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CVE-2026-55392

NILFS utilities through 2.3.0, fixed in commit 26efb5d, nilfs_sb_is_valid() function fails to validate s_log_block_size field in NILFS2 superblock before bit-shift operations. Attackers supplying crafted NILFS2 images trigger undefined behavior through oversized shifts or out-of-memory conditions, crashing tools like nilfs-tune and dumpseg.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:814a1e634e63fa918f84cb17c921535f1b20ce01dcee8d483573bc8029a741a3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":6.7,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:50f1674785e4ed9a12574daf74de00db858b61d2d70c0e0345e3bd4d3ed85253 · sha256:3e5f8064ffedf3b6… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:50f1674785e4ed9a12574daf74de00db858b61d2d70c0e0345e3bd4d3ed85253 · sha256:3e5f8064ffedf3b6… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:github/nilfs-dev/nilfs-utils","product":"nilfs-utils","repo":"https://github.com/nilfs-dev/nilfs-utils","vendor":"nilfs-dev","versions":[{"lessThanOrEqual":"2.3.0","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"26efb5daff0757365101035145331b0a5a85d9d9","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:50f1674785e4ed9a12574daf74de00db858b61d2d70c0e0345e3bd4d3ed85253 · sha256:3e5f8064ffedf3b6… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":6.7,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:50f1674785e4ed9a12574daf74de00db858b61d2d70c0e0345e3bd4d3ed85253 · sha256:3e5f8064ffedf3b6… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:50f1674785e4ed9a12574daf74de00db858b61d2d70c0e0345e3bd4d3ed85253 · sha256:3e5f8064ffedf3b6… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-1284","description":"Improper Validation of Specified Quantity in Input","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:50f1674785e4ed9a12574daf74de00db858b61d2d70c0e0345e3bd4d3ed85253 · sha256:3e5f8064ffedf3b6… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/nilfs-dev/nilfs-utils/commit/26efb5daff0757365101035145331b0a5a85d9d9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50f1674785e4ed9a12574daf74de00db858b61d2d70c0e0345e3bd4d3ed85253 · sha256:3e5f8064ffedf3b6… · /containers/cna/references/1
{"name":"Pull Request","tags":["issue-tracking"],"url":"https://github.com/nilfs-dev/nilfs-utils/issues/26"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50f1674785e4ed9a12574daf74de00db858b61d2d70c0e0345e3bd4d3ed85253 · sha256:3e5f8064ffedf3b6… · /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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