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CVE-2026-11835

Time-of-check time-of-use (TOCTOU) vulnerability combined with missing input validation in Caliptra Core ROM (UpdateResetFlow::run()) in subsystem mode allows a compromised local attacker to silently bypass secure boot by supplying an AXI staging address that is not validated against the strap-configured SS_EXTERNAL_STAGING_AREA_BASE_ADDR, enabling firmware to be modified between verification and loading into ICCM. Attestation continues to report the originally verified image digest, masking the
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:349d98017e7900d233fdc1328ed430d4f37755ee98827bb9a5be59046923d8f7
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-20","description":"CWE-20 Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:141496644b87cd1696cce42337afcc97969c22d97a7f188fc239872fc9fc0dc5 · sha256:c022bebec0fa2c71… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-367","description":"CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:141496644b87cd1696cce42337afcc97969c22d97a7f188fc239872fc9fc0dc5 · sha256:c022bebec0fa2c71… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"collectionURL":"https://github.com/chipsalliance/caliptra-sw","defaultStatus":"unaffected","modules":["UpdateResetFlow::run()"],"packageName":"Core ROM","product":"Core ROM","vendor":"Caliptra","versions":[{"lessThanOrEqual":"2.1.1","status":"affected","version":"2.1.0","versionType":"semver"},{"status":"unaffected","version":"2.1.2","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:141496644b87cd1696cce42337afcc97969c22d97a7f188fc239872fc9fc0dc5 · sha256:c022bebec0fa2c71… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":5.6,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"HIGH","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpac…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:141496644b87cd1696cce42337afcc97969c22d97a7f188fc239872fc9fc0dc5 · sha256:c022bebec0fa2c71… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-20","description":"CWE-20 Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:141496644b87cd1696cce42337afcc97969c22d97a7f188fc239872fc9fc0dc5 · sha256:c022bebec0fa2c71… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-367","description":"CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:141496644b87cd1696cce42337afcc97969c22d97a7f188fc239872fc9fc0dc5 · sha256:c022bebec0fa2c71… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"url":"https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-49mm-5gq5-v97f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:141496644b87cd1696cce42337afcc97969c22d97a7f188fc239872fc9fc0dc5 · sha256:c022bebec0fa2c71… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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