bpf: Support for hardening against JIT spraying
Summary
| CVE | CVE-2026-64508 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-25 10:17:36 UTC |
| Updated | 2026-07-27 05:16:55 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.001570000 probability, percentile 0.053080000 (date 2026-07-29)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 6e52c240c43a601b681e3a4e58fc5685114d4726 git | Not specified |
| CNA | Linux | Linux | affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 eed774da601268dae674e14d54a15e3624691f52 git | Not specified |
| CNA | Linux | Linux | affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 8ff183ee4d8c452960df58175a094828c0513b2e git | Not specified |
| CNA | Linux | Linux | affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 7a6c171c6a1ac6d1509752dac131d941a3de0b37 git | Not specified |
| CNA | Linux | Linux | affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 96cce16e26dd02a8678f1e87f88a4b5cdb63b995 git | Not specified |
| CNA | Linux | Linux | affected 5.18 | Not specified |
| CNA | Linux | Linux | unaffected 5.18 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.97 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.39 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.4 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2-rc2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/eed774da601268dae674e14d54a15e3624691f52 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/96cce16e26dd02a8678f1e87f88a4b5cdb63b995 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7a6c171c6a1ac6d1509752dac131d941a3de0b37 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8ff183ee4d8c452960df58175a094828c0513b2e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6e52c240c43a601b681e3a4e58fc5685114d4726 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.