CVE-2026-23423 | Linux Kernel up to 6.18.16/6.19.6/7.0-rc2 btrfs btrfs_uring_read_extent allocation of resources

VDB-355096 · CVE-2026-23423 · GCVE-0-2026-23423 LINUX KERNEL UP TO 6.18.16/6.19.6/7.0-RC2 BTRFS BTRFS_URING_READ_EXTENT ALLOCATION OF RESOURCES HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.6 $0-$5k 0.82+ Summaryinfo A vulnerability classified as critical was found in Linux Kernel up to 6.18.16/6.19.6/7.0-rc2. Impacted is the function btrfs_uring_read_extent of the component btrfs. Executing a manipulation can lead to allocation of resources. This vulnerability is handled as CVE-2026-23423. There is not any exploit available. Upgrading the affected component is advised. Detailsinfo A vulnerability classified as critical was found in Linux Kernel up to 6.18.16/6.19.6/7.0-rc2. This vulnerability affects the function btrfs_uring_read_extent of the component btrfs. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes: In the Linux kernel, the following vulnerability has been resolved: btrfs: free pages on error in btrfs_uring_read_extent() In this function the 'pages' object is never freed in the hopes that it is picked up by btrfs_uring_read_finished() whenever that executes in the future. But that's just the happy path. Along the way previous allocations might have gone wrong, or we might not get -EIOCBQUEUED from btrfs_encoded_read_regular_fill_pages(). In all these cases, we go to a cleanup section that frees all memory allocated by this function without assuming any deferred execution, and this also needs to happen for the 'pages' allocation. The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-23423 since 01/13/2026. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/03/2026). Upgrading to version 6.18.17, 6.19.7 or 7.0-rc3 eliminates this vulnerability. Applying the patch d4f210de01eaccac61eee657f676045ef9771d07/628895890b0c9ac9129129e89455da7db95ba343/3f501412f2079ca14bf68a18d80a2b7a823f1f64 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. 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: 8.0 VulDB Meta Temp Score: 7.6 VulDB Base Score: 8.0 VulDB Temp Score: 7.6 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: Allocation of resources CWE: CWE-770 / CWE-400 / CWE-404 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: d4f210de01eaccac61eee657f676045ef9771d07/628895890b0c9ac9129129e89455da7db95ba343/3f501412f2079ca14bf68a18d80a2b7a823f1f64 Timelineinfo 01/13/2026 CVE reserved 04/03/2026 +79 days Advisory disclosed 04/03/2026 +0 days VulDB entry created 04/03/2026 +0 days VulDB entry last update Sourcesinfo Vendor: kernel.org Advisory: git.kernel.org Status: Confirmed CVE: CVE-2026-23423 (🔒) GCVE (CVE): GCVE-0-2026-23423 GCVE (VulDB): GCVE-100-355096 Entryinfo Created: 04/03/2026 17:03 Changes: 04/03/2026 17:03 (59) Complete: 🔍 Cache ID: 99:68E:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸