CVE-2026-64508bpf: Support for hardening against JIT spraying
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 57631054fae6dcc9c892ae6310b58bbb6f6e5048 builds before 1fbafd5235ca897b322161659ebe8ba651b00b3b; 57631054fae6dcc9c892ae6310b58bbb6f6e5048 builds before 6e52c240c43a601b681e3a4e58fc5685114d4726; from 57631054fae6dcc9c892ae6310b58bbb6f6e5048 before eed774da601268dae674e14d54a15e3624691f52; 57631054fae6dcc9c892ae6310b58bbb6f6e5048 builds before 8ff183ee4d8c452960df58175a094828c0513b2e; 57631054fae6dcc9c892ae6310b58bbb6f6e5048 builds before 7a6c171c6a1ac6d1509752dac131d941a3de0b37; 57631054fae6dcc9c892ae6310b58bbb6f6e5048 builds before 96cce16e26dd02a8678f1e87f88a4b5cdb63b995 | CNA record |
References
- https://git.kernel.org/stable/c/1fbafd5235ca897b322161659ebe8ba651b00b3b
- https://git.kernel.org/stable/c/6e52c240c43a601b681e3a4e58fc5685114d4726
- https://git.kernel.org/stable/c/eed774da601268dae674e14d54a15e3624691f52
- https://git.kernel.org/stable/c/8ff183ee4d8c452960df58175a094828c0513b2e
- https://git.kernel.org/stable/c/7a6c171c6a1ac6d1509752dac131d941a3de0b37
- https://git.kernel.org/stable/c/96cce16e26dd02a8678f1e87f88a4b5cdb63b995
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.