CVE-2026-31594 | Linux Kernel up to 6.18.23/6.19.13/7.0.0 epf_ntb_epc_destroy symlink

VDB-359389 · CVE-2026-31594 · GCVE-0-2026-31594 LINUX KERNEL UP TO 6.18.23/6.19.13/7.0.0 EPF_NTB_EPC_DESTROY SYMLINK HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.6 $0-$5k 0.29+ Summaryinfo A vulnerability identified as critical has been detected in Linux Kernel up to 6.18.23/6.19.13/7.0.0. This affects the function epf_ntb_epc_destroy. This manipulation causes symlink. The identification of this vulnerability is CVE-2026-31594. There is no exploit available. You should upgrade the affected component. Detailsinfo A vulnerability classified as critical was found in Linux Kernel up to 6.18.23/6.19.13/7.0.0. Affected by this vulnerability is the function epf_ntb_epc_destroy. The manipulation with an unknown input leads to a symlink vulnerability. The CWE definition for the vulnerability is CWE-61. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: pci-epf-vntb: Remove duplicate resource teardown epf_ntb_epc_destroy() duplicates the teardown that the caller is supposed to perform later. This leads to an oops when .allow_link fails or when .drop_link is performed. The following is an example oops of the former case: Unable to handle kernel paging request at virtual address dead000000000108 [...] [dead000000000108] address between user and kernel address ranges Internal error: Oops: 0000000096000044 [#1] SMP [...] Call trace: pci_epc_remove_epf+0x78/0xe0 (P) pci_primary_epc_epf_link+0x88/0xa8 configfs_symlink+0x1f4/0x5a0 vfs_symlink+0x134/0x1d8 do_symlinkat+0x88/0x138 __arm64_sys_symlinkat+0x74/0xe0 [...] Remove the helper, and drop pci_epc_put(). EPC device refcounting is tied to the configfs EPC group lifetime, and pci_epc_put() in the .drop_link path is sufficient. The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-31594 since 03/09/2026. The exploitation appears to be easy. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/24/2026). Upgrading to version 6.18.24, 6.19.14 or 7.0.1 eliminates this vulnerability. Applying the patch cec9ead73ab154a7953f6ab8dd5127e0d6bbf95a/478e776101592eb63298714e96823ef78a3295ec/a7a3cab4d33fd8a8aed864c447d0d7c99e85404e 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 6.18.21 6.18.22 6.18.23 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 6.19.11 6.19.12 6.19.13 7.0 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: Symlink CWE: CWE-61 / CWE-59 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 6.18.24/6.19.14/7.0.1 Patch: cec9ead73ab154a7953f6ab8dd5127e0d6bbf95a/478e776101592eb63298714e96823ef78a3295ec/a7a3cab4d33fd8a8aed864c447d0d7c99e85404e 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-2026-31594 (🔒) GCVE (CVE): GCVE-0-2026-31594 GCVE (VulDB): GCVE-100-359389 Entryinfo Created: 04/24/2026 17:52 Changes: 04/24/2026 17:52 (58) Complete: 🔍 Cache ID: 99:223:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸