Evidence used
- No CISA KEV confirmation is currently recorded.
BlackTreeCVE IntelligenceAuthoritative vendor disclosure · 2026
CVE-2026-53615High confidence
Ubuntu package status for CVE-2026-53615
Canonical · Ubuntu 24.04 LTS util-linux
…UnknownVendor rating
Patch only the product branches with a verified fix
Fix availability varies by productCanonical publishes a fixed Ubuntu source package. Confirm that the matching repository candidate is enabled and installable on the asset. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityUnscored→Operational priority:Needs assessment, manual assessment needed.unscored
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict local access and enforce least privilege on affected hosts.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Canonical Ubuntu 24.04 LTS util-linux and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Remediation availability differs by product scope
Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
- Debian Security Tracker: 1 affected package state with no published fix
Distribution package intelligence
5 package statesRelease-specific package status
Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Package result overrides the generic status
BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 1 affected package state shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Debian trixietrixie · source | util-linux | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.41.5-0+deb13u1 | Debian Security Tracker ↗Source updated 4 Oct 2026 |
| Debian bookwormbookworm · source | util-linux | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 4 Oct 2026 |
| Debian forkyforky · source | util-linux | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.42-1 | Debian Security Tracker ↗Source updated 4 Oct 2026 |
| Debian sidsid · source | util-linux | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.42-1 | Debian Security Tracker ↗Source updated 4 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | util-linux | Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree. | 2.39.3-9ubuntu6.6 | Canonical Ubuntu Security ↗Source updated 2 Oct 2026 |
Canonical publishes a fixed Ubuntu source package. Confirm that the matching repository candidate is enabled and installable on the asset. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Fix availability varies by product01
What, why and how
Canonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.
What
Canonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.
Why
The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.
How
An attacker operating through the affected interface may attempt exploitation when the stated preconditions are met. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
Canonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.
Why
The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.
How
An attacker operating through the affected interface may attempt exploitation when the stated preconditions are met. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- the affected interface → vulnerable operation → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Unspecified
- Privileges required
- Not stated in the selected CVSS metric
- User interaction
- Not stated in the selected CVSS metric
- Attack complexity
- Not stated in the selected CVSS metric
- Security boundary
- Not stated in the selected CVSS metric
- Weakness
?
CWE means Common Weakness Enumeration. - CWE not yet assigned
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. Not available from the selected scoring authority.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Fix availability varies by product
- Action
- Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
- Workaround
- Review the Canonical Ubuntu Security page and validate the exact release, package channel and installed package before changing the asset.
Official vendor articles1 stored document
Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.
- CVE-2026-53615 | Ubuntu →Original publisher ↗Searchable text snapshot · Captured 26 Sep 2026CVE-2026-53615 Publication date 18 June 2026 Last updated 31 August 2026 Ubuntu priority Medium Why this priority? Toggle side navigation Description [Integer Overflow or Wraparound in libblkid/src/partitions/dos.c] Status Show unmaintained releases Package Ubuntu Release Status util-linux 26.04 LTS resolute
04
Evidence and provenance
Published 23 Sept 2026 · Last source change 23 Sept 2026, 05:22 UTC · CWE not yet assigned
CVE recordCanonical Ubuntu Security · Canonical Ubuntu OVAL
CVSS sourceUnavailable
EPSS source Unavailable
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceNo official EUVD mapping
Product sourceAuthoritative vendor OVAL definition
Remediation sourceCVE/CNA references
CWE sourceUnavailable
NVD statusNVD status unavailable
Missing structured fields: official CVE record, CVSS base score, non-Ubuntu affected products. Missing data is not evidence of low risk; review the primary advisory.
Material change intelligence
View recent updates ↗What changed after publication
- Catalogue recordCVE added to the BlackTree catalogue.Authoritative vendor OVAL definition ↗
Canonical Ubuntu package evidence observed
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.