DEBIAN-CVE-2026-54905
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-54905
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54905.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-54905
- Upstream
- Published
- 2026-06-24T17:17:29Z
- Modified
- 2026-09-14T17:03:20Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
- Summary
- [none]
- Details
-
concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReentrantReadWriteLock can incorrectly grant a write lock after one thread acquires the read lock 32,768 times. The lock stores a thread's local read and write hold counts in one integer. The low 15 bits are used for the read hold count, and bit 15 is used as WRITE_LOCK_HELD. After 32,768 reentrant read acquisitions, the local read count crosses into the write-lock bit. try_write_lock then treats the thread as already holding a write lock and returns true without setting the global RUNNING_WRITER bit. This breaks the core mutual-exclusion guarantee: the caller is told it has a write lock, but other threads can still hold or acquire read locks at the same time. This vulnerability is fixed in 1.3.7.
- References
Affected packages
Debian:12 / ruby-concurrent
Package
- Name
- ruby-concurrent
- Purl
- pkg:deb/debian/ruby-concurrent?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13 / ruby-concurrent
Package
- Name
- ruby-concurrent
- Purl
- pkg:deb/debian/ruby-concurrent?arch=source&distro=trixie
Debian:14 / ruby-concurrent
Package
- Name
- ruby-concurrent
- Purl
- pkg:deb/debian/ruby-concurrent?arch=source&distro=forky