Answer in brief
CVE-2026-64370 records a Medium severity (CVSS 5.5) vulnerability in posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path. 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:2.6.12:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <afed3cdc1cca133f804fcf57ff228974f424b23a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a270b1258797f61b61da44f8bfd41a581b5c85b || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d605d00085adc3fddf67de01dc2a44aebf1a3fb5 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eb4cec29a78334d09bcfb41c0660cdd62ba05843 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7776f9226e99eb49d97492b0b445027cfcb189da || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8f06363446c5d043c9a7c008b250040e9de98cf9 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <87bd2ad568e15b90d5f7d4bcd70342d05dad649c | afed3cdc1cca133f804fcf57ff228974f424b23a, 8a270b1258797f61b61da44f8bfd41a581b5c85b, d605d00085adc3fddf67de01dc2a44aebf1a3fb5, e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0, eb4cec29a78334d09bcfb41c0660cdd62ba05843, 7776f9226e99eb49d97492b0b445027cfcb189da, 8f06363446c5d043c9a7c008b250040e9de98cf9, 87bd2ad568e15b90d5f7d4bcd70342d05dad649c |
| Linux/Linuxgeneric | 2.6.12 | 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: posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path In do_cpu_nanosleep(), posix_cpu_timer_create() takes a pid reference via get_pid() and stores it in timer.it.cpu.pid. If the subsequent posix_cpu_timer_set() call fails, the function returns immediately without calling posix_cpu_timer_del() to release the pid reference, causing a leak. Fix it by calling posix_cpu_timer_del() before the unlock-and-return on the error path, consistent with the other exit paths in the same function.
Quoted source text, attributed separately from HOL analysis.