CVE-2026-80920io_uring: defer eventfd signaling when queued from a wakeup handler
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: io_uring: defer eventfd signaling when queued from a wakeup handler io_req_local_work_add() signals the CQ ring eventfd inline when it is the one to push the first entry onto ->work_list. For DEFER_TASKRUN rings that add is frequently done from a waitqueue wakeup handler, where an arbitrary waitqueue lock is held. eventfd_signal_mask() only refuses to recurse when current->in_eventfd is set, but that bit is set by eventfd_signal_mask() itself. If the wake chain starts somewhere else, signal goes out inline and can feed back into epoll. Add IOU_F_TWQ_IN_WAKE, set it on the task_work add done from the three waitqueue callbacks, and use it to force io_eventfd_signal() down the existing call_rcu_hurry() deferral instead of signaling inline.
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 42 days later
· 42 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 21a091b970cdbcf3e8ff829234b51be6f9192766 – < d0c240f25e654442a72af5ca021a02165ccce638
- affected 21a091b970cdbcf3e8ff829234b51be6f9192766 – < 9d984451baf768ecd9e1fdad4637b729fcb2c9d5
- affected 21a091b970cdbcf3e8ff829234b51be6f9192766 – < e22f4494cc9487d326e5e3067f33dea7c1e442b2
- affected 21a091b970cdbcf3e8ff829234b51be6f9192766 – < b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f
- affected 21a091b970cdbcf3e8ff829234b51be6f9192766 – < 40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a
- affected 21a091b970cdbcf3e8ff829234b51be6f9192766 – < cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e
- affected 6.1
- unaffected < 6.1
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.114 – ≤ 6.12.*
- unaffected 6.18.49 – ≤ 6.18.*
- unaffected 7.1.11 – ≤ 7.1.*
- unaffected 7.2.1 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/d0c240f25e654442a72af5ca021a02165ccce638 (opens in a new tab)
- https://git.kernel.org/stable/c/9d984451baf768ecd9e1fdad4637b729fcb2c9d5 (opens in a new tab)
- https://git.kernel.org/stable/c/e22f4494cc9487d326e5e3067f33dea7c1e442b2 (opens in a new tab)
- https://git.kernel.org/stable/c/b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f (opens in a new tab)
- https://git.kernel.org/stable/c/40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a (opens in a new tab)
- https://git.kernel.org/stable/c/cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-75095 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80920)Record last updated .