark Rutland)  [Orabug: 39548666]  {CVE-2025-10263}
- arm64: tlb: Add ARM64_WORKAROUND_REPEAT_TLBI_SYNC (Mark Rutland)  [Orabug: 39548666]
- ARM: uek: Disable CONFIG_QCOM_FALKOR_ERRATUM_1003 (Boris Ostrovsky)  [Orabug: 39548666]
- arm64: tlb: allow XZR argument to TLBI ops (Mark Rutland)  [Orabug: 39548666]
- arm64: cputype: Add C1-Premium definitions (Mark Rutland)  [Orabug: 39548666]
- arm64: cputype: Add C1-Ultra definitions (Mark Rutland)  [Orabug: 39548666]
- ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (Eric Dumazet)  [Orabug: 39300926]  {CVE-2026-43037}

[5.4.17-2136.357.1]
- batman-adv: hold claim backbone gateways by reference (Haoze Xie)  [Orabug: 39262375]  {CVE-2026-31657}
- scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker (Michael Bommarito)  [Orabug: 39446045]
- scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd() (Michael Bommarito)  [Orabug: 39446045]
- scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (Michael Bommarito)  [Orabug: 39446045]
- rds: Drop rds conn in connect worker if not in down state. (Rohit Nair)  [Orabug: 39152239]

[5.4.17-2136.356.4.1]
- smb: client: reject userspace cifs.spnego descriptions (Asim Viladi Oglu Manizada)  [Orabug: 39463669] {CVE-2026-46243}