CVE-2026-64508 is a vulnerability in Linux Kernel
Published on July 25, 2026
bpf: Support for hardening against JIT spraying
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.
Products Associated with CVE-2026-64508
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 6e52c240c43a601b681e3a4e58fc5685114d4726 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below eed774da601268dae674e14d54a15e3624691f52 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 8ff183ee4d8c452960df58175a094828c0513b2e is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 7a6c171c6a1ac6d1509752dac131d941a3de0b37 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 96cce16e26dd02a8678f1e87f88a4b5cdb63b995 is affected.
- Before 6.6.145 is affected.
- Before 6.12.97 is affected.
- Before 6.18.39 is affected.
- Before 7.1.4 is affected.
- Version 6.6.145, <= 6.6.* is unaffected.
- Version 6.12.97, <= 6.12.* is unaffected.
- Version 6.18.39, <= 6.18.* is unaffected.
- Version 7.1.4, <= 7.1.* is unaffected.
- Version 7.2-rc2, <= * is unaffected.