CVE-2026-23274 | Linux Kernel up to 6.18.18/6.19.8/7.0-rc3 netfilter mod_timer uninitialized pointer (EUVD-2026-13610)

VDB-352029 · CVE-2026-23274 · EUVD-2026-13610 LINUX KERNEL UP TO 6.18.18/6.19.8/7.0-RC3 NETFILTER MOD_TIMER UNINITIALIZED POINTER HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.3 $0-$5k 2.35+ Summaryinfo A vulnerability classified as critical has been found in Linux Kernel up to 6.18.18/6.19.8/7.0-rc3. The impacted element is the function mod_timer of the component netfilter. Performing a manipulation results in uninitialized pointer. This vulnerability is cataloged as CVE-2026-23274. 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 6.18.18/6.19.8/7.0-rc3. This affects the function mod_timer of the component netfilter. The manipulation with an unknown input leads to a uninitialized pointer vulnerability. CWE is classifying the issue as CWE-824. The product accesses or uses a pointer that has not been initialized. The impact remains unknown. The summary by CVE is: In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels IDLETIMER revision 0 rules reuse existing timers by label and always call mod_timer() on timer->timer. If the label was created first by revision 1 with XT_IDLETIMER_ALARM, the object uses alarm timer semantics and timer->timer is never initialized. Reusing that object from revision 0 causes mod_timer() on an uninitialized timer_list, triggering debugobjects warnings and possible panic when panic_on_warn=1. Fix this by rejecting revision 0 rule insertion when an existing timer with the same label is of ALARM type. The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-23274 since 01/13/2026. 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 03/20/2026). Upgrading to version 6.18.19, 6.19.9 or 7.0-rc4 eliminates this vulnerability. Applying the patch f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1/f228b9ae2a7e84d1153616d8e71c4236cb1f1309/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf 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-2026-13610). 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 6.19.0 6.19.1 6.19.2 6.19.3 6.19.4 6.19.5 6.19.6 6.19.7 6.19.8 7.0-rc1 7.0-rc2 7.0-rc3 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: Uninitialized pointer CWE: CWE-824 / CWE-908 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 6.18.19/6.19.9/7.0-rc4 Patch: f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1/f228b9ae2a7e84d1153616d8e71c4236cb1f1309/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf Timelineinfo 01/13/2026 CVE reserved 03/20/2026 +66 days Advisory disclosed 03/20/2026 +0 days VulDB entry created 03/20/2026 +0 days VulDB entry last update Sourcesinfo Vendor: kernel.org Advisory: git.kernel.org Status: Confirmed CVE: CVE-2026-23274 (🔒) GCVE (CVE): GCVE-0-2026-23274 GCVE (VulDB): GCVE-100-352029 EUVD: 🔒 Entryinfo Created: 03/20/2026 09:48 Updated: 03/20/2026 10:36 Changes: 03/20/2026 09:48 (59), 03/20/2026 10:36 (1) Complete: 🔍 Cache ID: 99:B3D:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸