CVE-2026-31409 | Linux Kernel up to 7.0-rc4 ksmbd ksmbd_session_lookup_all state issue (EUVD-2026-19195)

VDB-355494 · CVE-2026-31409 · EUVD-2026-19195 LINUX KERNEL UP TO 7.0-RC4 KSMBD KSMBD_SESSION_LOOKUP_ALL STATE ISSUE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.3 $0-$5k 1.83 Summaryinfo A vulnerability was found in Linux Kernel up to 7.0-rc4. It has been declared as critical. The impacted element is the function ksmbd_session_lookup_all of the component ksmbd. The manipulation results in state issue. This vulnerability is cataloged as CVE-2026-31409. There is no exploit available. It is recommended to upgrade the affected component. Detailsinfo A vulnerability, which was classified as critical, was found in Linux Kernel up to 7.0-rc4. Affected is the function ksmbd_session_lookup_all of the component ksmbd. 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: ksmbd: unset conn->binding on failed binding request When a multichannel SMB2_SESSION_SETUP request with SMB2_SESSION_REQ_FLAG_BINDING fails ksmbd sets conn->binding = true but never clears it on the error path. This leaves the connection in a binding state where all subsequent ksmbd_session_lookup_all() calls fall back to the global sessions table. This fix it by clearing conn->binding = false in the error path. The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-31409 since 03/09/2026. 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 04/06/2026). Upgrading to version 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10 or 7.0-rc5 eliminates this vulnerability. Applying the patch d073870dab8f6dadced81d13d273ff0b21cb7f4e/6ebef4a220a1ebe345de899ebb9ae394206fe921/89afe5e2dbea6e9d8e5f11324149d06fa3a4efca/9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772/6260fc85ed1298a71d24a75d01f8b2e56d489a60/282343cf8a4a5a3603b1cb0e17a7083e4a593b03 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-2026-19195). Productinfo Type Operating System Vendor Linux Name Kernel Version 6.1.166 6.6.129 6.12.0 6.12.1 6.12.2 6.12.3 6.12.4 6.12.5 6.12.6 6.12.7 6.12.8 6.12.9 6.12.10 6.12.11 6.12.12 6.12.13 6.12.14 6.12.15 6.12.16 6.12.17 6.12.18 6.12.19 6.12.20 6.12.21 6.12.22 6.12.23 6.12.24 6.12.25 6.12.26 6.12.27 6.12.28 6.12.29 6.12.30 6.12.31 6.12.32 6.12.33 6.12.34 6.12.35 6.12.36 6.12.37 6.12.38 6.12.39 6.12.40 6.12.41 6.12.42 6.12.43 6.12.44 6.12.45 6.12.46 6.12.47 6.12.48 6.12.49 6.12.50 6.12.51 6.12.52 6.12.53 6.12.54 6.12.55 6.12.56 6.12.57 6.12.58 6.12.59 6.12.60 6.12.61 6.12.62 6.12.63 6.12.64 6.12.65 6.12.66 6.12.67 6.12.68 6.12.69 6.12.70 6.12.71 6.12.72 6.12.73 6.12.74 6.12.75 6.12.76 6.12.77 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: 5.5 VulDB Meta Temp Score: 5.3 VulDB Base Score: 5.5 VulDB Temp Score: 5.3 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 6.1.167/6.6.130/6.12.78/6.18.20/6.19.10/7.0-rc5 Patch: d073870dab8f6dadced81d13d273ff0b21cb7f4e/6ebef4a220a1ebe345de899ebb9ae394206fe921/89afe5e2dbea6e9d8e5f11324149d06fa3a4efca/9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772/6260fc85ed1298a71d24a75d01f8b2e56d489a60/282343cf8a4a5a3603b1cb0e17a7083e4a593b03 Timelineinfo 03/09/2026 CVE reserved 04/06/2026 +27 days Advisory disclosed 04/06/2026 +0 days VulDB entry created 04/06/2026 +0 days VulDB entry last update Sourcesinfo Vendor: kernel.org Advisory: git.kernel.org Status: Confirmed CVE: CVE-2026-31409 (🔒) GCVE (CVE): GCVE-0-2026-31409 GCVE (VulDB): GCVE-100-355494 EUVD: 🔒 Entryinfo Created: 04/06/2026 10:20 Updated: 04/06/2026 12:30 Changes: 04/06/2026 10:20 (59), 04/06/2026 12:30 (1) Complete: 🔍 Cache ID: 99:172:101 Discussion No comments yet. 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