CVE-2025-21655
- Source
- https://cve.org/CVERecord?id=CVE-2025-21655
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21655.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-21655
- Downstream
- Related
- Published
- 2025-01-20T13:48:40Z
- Modified
- 2026-09-09T03:30:14Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
io_eventfd_do_signal() is invoked from an RCU callback, but when dropping the reference to the io_ev_fd, it calls io_eventfd_free() directly if the refcount drops to zero. This isn't correct, as any potential freeing of the io_ev_fd should be deferred another RCU grace period.
Just call io_eventfd_put() rather than open-code the dec-and-test and free, which will correctly defer it another RCU grace period.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21655.json" }- References
-
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033
- https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10
- https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7
- https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
- https://project-zero.issues.chromium.org/issues/388499293
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21655.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-21655
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced21a091b970cdbcf3e8ff829234b51be6f9192766Fixed6b63308c28987c6010b1180c72a6db4df6c68033Fixed8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10Fixeda7085c3ae43b86d4b3d1b8275e6a67f14257e3b7Fixedc9a40292a44e78f71258b8522655bffaf5753bdb