CVE-2026-64542

UNRATEDCVSS · not yet scoredTrending — 3 sources updated this week
—
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS v2: —Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

ipv6: ndisc: fix NULL deref in accept_untracked_na()

accept_untracked_na() re-fetches the inet6_dev with __in6_dev_get(dev) and dereferences idev->cnf.accept_untracked_na without a NULL check, even though its only caller ndisc_recv_na() already fetched and NULL-checked idev for the same device.

Both reads of dev->ip6_ptr run in the same RCU read-side critical section, but a concurrent addrconf_ifdown() can clear dev->ip6_ptr between them: lowering the MTU below IPV6_MIN_MTU calls addrconf_ifdown() without the synchronize_net() that orders the unregister path, so the re-fetch returns NULL and oopses:

BUG: KASAN: null-ptr-deref in ndisc_recv_na (net/ipv6/ndisc.c:974) Read of size 4 at addr 0000000000000364 Call Trace: ndisc_recv_na (net/ipv6/ndisc.c:974) icmpv6_rcv (net/ipv6/icmp.c:1193) ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:479) ip6_input_finish (net/ipv6/ip6_input.c:534) ip6_input (net/ipv6/ip6_input.c:545) ip6_mc_input (net/ipv6/ip6_input.c:635) ipv6_rcv (net/ipv6/ip6_input.c:351)

It is reachable by an unprivileged user via a network namespace.

Pass the caller's already validated idev instead of re-fetching it; the idev stays alive for the whole RCU critical section, so it is safe even after dev->ip6_ptr has been cleared.

CVSS v3
—
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%
EPSS %ILE
7%
KEV
Not listed

Published

July 27, 2026

Last Modified

August 19, 2026

References (6)

Vendor Advisories for CVE-2026-64542(1)

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

Affected Packages

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 7.2~rc5-1~exp1 (338 versions)——
linux-6.12—6.12.100-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.96-1 (31 versions)6.12.100-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (157 versions)7.1.5-1—

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 8× in last 7d / 53× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 23:49 UTCVendor advisory
  3. 2026-08-29 23:49 UTCGHSA enrichment
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-26 14:47 UTCEPSS rescore
  6. 2026-08-25 23:28 UTCVendor advisory
  7. 2026-08-25 23:28 UTCGHSA enrichment
  8. 2026-08-25 13:49 UTCEPSS rescore
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-22 20:24 UTCVendor advisory
  11. 2026-08-22 20:24 UTCGHSA enrichment
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-20 22:55 UTCEPSS rescore
  14. 2026-08-19 17:27 UTCVendor advisory
  15. 2026-08-19 17:27 UTCGHSA enrichment
  16. 2026-08-19 17:21 UTCNVD update
  17. 2026-08-19 17:04 UTCEPSS rescore
  18. 2026-08-19 16:57 UTCVendor advisory
  19. 2026-08-19 16:57 UTCGHSA enrichment
  20. 2026-08-19 16:43 UTCMITRE cvelistV5
  21. 2026-08-18 13:48 UTCEPSS rescore
  22. 2026-08-17 13:47 UTCEPSS rescore
  23. 2026-08-17 05:42 UTCVendor advisory
  24. 2026-08-17 05:42 UTCGHSA enrichment
  25. 2026-08-17 05:25 UTCNVD update
Show 38 more
  1. 2026-08-17 05:14 UTCVendor advisory
  2. 2026-08-17 05:14 UTCGHSA enrichment
  3. 2026-08-17 05:05 UTCMITRE cvelistV5
  4. 2026-08-16 14:56 UTCEPSS rescore
  5. 2026-08-15 22:04 UTCVendor advisory
  6. 2026-08-15 22:04 UTCGHSA enrichment
  7. 2026-08-15 01:30 UTCEPSS rescore
  8. 2026-08-13 22:00 UTCEPSS rescore
  9. 2026-08-12 19:07 UTCVendor advisory
  10. 2026-08-12 19:07 UTCGHSA enrichment
  11. 2026-08-12 13:51 UTCEPSS rescore
  12. 2026-08-11 00:00 UTCEPSS rescore
  13. 2026-08-09 16:10 UTCGHSA enrichment
  14. 2026-08-09 13:47 UTCEPSS rescore
  15. 2026-08-08 16:37 UTCEPSS rescore
  16. 2026-08-06 13:47 UTCEPSS rescore
  17. 2026-08-06 13:14 UTCGHSA enrichment
  18. 2026-08-05 19:17 UTCEPSS rescore
  19. 2026-08-05 19:17 UTCEPSS rescore
  20. 2026-08-04 15:10 UTCEPSS rescore
  21. 2026-08-04 10:39 UTCEPSS rescore
  22. 2026-08-03 10:36 UTCEPSS rescore
  23. 2026-08-03 10:26 UTCNVD update
  24. 2026-08-03 10:17 UTCGHSA enrichment
  25. 2026-08-03 10:13 UTCMITRE cvelistV5
  26. 2026-08-03 03:29 UTCGHSA enrichment
  27. 2026-08-02 02:27 UTCEPSS rescore
  28. 2026-08-01 04:16 UTCEPSS rescore
  29. 2026-07-31 00:32 UTCEG score recompute
  30. 2026-07-31 00:32 UTCGHSA enrichment
  31. 2026-07-30 16:28 UTCEPSS rescore
  32. 2026-07-30 01:30 UTCEPSS rescore
  33. 2026-07-30 01:30 UTCEPSS rescore
  34. 2026-07-28 15:37 UTCEPSS rescore
  35. 2026-07-27 21:35 UTCGHSA enrichment
  36. 2026-07-27 21:19 UTCNVD update
  37. 2026-07-27 20:34 UTCEG score recompute
  38. 2026-07-27 20:24 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2026-64542?
CVE-2026-64542 is a publicly disclosed vulnerability published on July 27, 2026. In the Linux kernel, the following vulnerability has been resolved: ipv6: ndisc: fix NULL deref in acceptuntrackedna() acceptuntrackedna() re-fetches the inet6dev with in6dev_get(dev) and dereferences idev->cnf.acceptuntrackedna without a NULL check, even though its only caller ndiscrecvna()…
When was CVE-2026-64542 disclosed?
CVE-2026-64542 was first published in the National Vulnerability Database on July 27, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64542 actively exploited?
CVE-2026-64542 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 93.2% of all scored CVEs.
How do I remediate CVE-2026-64542?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64542, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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