CVE-2026-98240

UNRATEDCVSS · not yet scoredTrending — 3 sources updated this week
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EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS v2: —Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

net: ip_tunnel: initialize options_len before referencing options

The following command triggers a kernel panic:

ip link add d0 type dummy; ip link set d0 up ip route add 10.30.0.0/16 \ encap ip id 300 geneve_opts 4660:66:11223344 dev d0

memcpy: detected buffer overflow: 4 byte write of buffer size 0 kernel BUG at lib/string_helpers.c:1044! ... ip_tun_parse_opts.part.0.cold+0x10/0x10 ip_tun_build_state+0x116/0x2a0

On kernels built with GCC 15+ and CONFIG_FORTIFY_SOURCE, the fortified memcpy() got 0 sized destination with request of 4 bytes length:

static int ip_tun_parse_opts_geneve(...) { ... attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA]; data_len = nla_len(attr); /* == 4 */

struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len; memcpy(opt->opt_data, nla_data(attr), data_len); /* ^^^^^^^^^^^^^ 0 since options_len is assigned afterwards */

Fixed by initializing the counter before the options are referenced. Matching what tunnel_key_opts_set() already does.

CVSS v3
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EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
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EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

October 6, 2026

Last Modified

October 6, 2026

References (3)

Vendor Advisories for CVE-2026-98240(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (181 versions)
  • every version up to 7.2.8-1: fixed in 7.2.8-1
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Data Freshness Timeline

(refreshed 13× in last 7d / 18× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  2. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  3. 2026-10-12 14:38 UTCEG score recompute
  4. 2026-10-11 19:10 UTCEG score recompute
  5. 2026-10-11 16:25 UTCEG score recompute
  6. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  7. 2026-10-11 13:37 UTCEG score recompute
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  9. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  10. 2026-10-09 11:27 UTCEG score recompute
  11. 2026-10-09 11:26 UTCGHSA enrichmentGHSA-2fq7-gw6w-f3qv
  12. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  14. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  15. 2026-10-06 09:47 UTCGHSA enrichmentGHSA-2fq7-gw6w-f3qv
  16. 2026-10-06 09:28 UTCNVD update
  17. 2026-10-06 08:55 UTCEG score recompute
  18. 2026-10-06 08:52 UTCMITRE cvelistV5first tracked

Frequently asked(4)

What is CVE-2026-98240?
CVE-2026-98240 is a vulnerability whose severity is not yet rated; its CVE record was published on October 6, 2026. In the Linux kernel, the following vulnerability has been resolved: net: iptunnel: initialize optionslen before referencing options The following command triggers a kernel panic: ip link add d0 type dummy; ip link set d0 up ip route add 10.30.0.0/16 \ encap ip id 300 geneve_opts 4660:66:11223344…
When was the CVE record for CVE-2026-98240 published?
The CVE record for CVE-2026-98240 was published on October 6, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 6, 2026; the record at its source may have been updated since.
Is CVE-2026-98240 actively exploited?
CVE-2026-98240 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-98240?
A fix for CVE-2026-98240 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-98240 are linked in the Vendor Advisories panel on this page.

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