CVE-2026-64508None▾ SunlitIn 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 alloca…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 57631054fae6dcc9c892ae6310b58bbb6f6e5048 < 1fbafd5235ca897b322161659ebe8ba651b00b3bLinux >= 57631054fae6dcc9c892ae6310b58bbb6f6e5048 < 6e52c240c43a601b681e3a4e58fc5685114d4726Linux >= 57631054fae6dcc9c892ae6310b58bbb6f6e5048 < eed774da601268dae674e14d54a15e3624691f52Linux >= 57631054fae6dcc9c892ae6310b58bbb6f6e5048 < 8ff183ee4d8c452960df58175a094828c0513b2eLinux >= 57631054fae6dcc9c892ae6310b58bbb6f6e5048 < 7a6c171c6a1ac6d1509752dac131d941a3de0b37Linux >= 57631054fae6dcc9c892ae6310b58bbb6f6e5048 < 96cce16e26dd02a8678f1e87f88a4b5cdb63b995Linux 5.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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