CVE-2026-64425: In the Linux kernel, the following vulnerability has been resolved: io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item commit 10dc95939817 ("io_uring/io-wq: check
In the Linux kernel, the following vulnerability has been resolved:
io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item
commit 10dc95939817 ("io_uring/io-wq: check IO_WQ_BIT_EXIT inside work
run loop") fixed the obvious case where io_worker_handle_work() took one
exit-bit snapshot before draining pending work, but the fix stops one
level too early.
io_worker_handle_work() now re-checks IO_WQ_BIT_EXIT in its outer work
run loop, yet it still snapshots that bit once before processing a whole
dependent linked-work chain. If io_wq_exit_start() sets IO_WQ_BIT_EXIT
after the first linked item has started, the remaining linked items can
still reuse stale do_kill = false, skip IO_WQ_WORK_CANCEL, and continue
running after exit has begun.
Move the check further inside, so it covers linked items too. Note: this
is a syzbot special as it loves setting up tons of slow linked work on
weird devices like msr that take forever to read, and immediately close
the ring. Exit then takes a long time.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-64425
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-644250.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-64425 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for In the Linux
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund · 2026-08-03
- high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund · 2026-08-03
- high[UPDATE] [high] Linux Kernel: Multiple Vulnerabilitiescert-bund · 2026-08-03
- medium[UPDATE] [medium] Linux Kernel: Multiple Vulnerabilitiescert-bund · 2026-08-03
- medium[NEW] [medium] Linux Kernel: Multiple vulnerabilities allow denial of servicecert-bund · 2026-08-03
- medium[NEW] [medium] Linux Kernel: Multiple vulnerabilities allow Denial of Servicecert-bund · 2026-08-03
More from NVD Recent CVEs
- unknownCVE-2026-69075: FlowIntel is affected by a stored cross-site scripting vulnerability through multiple user-con…2026-08-03
- mediumCVE-2026-63563: Sharp and Toshiba Tec MFPs (multifunction printers) for a certain market have been shipped wit…2026-08-03
- lowCVE-2026-63545: Sharp and Toshiba Tec MFPs (multifunction printers) caches data internally when printing, and …2026-08-03
- mediumCVE-2026-62416: Network Scanner Tool and Network Scanner Tool Lite provided by Sharp Corporation, with the ini…2026-08-03
- mediumCVE-2026-60011: Sharp and Toshiba Tec MFPs (multifunction printers) fail to properly authorize requests to dir…2026-08-03