CVE-2026-23272 | Linux Kernel up to 6.18.16/6.19.6/7.0-rc2 nf_tables synchronize_rcu state issue (EUVD-2026-13607)

VDB-352026 · CVE-2026-23272 · EUVD-2026-13607 LINUX KERNEL UP TO 6.18.16/6.19.6/7.0-RC2 NF_TABLES SYNCHRONIZE_RCU STATE ISSUE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.4 $0-$5k 2.18+ Summaryinfo A vulnerability labeled as critical has been found in Linux Kernel up to 6.18.16/6.19.6/7.0-rc2. This issue affects the function synchronize_rcu of the component nf_tables. The manipulation results in state issue. This vulnerability is identified as CVE-2026-23272. There is not any exploit available. The affected component should be upgraded. Detailsinfo A vulnerability classified as critical has been found in Linux Kernel up to 6.18.16/6.19.6/7.0-rc2. Affected is the function synchronize_rcu of the component nf_tables. The manipulation with an unknown input leads to a state issue vulnerability. CWE is classifying the issue as CWE-371. The impact remains unknown. CVE summarizes: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally bump set->nelems before insertion In case that the set is full, a new element gets published then removed without waiting for the RCU grace period, while RCU reader can be walking over it already. To address this issue, add the element transaction even if set is full, but toggle the set_full flag to report -ENFILE so the abort path safely unwinds the set to its previous state. As for element updates, decrement set->nelems to restore it. A simpler fix is to call synchronize_rcu() in the error path. However, with a large batch adding elements to already maxed-out set, this could cause noticeable slowdown of such batches. The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-23272 since 01/13/2026. The exploitability is told to be difficult. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/20/2026). Upgrading to version 6.18.17, 6.19.7 or 7.0-rc3 eliminates this vulnerability. Applying the patch 6826131c7674329335ca25df2550163eb8a1fd0c/ccb8c8f3c1127cf34d18c737309897c68046bf21/def602e498a4f951da95c95b1b8ce8ae68aa733a is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-13607). Productinfo Type Operating System Vendor Linux Name Kernel Version 6.18.0 6.18.1 6.18.2 6.18.3 6.18.4 6.18.5 6.18.6 6.18.7 6.18.8 6.18.9 6.18.10 6.18.11 6.18.12 6.18.13 6.18.14 6.18.15 6.18.16 6.19.0 6.19.1 6.19.2 6.19.3 6.19.4 6.19.5 6.19.6 7.0-rc1 7.0-rc2 License open-source Website Vendor: https://www.kernel.org/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.6 VulDB Meta Temp Score: 4.4 VulDB Base Score: 4.6 VulDB Temp Score: 4.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: State issue CWE: CWE-371 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Partially Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Kernel 6.18.17/6.19.7/7.0-rc3 Patch: 6826131c7674329335ca25df2550163eb8a1fd0c/ccb8c8f3c1127cf34d18c737309897c68046bf21/def602e498a4f951da95c95b1b8ce8ae68aa733a Timelineinfo 01/13/2026 CVE reserved 03/20/2026 +66 days Advisory disclosed 03/20/2026 +0 days VulDB entry created 03/20/2026 +0 days VulDB entry last update Sourcesinfo Vendor: kernel.org Advisory: git.kernel.org Status: Confirmed CVE: CVE-2026-23272 (🔒) GCVE (CVE): GCVE-0-2026-23272 GCVE (VulDB): GCVE-100-352026 EUVD: 🔒 Entryinfo Created: 03/20/2026 09:47 Updated: 03/20/2026 10:36 Changes: 03/20/2026 09:47 (59), 03/20/2026 10:36 (1) Complete: 🔍 Cache ID: 99:6A6:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸