Answer in brief
CVE-2026-64253 records a Medium severity (CVSS 5.5) vulnerability in kernel/fork: clear PF_BLOCK_TS in copy_process(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). 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). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=06b23f92af87a84d70881b2ecaa72e00f7838264 <ee0801aceabdf583392477baf69a290b09448b8f || >=06b23f92af87a84d70881b2ecaa72e00f7838264 <99e6c712cc300883b8cbf03347d5359ec1a4d6dd || >=06b23f92af87a84d70881b2ecaa72e00f7838264 <77bba61a20f1b3d206f4f90e10a7bb3cd90b9619 || >=06b23f92af87a84d70881b2ecaa72e00f7838264 <fd38b75c4b43295b10d69772a46d1c74dbd6fc81 | ee0801aceabdf583392477baf69a290b09448b8f, 99e6c712cc300883b8cbf03347d5359ec1a4d6dd, 77bba61a20f1b3d206f4f90e10a7bb3cd90b9619, fd38b75c4b43295b10d69772a46d1c74dbd6fc81 |
| Linux/Linuxgeneric | 6.9 | Not reported |
Published upstream
Jul 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 12, 2026
In the Linux kernel, the following vulnerability has been resolved: kernel/fork: clear PF_BLOCK_TS in copy_process() PF_BLOCK_TS is only set in blk_time_get_ns() when current->plug is non-NULL, and blk_finish_plug() clears it via __blk_flush_plug() before NULLing the plug pointer. copy_process() breaks the invariant by inheriting PF_BLOCK_TS from the parent while resetting the child's plug to NULL. Clear PF_BLOCK_TS alongside that assignment so callers can rely on "PF_BLOCK_TS set implies current->plug != NULL" and dereference current->plug unguarded.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64253 records a Medium severity (CVSS 5.5) vulnerability in kernel/fork: clear PF_BLOCK_TS in copy_process(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). 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). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=06b23f92af87a84d70881b2ecaa72e00f7838264 <ee0801aceabdf583392477baf69a290b09448b8f || >=06b23f92af87a84d70881b2ecaa72e00f7838264 <99e6c712cc300883b8cbf03347d5359ec1a4d6dd || >=06b23f92af87a84d70881b2ecaa72e00f7838264 <77bba61a20f1b3d206f4f90e10a7bb3cd90b9619 || >=06b23f92af87a84d70881b2ecaa72e00f7838264 <fd38b75c4b43295b10d69772a46d1c74dbd6fc81 | ee0801aceabdf583392477baf69a290b09448b8f, 99e6c712cc300883b8cbf03347d5359ec1a4d6dd, 77bba61a20f1b3d206f4f90e10a7bb3cd90b9619, fd38b75c4b43295b10d69772a46d1c74dbd6fc81 |
| Linux/Linuxgeneric | 6.9 | Not reported |
Published upstream
Jul 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 12, 2026
In the Linux kernel, the following vulnerability has been resolved: kernel/fork: clear PF_BLOCK_TS in copy_process() PF_BLOCK_TS is only set in blk_time_get_ns() when current->plug is non-NULL, and blk_finish_plug() clears it via __blk_flush_plug() before NULLing the plug pointer. copy_process() breaks the invariant by inheriting PF_BLOCK_TS from the parent while resetting the child's plug to NULL. Clear PF_BLOCK_TS alongside that assignment so callers can rely on "PF_BLOCK_TS set implies current->plug != NULL" and dereference current->plug unguarded.
Quoted source text, attributed separately from HOL analysis.