CVE-2026-64537

UNRATEDCVSS · not yet scored
—
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:

bridge: cfm: reject invalid CCM interval at configuration time

ccm_tx_work_expired() re-arms itself via queue_delayed_work() using the configured exp_interval converted by interval_to_us(). When exp_interval is BR_CFM_CCM_INTERVAL_NONE or out of range, interval_to_us() returns 0, causing the worker to fire immediately in a tight loop that allocates skbs until OOM.

Fix this by validating exp_interval at configuration time:

  • Constrain IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL to the valid range
[BR_CFM_CCM_INTERVAL_3_3_MS, BR_CFM_CCM_INTERVAL_10_MIN] in the netlink policy so userspace cannot set an invalid value.
  • Reject starting CCM TX in br_cfm_cc_ccm_tx() when exp_interval has
not yet been configured (defaults to 0 from kzalloc).

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
—
EG Risk
—
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

July 27, 2026

Last Modified

August 17, 2026

References (7)

Vendor Advisories for CVE-2026-64537(1)

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

Affected Packages

(5 across 4 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (55 versions)6.1.180-1—
linux-6.12—6.12.100-1~deb12u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux-6.16.1.106-3~deb11u1 ... 6.1.177-1~deb11u1 (22 versions)6.1.180-1~deb11u1—
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—

Data Freshness Timeline

(refreshed 6× in last 7d / 38× 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. 2026-08-28 21:42 UTCEPSS rescore
  3. 2026-08-28 04:37 UTCGHSA enrichment
  4. 2026-08-26 14:47 UTCEPSS rescore
  5. 2026-08-25 13:49 UTCEPSS rescore
  6. 2026-08-25 10:53 UTCGHSA enrichment
  7. 2026-08-22 17:12 UTCGHSA enrichment
  8. 2026-08-21 23:49 UTCEPSS rescore
  9. 2026-08-20 22:55 UTCEPSS rescore
  10. 2026-08-19 23:24 UTCGHSA enrichment
  11. 2026-08-19 17:04 UTCEPSS rescore
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 05:42 UTCGHSA enrichment
  15. 2026-08-17 05:25 UTCNVD update
  16. 2026-08-17 05:14 UTCGHSA enrichment
  17. 2026-08-17 05:05 UTCMITRE cvelistV5
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 01:55 UTCGHSA enrichment
  20. 2026-08-15 01:30 UTCEPSS rescore
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 08:13 UTCGHSA enrichment
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-11 00:00 UTCEPSS rescore
  25. 2026-08-10 14:32 UTCGHSA enrichment
Show 23 more
  1. 2026-08-09 13:47 UTCEPSS rescore
  2. 2026-08-08 16:37 UTCEPSS rescore
  3. 2026-08-07 20:50 UTCGHSA enrichment
  4. 2026-08-06 13:47 UTCEPSS rescore
  5. 2026-08-05 19:17 UTCEPSS rescore
  6. 2026-08-05 19:17 UTCEPSS rescore
  7. 2026-08-05 03:09 UTCGHSA enrichment
  8. 2026-08-04 15:10 UTCEPSS rescore
  9. 2026-08-04 10:39 UTCEPSS rescore
  10. 2026-08-03 10:36 UTCEPSS rescore
  11. 2026-08-02 09:24 UTCGHSA enrichment
  12. 2026-08-02 02:27 UTCEPSS rescore
  13. 2026-08-01 04:16 UTCEPSS rescore
  14. 2026-07-30 16:28 UTCEPSS rescore
  15. 2026-07-30 15:43 UTCEG score recompute
  16. 2026-07-30 15:43 UTCGHSA enrichment
  17. 2026-07-30 01:30 UTCEPSS rescore
  18. 2026-07-30 01:30 UTCEPSS rescore
  19. 2026-07-28 15:37 UTCEPSS rescore
  20. 2026-07-27 21:35 UTCGHSA enrichment
  21. 2026-07-27 21:19 UTCNVD update
  22. 2026-07-27 20:34 UTCEG score recompute
  23. 2026-07-27 20:24 UTCMITRE cvelistV5first tracked

Frequently asked(4)

What is CVE-2026-64537?
CVE-2026-64537 is a publicly disclosed vulnerability published on July 27, 2026. In the Linux kernel, the following vulnerability has been resolved: bridge: cfm: reject invalid CCM interval at configuration time ccmtxworkexpired() re-arms itself via queuedelayed_work() using the configured expinterval converted by intervalto_us(). When expinterval is BRCFMCCMINTERVAL_NONE or…
When was CVE-2026-64537 disclosed?
CVE-2026-64537 was first published in the National Vulnerability Database on July 27, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64537 actively exploited?
CVE-2026-64537 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-2026-64537?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64537, 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.

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