CVE-2026-31600: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-6447-4w47-gh9g
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CVSS 7.5
CWE-476
Published
Advisory Summary

CVE-2026-31600 is a HIGH (CVSS 7.5) security vulnerability vulnerability (CWE-476: NULL Pointer Dereference) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product dereferences a pointer that it expects to be valid but is null.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-31600 at a Glance

CVE Identifier CVE-2026-31600
GHSA Identifier GHSA-6447-4w47-gh9g
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-476: NULL Pointer Dereference
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-31600

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-2026-31600, 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-476: NULL Pointer Dereference, where the product dereferences a pointer that it expects to be valid but is null. 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: arm64: mm: Handle invalid large leaf mappings correctly It has been possible for a long time to mark ptes in the linear map as invalid. This is done for secretmem, kfence, realm dma memory un/share, and others, by simply clearing the PTE_VALID bit. But until commit a166563e7ec37 ("arm64: mm: support large block mapping when rodata=full") large leaf mappings were never made invalid in this way. It turns out various parts of the code base are not equipped to handle invalid large leaf mappings (in the way they are currently encoded) and I've observed a kernel panic while booting a realm guest on a BBML2_NOABORT system as a result: [ 15.432706] software IO TLB: Memory encryption is active and system is using DMA bounce buffers [ 15.476896] Unable to handle kernel paging request at virtual address ffff000019600000 [ 15.513762] Mem abort info: [ 15.527245] ESR = 0x0000000096000046 [ 15.548553] EC = 0x25: DABT (current EL), IL = 32 bits [ 15.572146] SET = 0, FnV = 0 [ 15.592141] EA = 0, S1PTW = 0 [ 15.612694] FSC = 0x06: level 2 translation fault [ 15.640644] Data abort info: [ 15.661983] ISV = 0, ISS = 0x00000046, ISS2 = 0x00000000 [ 15.694875] CM = 0, WnR = 1, TnD = 0, TagAccess = 0 [ 15.723740] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 15.755776] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000081f3f000 [ 15.800410] [ffff000019600000] pgd=0000000000000000, p4d=180000009ffff403, pud=180000009fffe403, pmd=00e8000199600704 [ 15.855046] Internal error: Oops: 0000000096000046 [#1] SMP [ 15.886394] Modules linked in: [ 15.900029] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 7.0.0-rc4-dirty #4 PREEMPT [ 15.935258] Hardware name: linux,dummy-virt (DT) [ 15.955612] pstate: 21400005 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) [ 15.986009] pc : __pi_memcpy_generic+0x128/0x22c [ 16.006163] lr : swiotlb_bounce+0xf4/0x158 [ 16.024145] sp : ffff80008000b8f0 [ 16.038896] x29: ffff80008000b8f0 x28: 0000000000000000 x27: 0000000000000000 [ 16.069953] x26: ffffb3976d261ba8 x25: 0000000000000000 x24: ffff000019600000 [ 16.100876] x23: 0000000000000001 x22: ffff0000043430d0 x21: 0000000000007ff0 [ 16.131946] x20: 0000000084570010 x19: 0000000000000000 x18: ffff00001ffe3fcc [ 16.163073] x17: 0000000000000000 x16: 00000000003fffff x15: 646e612065766974 [ 16.194131] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [ 16.225059] x11: 0000000000000000 x10: 0000000000000010 x9 : 0000000000000018 [ 16.256113] x8 : 0000000000000018 x7 : 0000000000000000 x6 : 0000000000000000 [ 16.287203] x5 : ffff000019607ff0 x4 : ffff000004578000 x3 : ffff000019600000 [ 16.318145] x2 : 0000000000007ff0 x1 : ffff000004570010 x0 : ffff000019600000 [ 16.349071] Call trace: [ 16.360143] __pi_memcpy_generic+0x128/0x22c (P) [ 16.380310] swiotlb_tbl_map_single+0x154/0x2b4 [ 16.400282] swiotlb_map+0x5c/0x228 [ 16.415984] dma_map_phys+0x244/0x2b8 [ 16.432199] dma_map_page_attrs+0x44/0x58 [ 16.449782] virtqueue_map_page_attrs+0x38/0x44 [ 16.469596] virtqueue_map_single_attrs+0xc0/0x130 [ 16.490509] virtnet_rq_alloc.isra.0+0xa4/0x1fc [ 16.510355] try_fill_recv+0x2a4/0x584 [ 16.526989] virtnet_open+0xd4/0x238 [ 16.542775] __dev_open+0x110/0x24c [ 16.558280] __dev_change_flags+0x194/0x20c [ 16.576879] netif_change_flags+0x24/0x6c [ 16.594489] dev_change_flags+0x48/0x7c [ 16.611462] ip_auto_config+0x258/0x1114 [ 16.628727] do_one_initcall+0x80/0x1c8 [ 16.645590] kernel_init_freeable+0x208/0x2f0 [ 16.664917] kernel_init+0x24/0x1e0 [ 16.680295] ret_from_fork+0x10/0x20 [ 16.696369] Code: 927cec03 cb0e0021 8b0e0042 a9411c26 (a900340c) [ 16.723106] ---[ end trace 0000000000000000 ]--- [ 16.752866] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b [ 16.792556] Kernel Offset: 0x3396ea200000 from 0xffff8000800000 ---truncated---

References

NVD — CVE-2026-31600 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31600
git.kernel.org/stable/c/15bfba1ad7... WEB
https://git.kernel.org/stable/c/15bfba1ad77fad8e45a37aae54b3c813b33fe27c
git.kernel.org/stable/c/747b6482e4... WEB
https://git.kernel.org/stable/c/747b6482e4e227fd351197dde6f64a97107a9e52
git.kernel.org/stable/c/8140b21d19... WEB
https://git.kernel.org/stable/c/8140b21d19015227a28c255404462f2d3e6edc9a
git.kernel.org/stable/c/cbea627ea6... WEB
https://git.kernel.org/stable/c/cbea627ea634f41c79d18f0c6d20db66fa93514c

Frequently Asked Questions

What is CVE-2026-31600?
CVE-2026-31600 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-476: NULL Pointer Dereference.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-31600?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-31600?
CVE-2026-31600 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-31600?
CVE-2026-31600 is classified under CWE-476: NULL Pointer Dereference (The product dereferences a pointer that it expects to be valid but is NULL.).
How can I check Maven dependencies for CVE-2026-31600?
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-6447-4w47-gh9g",
  "modified" : "2026-04-27T15:30:45Z",
  "published" : "2026-04-24T15:32:34Z",
  "aliases" : [ "CVE-2026-31600" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: Handle invalid large leaf mappings correctly\n\nIt has been possible for a long time to mark ptes in the linear map as\ninvalid. This is done for secretmem, kfence, realm dma memory un/share,\nand others, by simply clearing the PTE_VALID bit. But until commit\na166563e7ec37 (\"arm64: mm: support large block mapping when\nrodata=full\") large leaf mappings were never made invalid in this way.\n\nIt turns out various parts of the code base are not equipped to handle\ninvalid large leaf mappings (in the way they are currently encoded) and\nI've observed a kernel panic while booting a realm guest on a\nBBML2_NOABORT system as a result:\n\n[   15.432706] software IO TLB: Memory encryption is active and system is using DMA bounce buffers\n[   15.476896] Unable to handle kernel paging request at virtual address ffff000019600000\n[   15.513762] Mem abort info:\n[   15.527245]   ESR = 0x0000000096000046\n[   15.548553]   EC = 0x25: DABT (current EL), IL = 32 bits\n[   15.572146]   SET = 0, FnV = 0\n[   15.592141]   EA = 0, S1PTW = 0\n[   15.612694]   FSC = 0x06: level 2 translation fault\n[   15.640644] Data abort info:\n[   15.661983]   ISV = 0, ISS = 0x00000046, ISS2 = 0x00000000\n[   15.694875]   CM = 0, WnR = 1, TnD = 0, TagAccess = 0\n[   15.723740]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n[   15.755776] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000081f3f000\n[   15.800410] [ffff000019600000] pgd=0000000000000000, p4d=180000009ffff403, pud=180000009fffe403, pmd=00e8000199600704\n[   15.855046] Internal error: Oops: 0000000096000046 [#1]  SMP\n[   15.886394] Modules linked in:\n[   15.900029] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 7.0.0-rc4-dirty #4 PREEMPT\n[   15.935258] Hardware name: linux,dummy-virt (DT)\n[   15.955612] pstate: 21400005 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n[   15.986009] pc : __pi_memcpy_generic+0x128/0x22c\n[   16.006163] lr : swiotlb_bounce+0xf4/0x158\n[   16.024145] sp : ffff80008000b8f0\n[   16.038896] x29: ffff80008000b8f0 x28: 0000000000000000 x27: 0000000000000000\n[   16.069953] x26: ffffb3976d261ba8 x25: 0000000000000000 x24: ffff000019600000\n[   16.100876] x23: 0000000000000001 x22: ffff0000043430d0 x21: 0000000000007ff0\n[   16.131946] x20: 0000000084570010 x19: 0000000000000000 x18: ffff00001ffe3fcc\n[   16.163073] x17: 0000000000000000 x16: 00000000003fffff x15: 646e612065766974\n[   16.194131] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\n[   16.225059] x11: 0000000000000000 x10: 0000000000000010 x9 : 0000000000000018\n[   16.256113] x8 : 0000000000000018 x7 : 0000000000000000 x6 : 0000000000000000\n[   16.287203] x5 : ffff000019607ff0 x4 : ffff000004578000 x3 : ffff000019600000\n[   16.318145] x2 : 0000000000007ff0 x1 : ffff000004570010 x0 : ffff000019600000\n[   16.349071] Call trace:\n[   16.360143]  __pi_memcpy_generic+0x128/0x22c (P)\n[   16.380310]  swiotlb_tbl_map_single+0x154/0x2b4\n[   16.400282]  swiotlb_map+0x5c/0x228\n[   16.415984]  dma_map_phys+0x244/0x2b8\n[   16.432199]  dma_map_page_attrs+0x44/0x58\n[   16.449782]  virtqueue_map_page_attrs+0x38/0x44\n[   16.469596]  virtqueue_map_single_attrs+0xc0/0x130\n[   16.490509]  virtnet_rq_alloc.isra.0+0xa4/0x1fc\n[   16.510355]  try_fill_recv+0x2a4/0x584\n[   16.526989]  virtnet_open+0xd4/0x238\n[   16.542775]  __dev_open+0x110/0x24c\n[   16.558280]  __dev_change_flags+0x194/0x20c\n[   16.576879]  netif_change_flags+0x24/0x6c\n[   16.594489]  dev_change_flags+0x48/0x7c\n[   16.611462]  ip_auto_config+0x258/0x1114\n[   16.628727]  do_one_initcall+0x80/0x1c8\n[   16.645590]  kernel_init_freeable+0x208/0x2f0\n[   16.664917]  kernel_init+0x24/0x1e0\n[   16.680295]  ret_from_fork+0x10/0x20\n[   16.696369] Code: 927cec03 cb0e0021 8b0e0042 a9411c26 (a900340c)\n[   16.723106] ---[ end trace 0000000000000000 ]---\n[   16.752866] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b\n[   16.792556] Kernel Offset: 0x3396ea200000 from 0xffff8000800000\n---truncated---",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-31600"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/15bfba1ad77fad8e45a37aae54b3c813b33fe27c"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/747b6482e4e227fd351197dde6f64a97107a9e52"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8140b21d19015227a28c255404462f2d3e6edc9a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/cbea627ea634f41c79d18f0c6d20db66fa93514c"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-476" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-04-24T15:16:38Z"
  }
}