Answer in brief
CVE-2026-64508 records a Unknown severity vulnerability in bpf: Support for hardening against JIT spraying. 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.
A CVSS score is not reported in the current record. 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.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=57631054fae6dcc9c892ae6310b58bbb6f6e5048 <6e52c240c43a601b681e3a4e58fc5685114d4726 || >=57631054fae6dcc9c892ae6310b58bbb6f6e5048 <eed774da601268dae674e14d54a15e3624691f52 || >=57631054fae6dcc9c892ae6310b58bbb6f6e5048 <8ff183ee4d8c452960df58175a094828c0513b2e || >=57631054fae6dcc9c892ae6310b58bbb6f6e5048 <7a6c171c6a1ac6d1509752dac131d941a3de0b37 || >=57631054fae6dcc9c892ae6310b58bbb6f6e5048 <96cce16e26dd02a8678f1e87f88a4b5cdb63b995 | 6e52c240c43a601b681e3a4e58fc5685114d4726, eed774da601268dae674e14d54a15e3624691f52, 8ff183ee4d8c452960df58175a094828c0513b2e, 7a6c171c6a1ac6d1509752dac131d941a3de0b37, 96cce16e26dd02a8678f1e87f88a4b5cdb63b995 |
| Linux/Linuxgeneric | 5.18 | Not reported |
Published upstream
Jul 25, 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 17, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Support for hardening against JIT spraying The BPF JIT allocator packs many small programs into larger executable allocations and reuses space within those allocations as programs are loaded and freed. When fresh code is written into space that a previous program occupied, an indirect jump into the new program can reuse a branch prediction left behind by the old one. Flush the indirect branch predictors before reusing JIT memory so that indirect jumps into a newly written program don't reuse predictions from an old program that occupied the same space. Introduce bpf_arch_pred_flush_enabled static key and bpf_arch_pred_flush static call for flushing the branch predictors on JIT memory reuse. Architectures that need a flush, can update it to a predictor flush function. By default, its a NOP and does not emit any CALL. Allocations larger than a pack are not covered by this flush. That is safe because cBPF programs (the unprivileged attack surface) are bounded well below a pack size. Issue a warning if this assumption is ever violated while the flush is active.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64508 records a Unknown severity vulnerability in bpf: Support for hardening against JIT spraying. 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.
A CVSS score is not reported in the current record. 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.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=57631054fae6dcc9c892ae6310b58bbb6f6e5048 <6e52c240c43a601b681e3a4e58fc5685114d4726 || >=57631054fae6dcc9c892ae6310b58bbb6f6e5048 <eed774da601268dae674e14d54a15e3624691f52 || >=57631054fae6dcc9c892ae6310b58bbb6f6e5048 <8ff183ee4d8c452960df58175a094828c0513b2e || >=57631054fae6dcc9c892ae6310b58bbb6f6e5048 <7a6c171c6a1ac6d1509752dac131d941a3de0b37 || >=57631054fae6dcc9c892ae6310b58bbb6f6e5048 <96cce16e26dd02a8678f1e87f88a4b5cdb63b995 | 6e52c240c43a601b681e3a4e58fc5685114d4726, eed774da601268dae674e14d54a15e3624691f52, 8ff183ee4d8c452960df58175a094828c0513b2e, 7a6c171c6a1ac6d1509752dac131d941a3de0b37, 96cce16e26dd02a8678f1e87f88a4b5cdb63b995 |
| Linux/Linuxgeneric | 5.18 | Not reported |
Published upstream
Jul 25, 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 17, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Support for hardening against JIT spraying The BPF JIT allocator packs many small programs into larger executable allocations and reuses space within those allocations as programs are loaded and freed. When fresh code is written into space that a previous program occupied, an indirect jump into the new program can reuse a branch prediction left behind by the old one. Flush the indirect branch predictors before reusing JIT memory so that indirect jumps into a newly written program don't reuse predictions from an old program that occupied the same space. Introduce bpf_arch_pred_flush_enabled static key and bpf_arch_pred_flush static call for flushing the branch predictors on JIT memory reuse. Architectures that need a flush, can update it to a predictor flush function. By default, its a NOP and does not emit any CALL. Allocations larger than a pack are not covered by this flush. That is safe because cBPF programs (the unprivileged attack surface) are bounded well below a pack size. Issue a warning if this assumption is ever violated while the flush is active.
Quoted source text, attributed separately from HOL analysis.