CVE-2026-98829: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-8w97-qwf2-rgh5
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Advisory Summary

CVE-2026-98829 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-2026-98829 at a Glance

CVE Identifier CVE-2026-98829
GHSA Identifier GHSA-8w97-qwf2-rgh5
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-2026-98829

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-2026-98829, 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: wifi: mac80211: drop oversized fragments to avoid extra_len overflow In ieee80211_rx_h_defragment(), fragment payloads are accumulated into entry->extra_len as subsequent fragments arrive: entry->extra_len += rx->skb->len; When the final fragment arrives, the head fragment is dequeued, and pskb_expand_head() is called with entry->extra_len to ensure sufficient tailroom for all queued fragments before copying: if (skb_tailroom(rx->skb) < entry->extra_len) { if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, GFP_ATOMIC))) { ... } } while ((skb = __skb_dequeue(&entry->skb_list))) { skb_put_data(rx->skb, skb->data, skb->len); dev_kfree_skb(skb); } In commit 69f132236827 ("mac80211: shrink struct ieee80211_fragment_entry"), entry->extra_len was narrowed from unsigned int to u16 in order to reduce structure memory footprint. However, an IEEE 802.11 frame sequence can contain up to 16 fragments (frag numbers 0..15). If a sequence of large fragments arrives (e.g. from a malicious peer or rogue AP), the sum of fragment lengths can exceed 65535 bytes (for example, 15 fragments of 4400 bytes total 66000 bytes). Because extra_len is a u16, this addition overflows and wraps around modulo 65536 (e.g. 66000 wraps to 464). Consequently, pskb_expand_head() allocates only the truncated amount of tailroom (or is skipped entirely if the head fragment already has >= 464 bytes of tailroom). When skb_put_data() subsequently iterates through the queued skb list, it appends the full payload into the undersized buffer, causing skb_put() to trigger skb_over_panic() and crash the kernel in softirq context. A legitimate MSDU in IEEE 802.11 is at most 2304 bytes (or up to 7935/11454 bytes for A-MSDU, which is not fragmented), well below U16_MAX. Fix this without increasing the size of struct ieee80211_fragment_entry by checking whether adding the incoming fragment length would exceed U16_MAX. If so, purge the queued fragments and drop the frame. [assign a separate drop reason]

References

NVD — CVE-2026-98829 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-98829
git.kernel.org/stable/c/5e4f350979... WEB
https://git.kernel.org/stable/c/5e4f3509793b4db2c0835340224743db680e861f
git.kernel.org/stable/c/870b8cb9ba... WEB
https://git.kernel.org/stable/c/870b8cb9baa9bd859deceb33ae158011e6ba2360
git.kernel.org/stable/c/9338b2dea7... WEB
https://git.kernel.org/stable/c/9338b2dea74cb0fc80a4c958b68e687610ba2261

Frequently Asked Questions

What is CVE-2026-98829?
CVE-2026-98829 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-2026-98829?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-98829?
CVE-2026-98829 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-98829?
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-8w97-qwf2-rgh5",
  "modified" : "2026-10-18T18:32:04Z",
  "published" : "2026-10-18T18:32:04Z",
  "aliases" : [ "CVE-2026-98829" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: drop oversized fragments to avoid extra_len overflow\n\nIn ieee80211_rx_h_defragment(), fragment payloads are accumulated into\nentry->extra_len as subsequent fragments arrive:\n\n        entry->extra_len += rx->skb->len;\n\nWhen the final fragment arrives, the head fragment is dequeued, and\npskb_expand_head() is called with entry->extra_len to ensure sufficient\ntailroom for all queued fragments before copying:\n\n        if (skb_tailroom(rx->skb) < entry->extra_len) {\n                if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,\n                                              GFP_ATOMIC))) {\n                        ...\n                }\n        }\n        while ((skb = __skb_dequeue(&entry->skb_list))) {\n                skb_put_data(rx->skb, skb->data, skb->len);\n                dev_kfree_skb(skb);\n        }\n\nIn commit 69f132236827 (\"mac80211: shrink struct\nieee80211_fragment_entry\"), entry->extra_len was narrowed from unsigned\nint to u16 in order to reduce structure memory footprint.\n\nHowever, an IEEE 802.11 frame sequence can contain up to 16 fragments\n(frag numbers 0..15). If a sequence of large fragments arrives (e.g. from\na malicious peer or rogue AP), the sum of fragment lengths can exceed\n65535 bytes (for example, 15 fragments of 4400 bytes total 66000 bytes).\nBecause extra_len is a u16, this addition overflows and wraps around\nmodulo 65536 (e.g. 66000 wraps to 464).\n\nConsequently, pskb_expand_head() allocates only the truncated amount of\ntailroom (or is skipped entirely if the head fragment already has >= 464\nbytes of tailroom). When skb_put_data() subsequently iterates through the\nqueued skb list, it appends the full payload into the undersized buffer,\ncausing skb_put() to trigger skb_over_panic() and crash the kernel in\nsoftirq context.\n\nA legitimate MSDU in IEEE 802.11 is at most 2304 bytes (or up to 7935/11454\nbytes for A-MSDU, which is not fragmented), well below U16_MAX.\n\nFix this without increasing the size of struct ieee80211_fragment_entry by\nchecking whether adding the incoming fragment length would exceed U16_MAX.\nIf so, purge the queued fragments and drop the frame.\n\n[assign a separate drop reason]",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-98829"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5e4f3509793b4db2c0835340224743db680e861f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/870b8cb9baa9bd859deceb33ae158011e6ba2360"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/9338b2dea74cb0fc80a4c958b68e687610ba2261"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-18T16:17:37Z"
  }
}