CVE-2026-74620: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-x4gp-7h95-w6vp
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Advisory Summary

CVE-2026-74620 is a security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-74620 at a Glance

CVE Identifier CVE-2026-74620
GHSA Identifier GHSA-x4gp-7h95-w6vp
Severity N/A
CVSS v3.1 Base Score N/A
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-74620

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-2026-74620, 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 General Security Weakness. 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/sched: act_gact, act_police: range check the fallback control action tcf_action_check_ctrlact() range checks the primary control action: if (!opcode) ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0; TC_ACT_VALUE_MAX is TC_ACT_TRAP, so kernel-internal verdicts above it cannot be set that way. But act_gact and act_police each carry a second, independent control action supplied by user space that never reaches that helper - TCA_GACT_PROB.paction and TCA_POLICE_RESULT. Both only reject TC_ACT_GOTO_CHAIN, so any other value is stored verbatim and returned verbatim from the action. In particular user space can store TC_ACT_CONSUMED, which is TC_ACT_VALUE_MAX + 1 and is deliberately not part of the UAPI value range. That verdict tells every caller the action took ownership of the skb, so nobody frees it: sch_handle_ingress(), sch_handle_egress() and tcf_qevent_handle() all deliberately skip the free for it. The result is one leaked sk_buff plus its data buffer per packet traversing the filter, unbounded, for all traffic on the chain including kernel-generated packets. Both are trivially deterministic. act_gact clamps tcfg_pval to >= 1, so with pval = 1 gact_determ() returns the fallback for every packet. act_police has no mandatory rate, so rate = 0 leaves tcfp_mtu = ~0 and tcf_police_mtu_check() always passes. TC_ACT_CONSUMED was added by commit 720f22fed81b ("net: sched: refactor reinsert action"), after both goto-chain guards were written: commit 9469f375ab09 ("net/sched: act_gact: disallow 'goto chain' on fallback control action") and commit c08f5ed5d625 ("net/sched: act_police: disallow 'goto chain' on fallback control action"). Neither guard was widened when the new verdict appeared. Factor the existing range test out of tcf_action_check_ctrlact() as tcf_action_valid() and apply it to both fallbacks. The helper cannot call tcf_action_check_ctrlact() directly because that also allocates a goto_chain, which is exactly what these two sites must not do. Reproduced on v7.2-rc6: kmemleak reports one leaked 232-byte skbuff_head_cache object plus its 704-byte data buffer per packet. With this patch both configurations are rejected with -EINVAL and kmemleak reports none.

References

NVD — CVE-2026-74620 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74620
git.kernel.org/stable/c/2e8df8c919... WEB
https://git.kernel.org/stable/c/2e8df8c9190335475a3b64a159d3efd8cdd1cb73
git.kernel.org/stable/c/5344e01179... WEB
https://git.kernel.org/stable/c/5344e01179baa37547ab29fd7b8614f83faa190c
git.kernel.org/stable/c/5f038affda... WEB
https://git.kernel.org/stable/c/5f038affdacaffedf6a85a06cf59ec0a852d36a7
git.kernel.org/stable/c/6bcb8839aa... WEB
https://git.kernel.org/stable/c/6bcb8839aa2d686964a4154650afc4db91e1c514
git.kernel.org/stable/c/725efc2ab4... WEB
https://git.kernel.org/stable/c/725efc2ab4a40affc4e285a2dc4896d103948a6c
git.kernel.org/stable/c/883b56ae58... WEB
https://git.kernel.org/stable/c/883b56ae58fe657d8497806c7059646e9ba6dbd0
git.kernel.org/stable/c/92f00f1d4d... WEB
https://git.kernel.org/stable/c/92f00f1d4d204a428b38e26fce3baee144b6955d
git.kernel.org/stable/c/efa58aeb6a... WEB
https://git.kernel.org/stable/c/efa58aeb6a99028b1fbc3ab2f31ba3a881211ad4

Frequently Asked Questions

What is CVE-2026-74620?
CVE-2026-74620 is a security vulnerability in Software classified as a security vulnerability vulnerability under General Security Weakness.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-74620?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-74620?
CVE-2026-74620 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-74620?
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-x4gp-7h95-w6vp",
  "modified" : "2026-08-23T15:33:03Z",
  "published" : "2026-08-22T18:30:27Z",
  "aliases" : [ "CVE-2026-74620" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_gact, act_police: range check the fallback control action\n\ntcf_action_check_ctrlact() range checks the primary control action:\n\n\tif (!opcode)\n\t\tret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;\n\nTC_ACT_VALUE_MAX is TC_ACT_TRAP, so kernel-internal verdicts above it\ncannot be set that way. But act_gact and act_police each carry a second,\nindependent control action supplied by user space that never reaches that\nhelper - TCA_GACT_PROB.paction and TCA_POLICE_RESULT. Both only reject\nTC_ACT_GOTO_CHAIN, so any other value is stored verbatim and returned\nverbatim from the action.\n\nIn particular user space can store TC_ACT_CONSUMED, which is\nTC_ACT_VALUE_MAX + 1 and is deliberately not part of the UAPI value\nrange. That verdict tells every caller the action took ownership of the\nskb, so nobody frees it: sch_handle_ingress(), sch_handle_egress() and\ntcf_qevent_handle() all deliberately skip the free for it. The result is\none leaked sk_buff plus its data buffer per packet traversing the filter,\nunbounded, for all traffic on the chain including kernel-generated\npackets.\n\nBoth are trivially deterministic. act_gact clamps tcfg_pval to >= 1, so\nwith pval = 1 gact_determ() returns the fallback for every packet.\nact_police has no mandatory rate, so rate = 0 leaves tcfp_mtu = ~0 and\ntcf_police_mtu_check() always passes.\n\nTC_ACT_CONSUMED was added by commit 720f22fed81b (\"net: sched: refactor\nreinsert action\"), after both goto-chain guards were written:\ncommit 9469f375ab09 (\"net/sched: act_gact: disallow 'goto chain' on\nfallback control action\") and\ncommit c08f5ed5d625 (\"net/sched: act_police: disallow 'goto chain' on\nfallback control action\"). Neither guard was widened when the new\nverdict appeared.\n\nFactor the existing range test out of tcf_action_check_ctrlact() as\ntcf_action_valid() and apply it to both fallbacks. The helper cannot call\ntcf_action_check_ctrlact() directly because that also allocates a\ngoto_chain, which is exactly what these two sites must not do.\n\nReproduced on v7.2-rc6: kmemleak reports one leaked 232-byte\nskbuff_head_cache object plus its 704-byte data buffer per packet. With\nthis patch both configurations are rejected with -EINVAL and kmemleak\nreports none.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-74620"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2e8df8c9190335475a3b64a159d3efd8cdd1cb73"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5344e01179baa37547ab29fd7b8614f83faa190c"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5f038affdacaffedf6a85a06cf59ec0a852d36a7"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6bcb8839aa2d686964a4154650afc4db91e1c514"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/725efc2ab4a40affc4e285a2dc4896d103948a6c"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/883b56ae58fe657d8497806c7059646e9ba6dbd0"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/92f00f1d4d204a428b38e26fce3baee144b6955d"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/efa58aeb6a99028b1fbc3ab2f31ba3a881211ad4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-22T16:16:34Z"
  }
}