CVE-2026-64436: Software Security Vulnerability Vulnerability

HIGH

Advisory Identifier: GHSA-rcfx-m5g2-2jgr

CVSS 7.1

Published 2026-07-25

Advisory Summary

CVE-2026-64436 is a HIGH (CVSS 7.1) security vulnerability vulnerability (CWE-125: Out-of-bounds Read) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product reads data past the end, or before the beginning, of the intended buffer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-64436 at a Glance

CVE Identifier CVE-2026-64436

GHSA Identifier GHSA-rcfx-m5g2-2jgr

Severity HIGH

CVSS v3.1 Base Score 7.1

CWE Classification CWE-125: Out-of-bounds Read

Affected Product Software

Package Ecosystem Maven

Published Date 2026-07-25

Last Updated 2026-07-27

Security Impact

CVSS: 7.1

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:N/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 None (I:N)

Availability High (A:H)

How to Fix CVE-2026-64436

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-2026-64436, 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-125: Out-of-bounds Read, where the product reads data past the end, or before the beginning, of the intended buffer. 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: af_key: initialize alg_key_len for IPComp states pfkey_msg2xfrm_state() handles the IPComp (SADB_X_SATYPE_IPCOMP) case by allocating x->calg and copying only the algorithm name: x->calg = kmalloc_obj(*x->calg); if (!x->calg) { err = -ENOMEM; goto out; } strcpy(x->calg->alg_name, a->name); x->props.calgo = sa->sadb_sa_encrypt; Unlike the authentication (x->aalg) and encryption (x->ealg) branches of the same function, the compression branch never initializes calg->alg_key_len. IPComp carries no key and the allocation only reserves sizeof(struct xfrm_algo) (i.e. no room for a key), so the field is left containing uninitialized slab data. calg->alg_key_len is later used as a length by xfrm_algo_clone() when an IPComp state is cloned during XFRM_MSG_MIGRATE: xfrm_state_migrate() xfrm_state_clone_and_setup() x->calg = xfrm_algo_clone(orig->calg); kmemdup(orig, xfrm_alg_len(orig)); where xfrm_alg_len() returns sizeof(*alg) + (alg_key_len + 7) / 8. With a non-zero garbage alg_key_len, kmemdup() reads past the end of the 68-byte calg object. Adding an IPComp SA via PF_KEY and then migrating it triggers (net-next, KASAN, init_on_alloc=0): BUG: KASAN: slab-out-of-bounds in kmemdup_noprof+0x44/0x60 Read of size 4164 at addr ff11000025a74980 by task diag2/9287 CPU: 3 UID: 0 PID: 9287 Comm: diag2 7.1.0-rc6-g903db046d557 #1 Call Trace: <TASK> dump_stack_lvl+0x10e/0x1f0 print_report+0xf7/0x600 kasan_report+0xe4/0x120 kasan_check_range+0x105/0x1b0 __asan_memcpy+0x23/0x60 kmemdup_noprof+0x44/0x60 xfrm_state_migrate+0x70a/0x1da0 xfrm_migrate+0x753/0x18a0 xfrm_do_migrate+0xb47/0xf10 xfrm_user_rcv_msg+0x411/0xb50 netlink_rcv_skb+0x158/0x420 xfrm_netlink_rcv+0x71/0x90 netlink_unicast+0x584/0x850 netlink_sendmsg+0x8b0/0xdc0 ____sys_sendmsg+0x9f7/0xb90 ___sys_sendmsg+0x134/0x1d0 __sys_sendmsg+0x16d/0x220 do_syscall_64+0x116/0x7d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> Allocated by task 9287: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 __kasan_kmalloc+0xaa/0xb0 pfkey_add+0x2652/0x2ea0 pfkey_process+0x6d0/0x830 pfkey_sendmsg+0x42c/0x850 __sys_sendto+0x461/0x4b0 __x64_sys_sendto+0xe0/0x1c0 do_syscall_64+0x116/0x7d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ff11000025a74980 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of allocated 68-byte region [ff11000025a74980, ff11000025a749c4) Depending on the uninitialized value the same field can instead request an oversized kmemdup() allocation and make the migration clone fail. The XFRM netlink path is not affected: verify_one_alg() rejects an XFRMA_ALG_COMP attribute shorter than xfrm_alg_len(), so a calg added via XFRM_MSG_NEWSA is always self-consistent. Initialize calg->alg_key_len to 0, matching the aalg/ealg branches.

References

NVD — CVE-2026-64436 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-64436

git.kernel.org/stable/c/01b9115b55... WEB

https://git.kernel.org/stable/c/01b9115b55018123ef2449ac4951f89147a8428e

git.kernel.org/stable/c/273c06b81d... WEB

https://git.kernel.org/stable/c/273c06b81d2e902b21acc801ae18c8276c8a9b69

git.kernel.org/stable/c/3f63d1752d... WEB

https://git.kernel.org/stable/c/3f63d1752d90c0e28be931a48ab5d89bc97d637d

git.kernel.org/stable/c/58e82fc3de... WEB

https://git.kernel.org/stable/c/58e82fc3dedb57b1432292504415b224fd2d6acb

git.kernel.org/stable/c/6de2a65091... WEB

https://git.kernel.org/stable/c/6de2a650917bedaaefd65b17cede83c5e2c1dedd

git.kernel.org/stable/c/cea34abc94... WEB

https://git.kernel.org/stable/c/cea34abc94b0a81e3a8b5cfb41cf45af37c2c67e

git.kernel.org/stable/c/d129c3177d... WEB

https://git.kernel.org/stable/c/d129c3177d7b1138fd5066fcc63a698b3ba415b0

git.kernel.org/stable/c/e8417353cb... WEB

https://git.kernel.org/stable/c/e8417353cbd078d10531ba3928e609c84ab09e6b

Frequently Asked Questions

What is CVE-2026-64436?

CVE-2026-64436 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-125: Out-of-bounds Read.

Which Software versions are affected?

Affected versions include releases prior to current release patches.

What version fixes CVE-2026-64436?

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

What is the CVSS score of CVE-2026-64436?

CVE-2026-64436 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

What CWE is associated with CVE-2026-64436?

CVE-2026-64436 is classified under CWE-125: Out-of-bounds Read (The product reads data past the end, or before the beginning, of the intended buffer.).

How can I check Maven dependencies for CVE-2026-64436?

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-rcfx-m5g2-2jgr",
  "modified" : "2026-07-27T06:30:37Z",
  "published" : "2026-07-25T12:31:35Z",
  "aliases" : [ "CVE-2026-64436" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: af_key: initialize alg_key_len for IPComp states\n\npfkey_msg2xfrm_state() handles the IPComp (SADB_X_SATYPE_IPCOMP) case by\nallocating x->calg and copying only the algorithm name:\n\n\tx->calg = kmalloc_obj(*x->calg);\n\tif (!x->calg) {\n\t\terr = -ENOMEM;\n\t\tgoto out;\n\t}\n\tstrcpy(x->calg->alg_name, a->name);\n\tx->props.calgo = sa->sadb_sa_encrypt;\n\nUnlike the authentication (x->aalg) and encryption (x->ealg) branches of\nthe same function, the compression branch never initializes\ncalg->alg_key_len.  IPComp carries no key and the allocation only\nreserves sizeof(struct xfrm_algo) (i.e. no room for a key), so the field\nis left containing uninitialized slab data.\n\ncalg->alg_key_len is later used as a length by xfrm_algo_clone() when an\nIPComp state is cloned during XFRM_MSG_MIGRATE:\n\n\txfrm_state_migrate()\n\t  xfrm_state_clone_and_setup()\n\t    x->calg = xfrm_algo_clone(orig->calg);\n\t      kmemdup(orig, xfrm_alg_len(orig));\n\nwhere xfrm_alg_len() returns sizeof(*alg) + (alg_key_len + 7) / 8.  With\na non-zero garbage alg_key_len, kmemdup() reads past the end of the\n68-byte calg object.  Adding an IPComp SA via PF_KEY and then migrating\nit triggers (net-next, KASAN, init_on_alloc=0):\n\n  BUG: KASAN: slab-out-of-bounds in kmemdup_noprof+0x44/0x60\n  Read of size 4164 at addr ff11000025a74980 by task diag2/9287\n  CPU: 3 UID: 0 PID: 9287 Comm: diag2 7.1.0-rc6-g903db046d557 #1\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0x10e/0x1f0\n   print_report+0xf7/0x600\n   kasan_report+0xe4/0x120\n   kasan_check_range+0x105/0x1b0\n   __asan_memcpy+0x23/0x60\n   kmemdup_noprof+0x44/0x60\n   xfrm_state_migrate+0x70a/0x1da0\n   xfrm_migrate+0x753/0x18a0\n   xfrm_do_migrate+0xb47/0xf10\n   xfrm_user_rcv_msg+0x411/0xb50\n   netlink_rcv_skb+0x158/0x420\n   xfrm_netlink_rcv+0x71/0x90\n   netlink_unicast+0x584/0x850\n   netlink_sendmsg+0x8b0/0xdc0\n   ____sys_sendmsg+0x9f7/0xb90\n   ___sys_sendmsg+0x134/0x1d0\n   __sys_sendmsg+0x16d/0x220\n   do_syscall_64+0x116/0x7d0\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n   </TASK>\n\n  Allocated by task 9287:\n   kasan_save_stack+0x33/0x60\n   kasan_save_track+0x14/0x30\n   __kasan_kmalloc+0xaa/0xb0\n   pfkey_add+0x2652/0x2ea0\n   pfkey_process+0x6d0/0x830\n   pfkey_sendmsg+0x42c/0x850\n   __sys_sendto+0x461/0x4b0\n   __x64_sys_sendto+0xe0/0x1c0\n   do_syscall_64+0x116/0x7d0\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n  The buggy address belongs to the object at ff11000025a74980\n   which belongs to the cache kmalloc-96 of size 96\n  The buggy address is located 0 bytes inside of\n   allocated 68-byte region [ff11000025a74980, ff11000025a749c4)\n\nDepending on the uninitialized value the same field can instead request\nan oversized kmemdup() allocation and make the migration clone fail.\n\nThe XFRM netlink path is not affected: verify_one_alg() rejects an\nXFRMA_ALG_COMP attribute shorter than xfrm_alg_len(), so a calg added via\nXFRM_MSG_NEWSA is always self-consistent.\n\nInitialize calg->alg_key_len to 0, matching the aalg/ealg branches.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-64436"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/01b9115b55018123ef2449ac4951f89147a8428e"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/273c06b81d2e902b21acc801ae18c8276c8a9b69"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3f63d1752d90c0e28be931a48ab5d89bc97d637d"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/58e82fc3dedb57b1432292504415b224fd2d6acb"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6de2a650917bedaaefd65b17cede83c5e2c1dedd"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/cea34abc94b0a81e3a8b5cfb41cf45af37c2c67e"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d129c3177d7b1138fd5066fcc63a698b3ba415b0"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e8417353cbd078d10531ba3928e609c84ab09e6b"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-119", "CWE-125" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-25T10:17:28Z"
  }
}

CVSS V3

7.1 HIGH