Answer in brief
CVE-2026-64425 records a Medium severity (CVSS 5.5) vulnerability in io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=065dd936195a3466b8ebe5f9287400987ee3c063 <14b7ecad2ec56699325180a744f4b19f046401bb || >=27e47500fac23d15b7dc93ff650bc4844d2581bd <d179533c610e1b4c6aa436e3c1fd1b719d2c727c || >=d05d99573f81a091547b1778b9a50120f5d6c68a <6e2f51f3e06773c2ee98ad09738f0908b48f76f9 || >=85eb83694a91c89d9abe615d717c0053c3efa714 <ea61b04e1d7242cb37f5ed2cc91cf21a493f6597 || >=2e8ca1078b14142db2ce51cbd18ff9971560046b <b6f179a653a934736c88d820fe0098c3c2532549 || >=bdf0bf73006ea8af9327cdb85cfdff4c23a5f966 <1636d85dc139b07c0449308f2bb5e0c7a2e0da99 || >=10dc959398175736e495f71c771f8641e1ca1907 <ab85765cbe3258b43dc6729af0e6ce3a87a133d8 || >=10dc959398175736e495f71c771f8641e1ca1907 <29bef9934b2521f787bb15dd1985d4c0d12ae02a || >=5.10.253 <5.10.261 || >=5.15.203 <5.15.212 || >=6.1.167 <6.1.178 || >=6.6.122 <6.6.145 || >=6.12.68 <6.12.96 || >=6.18.8 <6.18.39 | 14b7ecad2ec56699325180a744f4b19f046401bb, d179533c610e1b4c6aa436e3c1fd1b719d2c727c, 6e2f51f3e06773c2ee98ad09738f0908b48f76f9, ea61b04e1d7242cb37f5ed2cc91cf21a493f6597, b6f179a653a934736c88d820fe0098c3c2532549, 1636d85dc139b07c0449308f2bb5e0c7a2e0da99, ab85765cbe3258b43dc6729af0e6ce3a87a133d8, 29bef9934b2521f787bb15dd1985d4c0d12ae02a, 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39 |
| Linux/Linuxgeneric | 6.19 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.