CVE-2026-31395 | Linux Kernel up to 6.18.19/6.19.9/7.0-rc4 bnxt_en bnxt_async_event_process memory corruption

VDB-355166 · CVE-2026-31395 · GCVE-0-2026-31395 LINUX KERNEL UP TO 6.18.19/6.19.9/7.0-RC4 BNXT_EN BNXT_ASYNC_EVENT_PROCESS MEMORY CORRUPTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.6 $5k-$25k 0.84 Summaryinfo A vulnerability classified as critical was found in Linux Kernel up to 6.18.19/6.19.9/7.0-rc4. This impacts the function bnxt_async_event_process of the component bnxt_en. Such manipulation leads to memory corruption. This vulnerability is documented as CVE-2026-31395. There is not any exploit available. Upgrading the affected component is advised. Detailsinfo A vulnerability was found in Linux Kernel up to 6.18.19/6.19.9/7.0-rc4. It has been rated as critical. Affected by this issue is the function bnxt_async_event_process of the component bnxt_en. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes: In the Linux kernel, the following vulnerability has been resolved: bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler The ASYNC_EVENT_CMPL_EVENT_ID_DBG_BUF_PRODUCER handler in bnxt_async_event_process() uses a firmware-supplied 'type' field directly as an index into bp->bs_trace[] without bounds validation. The 'type' field is a 16-bit value extracted from DMA-mapped completion ring memory that the NIC writes directly to host RAM. A malicious or compromised NIC can supply any value from 0 to 65535, causing an out-of-bounds access into kernel heap memory. The bnxt_bs_trace_check_wrap() call then dereferences bs_trace->magic_byte and writes to bs_trace->last_offset and bs_trace->wrapped, leading to kernel memory corruption or a crash. Fix by adding a bounds check and defining BNXT_TRACE_MAX as DBG_LOG_BUFFER_FLUSH_REQ_TYPE_ERR_QPC_TRACE + 1 to cover all currently defined firmware trace types (0x0 through 0xc). The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-31395 since 03/09/2026. The exploitation is known to be easy. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 04/03/2026). Upgrading to version 6.18.20, 6.19.10 or 7.0-rc5 eliminates this vulnerability. Applying the patch 19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8/b7c7a275447c6d4bf4a36a134682e2e4e20efd4b/64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3 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 6.19.0 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 7.0-rc1 7.0-rc2 7.0-rc3 7.0-rc4 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: Memory corruption CWE: 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 6.18.20/6.19.10/7.0-rc5 Patch: 19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8/b7c7a275447c6d4bf4a36a134682e2e4e20efd4b/64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3 Timelineinfo 03/09/2026 CVE reserved 04/03/2026 +24 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-2026-31395 (🔒) GCVE (CVE): GCVE-0-2026-31395 GCVE (VulDB): GCVE-100-355166 Entryinfo Created: 04/03/2026 18:17 Changes: 04/03/2026 18:17 (60) Complete: 🔍 Cache ID: 99:768:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸