Evidence used
- No CISA KEV confirmation is currently recorded.
- Exploitation requires an existing local or physical foothold with privileges.
- EPSS is 0.53% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-34002High confidence
Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling
Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support
Official source article: Red Hat RHSA-2026:20547 ↗. Check the applicable product and release in the original source.
6.1MediumCVSS 3.1
Patch only the product branches with a verified fix
Fix availability varies by productMedium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 2 structured product or package states 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 severityMedium→Operational priority:Low, lowered one band.downgradedsince 8 Jun 2026
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 Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 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 2 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
- Debian Security Tracker: 2 affected package states with no published fix
Distribution package intelligence
12 package statesRelease-specific package status
Alpine, 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 2 affected package states 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 |
|---|---|---|---|---|
| Alpine v3.23v3.23 · community | xorg-server | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 21.1.22-r0 | Alpine Security Database ↗Source updated 11 Sep 2026 |
| Alpine v3.23v3.23 · community | xwayland | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 24.1.10-r0 | Alpine Security Database ↗Source updated 11 Sep 2026 |
| Debian trixietrixie · source | xorg-server | Vendor fix publishedDebian records a fixed source-package version for this release. | 2:21.1.16-1.3+deb13u2 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian trixietrixie · source | xwayland | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian bookwormbookworm · source | xorg-server | Vendor fix publishedDebian records a fixed source-package version for this release. | 2:21.1.7-3+deb12u12 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian bookwormbookworm · source | xwayland | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian forkyforky · source | xorg-server | Vendor fix publishedDebian records a fixed source-package version for this release. | 2:21.1.22-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian forkyforky · source | xwayland | Vendor fix publishedDebian records a fixed source-package version for this release. | 2:24.1.10-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian sidsid · source | xorg-server | Vendor fix publishedDebian records a fixed source-package version for this release. | 2:21.1.22-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian sidsid · source | xwayland | Vendor fix publishedDebian records a fixed source-package version for this release. | 2:24.1.10-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | xorg-server | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 5 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | xwayland | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 5 Oct 2026 |
Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 2 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Fix availability varies by product01
What, why and how
A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.
What
A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.
Why
The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer.
How
An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may obtain information outside the intended access boundary.
What
A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.
Why
The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer.
How
An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may obtain information outside the intended access boundary.
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
- local access → Buffer Access with Incorrect Length Value → obtain information outside the intended access boundary
- Attack surface
- Local
- Privileges required
- Low: a basic authenticated account is required
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-805 ↗
CWE-805: Buffer Access with Incorrect Length Value. The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:LCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.ALowAvailability impact: A successful attack can cause a limited loss.- Post-exploitation / living off the land
- The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
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
- Fixed
- Red Hat Enterprise Linux 10.0 Extended Update Support: 0:24.1.5-6.el10_0 < *
- Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION: 0:1.1.0-25.el6_10.16 < *
- Red Hat Enterprise Linux 7 Extended Lifecycle Support: 0:1.20.4-34.el7_9 < *, 0:1.8.0-36.el7_9.4 < *
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: 0:1.20.10-4.el8_4 < *, 0:1.11.0-8.el8_4.15 < *
- Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: 0:1.20.10-4.el8_4 < *, 0:1.11.0-8.el8_4.15 < *
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: 0:21.1.3-2.el8_6.6 < *, 0:1.20.11-7.el8_6 < *, 0:1.12.0-6.el8_6.17 < *
- Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: 0:1.12.0-6.el8_6.17 < *
- Red Hat Enterprise Linux 8.6 Telecommunications Update Service: 0:21.1.3-2.el8_6.6 < *, 0:1.20.11-7.el8_6 < *
- Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions: 0:21.1.3-2.el8_6.6 < *, 0:1.20.11-7.el8_6 < *
- Red Hat Enterprise Linux 8.8 Telecommunications Update Service: 0:21.1.3-13.el8_8 < *, 0:1.20.11-18.el8_8 < *, 0:1.12.0-15.el8_8.17 < *
- Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: 0:21.1.3-13.el8_8 < *, 0:1.20.11-18.el8_8 < *, 0:1.12.0-15.el8_8.17 < *
- Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions: 0:21.1.3-5.el9_0 < *, 0:1.20.11-13.el9_0 < *, 0:1.11.0-22.el9_0.17 < *
- Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: 0:21.1.3-10.el9_2 < *, 0:1.20.11-20.el9_2 < *, 0:1.12.0-14.el9_2.14 < *
- Red Hat Enterprise Linux 9.4 Extended Update Support: 0:1.20.11-28.el9_4 < *, 0:22.1.9-8.el9_4 < *, 0:1.13.1-8.el9_4.9 < *
- Red Hat Enterprise Linux 9.6 Extended Update Support: 0:1.20.11-33.el9_6 < *, 0:23.2.7-6.el9_6 < *, 0:1.14.1-10.el9_6 < *
- 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
- No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04
Evidence and provenance
Published 5 May 2026 · Last source change 8 Jun 2026, 03:30 UTC · CWE-805 · Buffer Access with Incorrect Length Value
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-08-14
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-27343
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD modified after enrichment
Missing structured fields: affected versions. Missing data is not evidence of low risk; review the primary advisory.
Material change intelligence
View recent updates ↗What changed after publication
No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.
CVE published
Fixed release or patch reference recorded
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.