CVE-2026-31396: Software Security Vulnerability Vulnerability

HIGH

Advisory Identifier: GHSA-p6rr-6vhx-2g77

CVSS 7.8

Published 2026-04-03

Advisory Summary

CVE-2026-31396 is a HIGH (CVSS 7.8) security vulnerability vulnerability (CWE-416: Use After Free) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-31396 at a Glance

CVE Identifier CVE-2026-31396

GHSA Identifier GHSA-p6rr-6vhx-2g77

Severity HIGH

CVSS v3.1 Base Score 7.8

CWE Classification CWE-416: Use After Free

Affected Product Software

Package Ecosystem Maven

Published Date 2026-04-03

Last Updated 2026-10-15

Security Impact

CVSS: 7.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Local (AV:L)

Attack Complexity Low (AC:L)

Privileges Required Low (PR:L)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality High (C:H)

Integrity High (I:H)

Availability High (A:H)

How to Fix CVE-2026-31396

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-31396, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-416: Use After Free, where the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In the Linux kernel, the following vulnerability has been resolved: net: macb: fix use-after-free access to PTP clock PTP clock is registered on every opening of the interface and destroyed on every closing. However it may be accessed via get_ts_info ethtool call which is possible while the interface is just present in the kernel. BUG: KASAN: use-after-free in ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426 Read of size 4 at addr ffff8880194345cc by task syz.0.6/948 CPU: 1 PID: 948 Comm: syz.0.6 Not tainted 6.1.164+ #109 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xba lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x17f/0x496 mm/kasan/report.c:420 kasan_report+0xd9/0x180 mm/kasan/report.c:524 ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426 gem_get_ts_info+0x138/0x1e0 drivers/net/ethernet/cadence/macb_main.c:3349 macb_get_ts_info+0x68/0xb0 drivers/net/ethernet/cadence/macb_main.c:3371 __ethtool_get_ts_info+0x17c/0x260 net/ethtool/common.c:558 ethtool_get_ts_info net/ethtool/ioctl.c:2367 [inline] __dev_ethtool net/ethtool/ioctl.c:3017 [inline] dev_ethtool+0x2b05/0x6290 net/ethtool/ioctl.c:3095 dev_ioctl+0x637/0x1070 net/core/dev_ioctl.c:510 sock_do_ioctl+0x20d/0x2c0 net/socket.c:1215 sock_ioctl+0x577/0x6d0 net/socket.c:1320 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x18c/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 </TASK> Allocated by task 457: kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] ptp_clock_register+0x144/0x10e0 drivers/ptp/ptp_clock.c:235 gem_ptp_init+0x46f/0x930 drivers/net/ethernet/cadence/macb_ptp.c:375 macb_open+0x901/0xd10 drivers/net/ethernet/cadence/macb_main.c:2920 __dev_open+0x2ce/0x500 net/core/dev.c:1501 __dev_change_flags+0x56a/0x740 net/core/dev.c:8651 dev_change_flags+0x92/0x170 net/core/dev.c:8722 do_setlink+0xaf8/0x3a80 net/core/rtnetlink.c:2833 __rtnl_newlink+0xbf4/0x1940 net/core/rtnetlink.c:3608 rtnl_newlink+0x63/0xa0 net/core/rtnetlink.c:3655 rtnetlink_rcv_msg+0x3c6/0xed0 net/core/rtnetlink.c:6150 netlink_rcv_skb+0x15d/0x430 net/netlink/af_netlink.c:2511 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x6d7/0xa30 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x97e/0xeb0 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x14b/0x180 net/socket.c:730 __sys_sendto+0x320/0x3b0 net/socket.c:2152 __do_sys_sendto net/socket.c:2164 [inline] __se_sys_sendto net/socket.c:2160 [inline] __x64_sys_sendto+0xdc/0x1b0 net/socket.c:2160 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Freed by task 938: kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook mm/slub.c:1755 [inline] slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xbc/0x320 mm/slub.c:3700 device_release+0xa0/0x240 drivers/base/core.c:2507 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1cd/0x350 lib/kobject.c:729 put_device+0x1b/0x30 drivers/base/core.c:3805 ptp_clock_unregister+0x171/0x270 drivers/ptp/ptp_clock.c:391 gem_ptp_remove+0x4e/0x1f0 drivers/net/ethernet/cadence/macb_ptp.c:404 macb_close+0x1c8/0x270 drivers/net/ethernet/cadence/macb_main.c:2966 __dev_close_many+0x1b9/0x310 net/core/dev.c:1585 __dev_close net/core/dev.c:1597 [inline] __dev_change_flags+0x2bb/0x740 net/core/dev.c:8649 dev_change_fl ---truncated---

References

NVD — CVE-2026-31396 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-31396

cert-portal.siemens.com/productcert/html/ss... WEB

https://cert-portal.siemens.com/productcert/html/ssa-019113.html

cert-portal.siemens.com/productcert/html/ss... WEB

https://cert-portal.siemens.com/productcert/html/ssa-082556.html

cert-portal.siemens.com/productcert/html/ss... WEB

https://cert-portal.siemens.com/productcert/html/ssa-457936.html

git.kernel.org/stable/c/0bb848d8c6... WEB

https://git.kernel.org/stable/c/0bb848d8c64938024e45780f8032f1f67d3a3607

git.kernel.org/stable/c/1f4714065b... WEB

https://git.kernel.org/stable/c/1f4714065b2bcbb0a4013fd355b84b848e6cc345

git.kernel.org/stable/c/341d01087f... WEB

https://git.kernel.org/stable/c/341d01087f821aa0f165fb1ffc8bfe4e50776da7

git.kernel.org/stable/c/5653af416a... WEB

https://git.kernel.org/stable/c/5653af416a48f6c18f9626ae9df96f814f45ff34

git.kernel.org/stable/c/6b757f345e... WEB

https://git.kernel.org/stable/c/6b757f345eeea87ed5d8afd6de35b927a1a57a2f

git.kernel.org/stable/c/8820ffe097... WEB

https://git.kernel.org/stable/c/8820ffe0975fd2efbe50453e9179c8e1c33a13d3

git.kernel.org/stable/c/8da13e6d63... WEB

https://git.kernel.org/stable/c/8da13e6d63c1a97f7302d342c89c4a56a55c7015

git.kernel.org/stable/c/eb652535e9... WEB

https://git.kernel.org/stable/c/eb652535e9ec795ef5c1078f7578eaaed755268b

Frequently Asked Questions

What is CVE-2026-31396?

CVE-2026-31396 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-416: Use After Free.

Which Software versions are affected?

Affected versions include releases prior to current release patches.

What version fixes CVE-2026-31396?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

What is the CVSS score of CVE-2026-31396?

CVE-2026-31396 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

What CWE is associated with CVE-2026-31396?

CVE-2026-31396 is classified under CWE-416: Use After Free (The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.).

How can I check Maven dependencies for CVE-2026-31396?

Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-p6rr-6vhx-2g77",
  "modified" : "2026-10-15T03:35:31Z",
  "published" : "2026-04-03T18:31:23Z",
  "aliases" : [ "CVE-2026-31396" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: macb: fix use-after-free access to PTP clock\n\nPTP clock is registered on every opening of the interface and destroyed on\nevery closing.  However it may be accessed via get_ts_info ethtool call\nwhich is possible while the interface is just present in the kernel.\n\nBUG: KASAN: use-after-free in ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426\nRead of size 4 at addr ffff8880194345cc by task syz.0.6/948\n\nCPU: 1 PID: 948 Comm: syz.0.6 Not tainted 6.1.164+ #109\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x8d/0xba lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:316 [inline]\n print_report+0x17f/0x496 mm/kasan/report.c:420\n kasan_report+0xd9/0x180 mm/kasan/report.c:524\n ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426\n gem_get_ts_info+0x138/0x1e0 drivers/net/ethernet/cadence/macb_main.c:3349\n macb_get_ts_info+0x68/0xb0 drivers/net/ethernet/cadence/macb_main.c:3371\n __ethtool_get_ts_info+0x17c/0x260 net/ethtool/common.c:558\n ethtool_get_ts_info net/ethtool/ioctl.c:2367 [inline]\n __dev_ethtool net/ethtool/ioctl.c:3017 [inline]\n dev_ethtool+0x2b05/0x6290 net/ethtool/ioctl.c:3095\n dev_ioctl+0x637/0x1070 net/core/dev_ioctl.c:510\n sock_do_ioctl+0x20d/0x2c0 net/socket.c:1215\n sock_ioctl+0x577/0x6d0 net/socket.c:1320\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:870 [inline]\n __se_sys_ioctl fs/ioctl.c:856 [inline]\n __x64_sys_ioctl+0x18c/0x210 fs/ioctl.c:856\n do_syscall_x64 arch/x86/entry/common.c:46 [inline]\n do_syscall_64+0x35/0x80 arch/x86/entry/common.c:76\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n </TASK>\n\nAllocated by task 457:\n kmalloc include/linux/slab.h:563 [inline]\n kzalloc include/linux/slab.h:699 [inline]\n ptp_clock_register+0x144/0x10e0 drivers/ptp/ptp_clock.c:235\n gem_ptp_init+0x46f/0x930 drivers/net/ethernet/cadence/macb_ptp.c:375\n macb_open+0x901/0xd10 drivers/net/ethernet/cadence/macb_main.c:2920\n __dev_open+0x2ce/0x500 net/core/dev.c:1501\n __dev_change_flags+0x56a/0x740 net/core/dev.c:8651\n dev_change_flags+0x92/0x170 net/core/dev.c:8722\n do_setlink+0xaf8/0x3a80 net/core/rtnetlink.c:2833\n __rtnl_newlink+0xbf4/0x1940 net/core/rtnetlink.c:3608\n rtnl_newlink+0x63/0xa0 net/core/rtnetlink.c:3655\n rtnetlink_rcv_msg+0x3c6/0xed0 net/core/rtnetlink.c:6150\n netlink_rcv_skb+0x15d/0x430 net/netlink/af_netlink.c:2511\n netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]\n netlink_unicast+0x6d7/0xa30 net/netlink/af_netlink.c:1344\n netlink_sendmsg+0x97e/0xeb0 net/netlink/af_netlink.c:1872\n sock_sendmsg_nosec net/socket.c:718 [inline]\n __sock_sendmsg+0x14b/0x180 net/socket.c:730\n __sys_sendto+0x320/0x3b0 net/socket.c:2152\n __do_sys_sendto net/socket.c:2164 [inline]\n __se_sys_sendto net/socket.c:2160 [inline]\n __x64_sys_sendto+0xdc/0x1b0 net/socket.c:2160\n do_syscall_x64 arch/x86/entry/common.c:46 [inline]\n do_syscall_64+0x35/0x80 arch/x86/entry/common.c:76\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nFreed by task 938:\n kasan_slab_free include/linux/kasan.h:177 [inline]\n slab_free_hook mm/slub.c:1729 [inline]\n slab_free_freelist_hook mm/slub.c:1755 [inline]\n slab_free mm/slub.c:3687 [inline]\n __kmem_cache_free+0xbc/0x320 mm/slub.c:3700\n device_release+0xa0/0x240 drivers/base/core.c:2507\n kobject_cleanup lib/kobject.c:681 [inline]\n kobject_release lib/kobject.c:712 [inline]\n kref_put include/linux/kref.h:65 [inline]\n kobject_put+0x1cd/0x350 lib/kobject.c:729\n put_device+0x1b/0x30 drivers/base/core.c:3805\n ptp_clock_unregister+0x171/0x270 drivers/ptp/ptp_clock.c:391\n gem_ptp_remove+0x4e/0x1f0 drivers/net/ethernet/cadence/macb_ptp.c:404\n macb_close+0x1c8/0x270 drivers/net/ethernet/cadence/macb_main.c:2966\n __dev_close_many+0x1b9/0x310 net/core/dev.c:1585\n __dev_close net/core/dev.c:1597 [inline]\n __dev_change_flags+0x2bb/0x740 net/core/dev.c:8649\n dev_change_fl\n---truncated---",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-31396"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/0bb848d8c64938024e45780f8032f1f67d3a3607"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1f4714065b2bcbb0a4013fd355b84b848e6cc345"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/341d01087f821aa0f165fb1ffc8bfe4e50776da7"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5653af416a48f6c18f9626ae9df96f814f45ff34"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6b757f345eeea87ed5d8afd6de35b927a1a57a2f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8820ffe0975fd2efbe50453e9179c8e1c33a13d3"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8da13e6d63c1a97f7302d342c89c4a56a55c7015"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/eb652535e9ec795ef5c1078f7578eaaed755268b"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-416" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-04-03T16:16:37Z"
  }
}

CVSS V3

7.8 HIGH

Attack Vector Local (AV:L)

Attack Complexity Low (AC:L)

Privileges Required Low (PR:L)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality High (C:H)

Integrity High (I:H)

Availability High (A:H)

Vector String

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Advisory Metadata

Source ID: GHSA-p6rr-6vhx-2g77
Schema Version: 1.4.0
Published: 2026-04-03 18:31
Last Modified: 2026-10-15 03:35
Database Record File: advisories/unreviewed/2026/04/GHSA-p6rr-6vhx-2g77/GHSA-p6rr-6vhx-2g77.json