{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.", "title": "Topic" }, { "category": "general", "text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() (CVE-2026-23193)\n\n* kernel: Linux kernel (qla2xxx): Double free vulnerability leads to denial of service and potential privilege escalation. (CVE-2025-71238)\n\n* kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402)\n\n* kernel: crypto: algif_aead - Revert to operating out-of-place (CVE-2026-31431)\n\nFor 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.", "title": "Details" }, { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2026:14165", "url": "https://access.redhat.com/errata/RHSA-2026:14165" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "2439887", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439887" }, { "category": "external", "summary": "2444398", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2444398" }, { "category": "external", "summary": "2454844", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454844" }, { "category": "external", "summary": "2460538", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460538" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_14165.json" } ], "title": "Red Hat Security Advisory: kernel security update", "tracking": { "current_release_date": "2026-06-30T17:36:52+00:00", "generator": { "date": "2026-06-30T17:36:52+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.1" } }, "id": "RHSA-2026:14165", "initial_release_date": "2026-05-06T14:14:57+00:00", "revision_history": [ { "date": "2026-05-06T14:14:57+00:00", "number": "1", "summary": "Initial version" }, { "date": "2026-05-06T14:14:57+00:00", "number": "2", "summary": "Last updated version" }, { "date": 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"vulnerabilities": [ { "cve": "CVE-2025-71238", "cwe": { "id": "CWE-672", "name": "Operation on a Resource after Expiration or Release" }, "discovery_date": "2026-03-04T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2444398" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel's `qla2xxx` block SCSI generic (bsg) interface. This vulnerability, a double free, occurs because certain vendor-specific handlers incorrectly call the `bsg_job_done` function on both successful and failed operation paths. A local user could exploit this to trigger memory corruption, leading to a kernel crash and a Denial of Service (DoS). There is also a theoretical risk of local privilege escalation due to the memory corruption.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: Linux kernel (qla2xxx): Double free vulnerability leads to denial of service and potential privilege escalation.", "title": "Vulnerability summary" }, { "category": "other", "text": "A kernel double free can be triggered in the qla2xxx bsg interface because some vendor specific handlers called bsg_job_done on both success and failure paths. This can result in the same bsg job being completed and freed twice which leads to memory corruption and a kernel crash. The issue is not network reachable. Impact is denial of service and there is a theoretical risk of local privilege escalation because the flaw is a kernel memory corruption condition.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.190.1.el8_4.src", "BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.190.1.el8_4.noarch", "BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-debug-0:4.18.0-305.190.1.el8_4.x86_64", 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Similar to the connection usage count\nlogic, the waiter signaled by complete() (e.g., in the session release\npath) may wake up and free the iscsit_session structure immediately.\n\nThis creates a race condition where the current thread may attempt to\nexecute spin_unlock_bh() on a session structure that has already been\ndeallocated, resulting in a KASAN slab-use-after-free.\n\nTo resolve this, release the session_usage_lock before calling complete()\nto ensure all dereferences of the sess pointer are finished before the\nwaiter is allowed to proceed with deallocation.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()", "title": "Vulnerability summary" }, { "category": "other", "text": "A use after free can occur in the iSCSI target session usage count logic because iscsit_dec_session_usage_count can call complete while holding session_usage_lock. A waiting thread in the session release path can wake up and free the session structure immediately after the completion is signaled. The current thread may then attempt to unlock or otherwise access fields in a session object that has already been deallocated which can trigger a slab use after free and crash the kernel. The attack surface is adjacent network because iSCSI targets are typically reachable only inside storage or data center networks. Impact can be denial of service. A conservative assessment also considers potential confidentiality and integrity impact due to kernel memory corruption from a use after free.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.190.1.el8_4.src", "BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.190.1.el8_4.noarch", "BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-debug-0:4.18.0-305.190.1.el8_4.x86_64", 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A remote, unauthenticated attacker can exploit this heap overflow vulnerability in the NFSv4.0 LOCK replay cache. By using two cooperating NFSv4.0 clients, where one sets a lock with a large owner string and another requests a conflicting lock, the attacker can trigger a slab-out-of-bounds write. This corruption of adjacent heap memory could lead to arbitrary code execution or a denial of service.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache", "title": "Vulnerability summary" }, { "category": "other", "text": "This Important flaw in the Linux kernel's NFSv4.0 server (nfsd) allows a heap overflow. In this flaw a local attacker can trigger this by orchestrating two NFSv4.0 clients to create a conflicting lock with an oversized owner string.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.190.1.el8_4.src", "BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.190.1.el8_4.noarch", "BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-debug-0:4.18.0-305.190.1.el8_4.x86_64", 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"BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-debuginfo-0:4.18.0-305.190.1.el8_4.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ], "title": "kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache" }, { "cve": "CVE-2026-31431", "cwe": { "id": "CWE-1288", "name": "Improper Validation of Consistency within Input" }, "discovery_date": "2026-04-22T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2460538" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel's algif_aead cryptographic algorithm interface. An incorrect in-place operation causes source and destination data mappings to differ during cryptographic processing. A low-privileged local attacker can exploit this flaw to corrupt the contents of sensitive system files and escalate to root privileges.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: crypto: algif_aead - Revert to operating out-of-place", "title": "Vulnerability summary" }, { "category": "other", "text": "This issue is classified as Important, rather than Critical severity, because exploitation requires local access to the system. A low-privileged local attacker can exploit this flaw in the Linux kernel's cryptographic interface to gain root privileges by overwriting sensitive system files. Exploitation does not require user interaction, potentially resulting in full compromise of confidentiality, integrity, and availability.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.190.1.el8_4.src", "BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.190.1.el8_4.noarch", "BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-debug-0:4.18.0-305.190.1.el8_4.x86_64", 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"name": "Incorrect Calculation of Buffer Size" }, "discovery_date": "2026-05-06T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2467022" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel, specifically within the `algif_aead` module. The vulnerability involves an incorrect check for the minimum receive buffer size during decryption, which did not properly account for the tag size. This could potentially lead to issues with data integrity or processing during cryptographic decryption operations.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: crypto: algif_aead - Fix minimum RX size check for decryption", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.190.1.el8_4.src", "BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.190.1.el8_4.x86_64", "BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.190.1.el8_4.noarch", "BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.190.1.el8_4.x86_64", 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"category": "impact", "details": "Moderate" } ], "title": "kernel: crypto: algif_aead - Fix minimum RX size check for decryption" } ] }