CVE-2021-26910
HIGH
7
CVSS Score
Published: February 8, 2021 at 07:56 PM UTC
Updated: June 17, 2026 at 03:43 AM UTC
2 products affected across 2 vendorsDebian LinuxFirejail
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Severity
HIGH7
Exploit prediction
EPSS 0.4%
Description
Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU race condition between a stat operation and an OverlayFS mount operation.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Debian Linux· Debiandrupal
95%v < 0.9.64.4
Affected range stops below 0.9.64.4, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (8)
Mailing Listx_refsource_MLISTExploitPatchThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2021/02/09/1x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834bx_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/netblue30/firejail/releases/tag/0.9.64.4Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2021/02/msg00015.htmlVendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202105-19x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txtVendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2021/dsa-4849CVSS
- Attack Vector
- LOCAL
- Complexity
- HIGH
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-367
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