From mboxrd@z Thu Jan 1 00:00:00 1970 From: AL-KERNEL To: kernel-cve@kernelcve.org Subject: [CVE-2026-97520][LOW] gfs2: move quota_init qc iterator increment [ Upstream Date: Thu, 24 Sep 2026 14:39:17 -0400 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-AL-KERNEL-CVE: CVE-2026-97520 X-AL-KERNEL-Priority: LOW X-AL-KERNEL-Severity: LOW X-AL-KERNEL-Base-Severity: LOW X-AL-KERNEL-KPANIC: NO X-AL-KERNEL-ActionableScore: 0 X-AL-KERNEL-ActionableScore-Lower: unknown X-AL-KERNEL-Commit: 04ec2f3b29b3c8a59950b8816b5ebc8ba052808a List-Id: CVE: CVE-2026-97520 Priority: LOW AL-KERNEL base severity: LOW KPANIC flag: NO Patch: gfs2: move quota_init qc iterator increment [ Upstream Commit: 04ec2f3b29b3c8a59950b8816b5ebc8ba052808a Upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=04ec2f3b29b3c8a59950b8816b5ebc8ba052808a Original CVE announcement: https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-97520 Analysis date: Thu, 24 Sep 2026 14:39:17 -0400 ActionableScore: 0 ActionableScore lower bound: unknown Actionable bucket: Ordinary Moderate Manual review required: NO Summary: No one-sentence report phrase was found. ====================================================================== ABOUT THIS REPORT ====================================================================== The original Linux kernel CVE announcement for CVE-2026-97520 is available here: https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-97520 The original announcement does not normally provide a security severity estimate, CVSS assessment, or enough information to determine whether the reported kernel bug represents a practically relevant security issue. This report was generated by AL-KERNEL, an AI-assisted Linux kernel vulnerability analysis system developed by Alexander Larkin. It combines an autonomous classifier with LLM-assisted technical analysis and a separate ActionableScore mechanism. The purpose of this report is to prioritize Linux kernel CVEs before manual review, identify cases that require prompt investigation, and support automatic closure of issues that are unlikely to have meaningful security impact. Published priority for this report: LOW Manual review required: NO A detailed explanation of the methodology and priority rules is included at the end of this message. ====================================================================== AL-KERNEL CLASSIFICATION RESULT ====================================================================== CVE-2026-97520 LOW https://www.kernelcve.org/list/?q=CVE-2026-97520 CHECK WITH IMPACT FROM ORIG NN LOW Maybe valid. Check manually. Hints by AL-KERNEL: The best (paranoid) CVSS is 'AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:N';BEST CVSS score: '0';DESCR 'This change is a code cleanup in gfs2_quota_init which moves the qc iterator increment from the loop body to the for loop increment expression. The iterator still advances once for each completed iteration including iterations that use continue. No memory safety issue, access control issue, information disclosure, privilege escalation, crash condition, or network reachable attack path is indicated by the patch.';NO MANUAL CHECK; ,and ActionableScore result is Ordinary Moderate (with actual score 0) YES DISK NO NO checked ====================================================================== ACTIONABLESCORE ANALYSIS ====================================================================== ActionableScore=0 PrimitiveClass=NONE RealUAF=NO HostAdminRequired=UNKNOWN NamespaceScopedPrivilege=UNKNOWN ImportantCandidate=NO ManualReview=NO AutoDowngradeAllowed=YES 1. ActionableScore * Raw conservative score: 0 * Conservative score: 0 * Raw paranoid score: 0 * Paranoid score: 0 * Final recommended bucket: **Ordinary Moderate**:: The supplied change is behavior-preserving iterator cleanup, not a security fix. No floor or cap applies. 2. Signal breakdown * 0: No memory-corruption primitive is established. `qc` advances once per completed loop iteration both before and after the change. * 0: No use-after-free, refcount operation, ownership transition, stale pointer, invalid access, authorization bypass, or security-boundary violation is shown. * 0: No crash, resource exhaustion, filesystem corruption, information disclosure, integrity impact, or privilege-escalation path is established. * 0: Remote reachability is not established. * 0: No attacker-controlled input or attacker-reachable vulnerable operation is established. * 0: No repeated release or refcount mutation exists. * 0: No filesystem ownership or COW violation exists. The code processes quota-change records, but the patch only moves `qc++` into the `for` increment clause. Important non-awarded signals: * Controlled reclaim not demonstrated because no lifetime defect exists. * Arbitrary write not demonstrated. * Availability impact not demonstrated. * Confidentiality and integrity impact not demonstrated. * No security-relevant semantic change is visible in the diff. 3. Reachability analysis No vulnerable operation is identified. The patch changes only whether the `qc` pointer increment is written in the loop body or in the loop increment expression. For iterations that execute `continue` when `qc_change` is zero, the previous implementation had already incremented `qc` before reaching `continue`. The new implementation executes `qc++` as part of normal `for` loop progression. Therefore, iterator behavior remains equivalent for the visible control flow. No capability requirement, namespace scope, host-administration prerequisite, special hardware requirement, race, or attacker-controlled trigger needs to be evaluated because the supplied patch does not establish a defect. 4. Primitive and severity interpretation The exact change is a readability and maintainability refactoring. It makes pointer progression explicit in the `for` statement and avoids mixing pointer advancement with duplicate-slot handling in the loop body. There is no active structured-object misuse and no fixed stale-storage issue. There is no cleanup/destructor use-after-free and no first lifetime operation followed by a second release or refcount mutation. No Class A, B, or C primitive is present. The demonstrated consequence is no security-relevant consequence. Any claim of kernel crash, corruption, disclosure, privilege escalation, or filesystem integrity impact would be unsupported by the supplied commit and diff. ImportantCandidate is NO because no meaningful kernel-security primitive exists. AutoDowngradeAllowed is YES because this is safely classified as a non-security maintenance change based on the available evidence. 5. One-sentence report phrase This patch is a behavior-preserving gfs2 quota iterator cleanup and does not establish a security vulnerability or actionable kernel-security impact. 6. Manual review recommendation NO MANUAL CHECK NEEDED The patch only relocates an equivalent iterator increment and contains no indication of a memory-safety, authorization, lifetime, ownership, or availability defect. 7. Call-site confidence Call-site confidence: high ====================================================================== UPSTREAM PATCH SUMMARY ====================================================================== Patch: gfs2: move quota_init qc iterator increment [ Upstream Commit: 04ec2f3b29b3c8a59950b8816b5ebc8ba052808a Upstream URL: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=04ec2f3b29b3c8a59950b8816b5ebc8ba052808a Changed files: fs/gfs2/quota.c Diff excerpt: Not included in this email. See the upstream URL for the full patch. Full patch: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=04ec2f3b29b3c8a59950b8816b5ebc8ba052808a ====================================================================== DETAILED REPORT METHODOLOGY ====================================================================== The original Linux kernel CVE announcement for CVE-2026-97520 can be found here: https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-97520 The original CVE announcement normally does not include a security-level estimate. In particular, it may not contain a CVSS assessment, an impact level, or enough information to determine whether the reported bug is a practically relevant security issue. One purpose of this parallel CVE list is to provide that missing technical and prioritization information. The original goal of the AL-KERNEL project was to prioritize Linux kernel CVE analysis automatically before manual review. The system can also help identify non-security issues that may be suitable for automatic closure. This report was generated by AL-KERNEL, an AI-assisted Linux kernel vulnerability analysis system developed by Alexander Larkin. The first analysis stage combines an autonomous classifier with additional LLM-based analysis. The autonomous classifier runs locally on a CPU and is based on a backpropagation neural network. Together, these mechanisms produce a technical vulnerability description, identify likely weakness types, estimate CVSS severity, and provide input for ActionableScore. Two CVSS estimates are retained because incomplete kernel vulnerability information often permits more than one defensible interpretation: Conservative CVSS vector: Not available The Best / paranoid CVSS vector: AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:N The Best / paranoid CVSS score: 0 The conservative vector represents a lower-impact interpretation. The Best/paranoid vector intentionally represents a plausible upper-bound interpretation and should not automatically be treated as demonstrated real-world impact. CVSS may also need to be adjusted for a particular Linux deployment, because actual reachability, privileges, enabled kernel configuration, hardware, namespaces, exposed device nodes, and other environmental conditions can differ significantly between systems. A separate ActionableScore mechanism evaluates practical remediation urgency. Its analysis may include reachability, attack prerequisites, subsystem exposure, memory-corruption characteristics, denial-of-service reliability, and possible confidentiality, integrity, or privilege-escalation impact. Conservative ActionableScore: unknown Paranoid ActionableScore: 0 The final base severity is taken directly from the second tab-separated field of the AL-KERNEL classification result. ActionableScore does not replace or independently override that final AL-KERNEL decision, and if ActionableScore adjusted impact level of ALKERNEL, then you would see self-readable flags above like INCREASED_TO_HIGH_BASED_ON_ACTIONABLESCOREHIGHEREQTHAN7. For an AL-KERNEL result of MODERATE, this report uses the following additional presentation split: ActionableScore below 5 -> MODERATE REGULAR ActionableScore 5 or more -> MODERATE 7.0 The distinction between MODERATE REGULAR and MODERATE 7.0 makes it possible to identify Moderate issues that should receive manual analysis and fixes before lower-priority MODERATE REGULAR issues. In many cases, MODERATE REGULAR fixes may wait for a later rebase or routine update. There is one override in which MODERATE REGULAR becomes MODERATE 7.0 even when the ActionableScore is below 5. When the AL-KERNEL result contains the KPANIC flag, a MODERATE result is always presented as MODERATE 7.0. The KPANIC flag selected with few regexps without usage of AI at all, so it helps to detect cases when Kernel Crash happens and similar (to filter False-Negative results from the LLM usage). KPANIC indicates that a reliable kernel crash, kernel panic, or similarly serious kernel availability impact was identified by the classification workflow. AL-KERNEL base severity for this report: LOW KPANIC detected for this report: NO Published priority for this report (same as in Subject): LOW These results are intended to support engineering triage. They are machine-generated estimates, and cases marked for manual review should be validated by a human security engineer before final disposition. For more info read docs linked from here: https://kernelcve.org/ (and you can submit you own patch there to generate such a report for non-existant CVE-id yet). Note that in many cases this AI tool selects higher severity, than real is (means you can expect Importants instead of Moderate 7.0 or Moderates 7.0 instead of regular Moderates). If you see such cases, please use reply email interface to add additional manual analyses info to this particular CVE. And please, please, let me know when you see Lows instead of Importants or Important instead of Low (because particular for such cases I need to tune this AI tool to make it better for this one and next similar). My contact email for such notifications is alexanjelausa@gmail.com (and both send reply to CVE record itself too and see "reply" button below for howto reply).