CVE-2026-31567 | Linux Kernel up to 6.18.20/6.19.10 Uswsusp Interface stack-based overflow

VDB-359379 · CVE-2026-31567 · GCVE-0-2026-31567 LINUX KERNEL UP TO 6.18.20/6.19.10 USWSUSP INTERFACE STACK-BASED OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.6 $5k-$25k 1.14+ Summaryinfo A vulnerability classified as critical has been found in Linux Kernel up to 6.18.20/6.19.10. This impacts an unknown function of the component Uswsusp Interface. Performing a manipulation results in stack-based overflow. This vulnerability is cataloged as CVE-2026-31567. There is no exploit available. It is recommended to upgrade the affected component. Detailsinfo A vulnerability classified as critical has been found in Linux Kernel up to 6.18.20/6.19.10. This affects some unknown processing of the component Uswsusp Interface. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is: In the Linux kernel, the following vulnerability has been resolved: PM: sleep: Drop spurious WARN_ON() from pm_restore_gfp_mask() Commit 35e4a69b2003f ("PM: sleep: Allow pm_restrict_gfp_mask() stacking") introduced refcount-based GFP mask management that warns when pm_restore_gfp_mask() is called with saved_gfp_count == 0. Some hibernation paths call pm_restore_gfp_mask() defensively where the GFP mask may or may not be restricted depending on the execution path. For example, the uswsusp interface invokes it in SNAPSHOT_CREATE_IMAGE, SNAPSHOT_UNFREEZE, and snapshot_release(). Before the stacking change this was a silent no-op; it now triggers a spurious WARNING. Remove the WARN_ON() wrapper from the !saved_gfp_count check while retaining the check itself, so that defensive calls remain harmless without producing false warnings. [ rjw: Subject tweak ] It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-31567 since 03/09/2026. The exploitability is told to be easy. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 04/24/2026). Upgrading to version 6.18.21 or 6.19.11 eliminates this vulnerability. Applying the patch 3025ca5daa9d682b629c0c958b538e41deeb559d/f19d1323aa3dd7ead469aef47d9085f8939565d9/a8d51efb5929ae308895455a3e496b5eca2cd143 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 6.18.17 6.18.18 6.18.19 6.18.20 6.19.0 6.19.1 6.19.2 6.19.3 6.19.4 6.19.5 6.19.6 6.19.7 6.19.8 6.19.9 6.19.10 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: Stack-based overflow CWE: CWE-121 / CWE-119 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 6.18.21/6.19.11 Patch: 3025ca5daa9d682b629c0c958b538e41deeb559d/f19d1323aa3dd7ead469aef47d9085f8939565d9/a8d51efb5929ae308895455a3e496b5eca2cd143 Timelineinfo 03/09/2026 CVE reserved 04/24/2026 +45 days Advisory disclosed 04/24/2026 +0 days VulDB entry created 04/24/2026 +0 days VulDB entry last update Sourcesinfo Vendor: kernel.org Advisory: git.kernel.org Status: Confirmed CVE: CVE-2026-31567 (🔒) GCVE (CVE): GCVE-0-2026-31567 GCVE (VulDB): GCVE-100-359379 Entryinfo Created: 04/24/2026 17:48 Changes: 04/24/2026 17:48 (58) Complete: 🔍 Cache ID: 99:977:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸