CVE-2026-64508bpf: Support for hardening against JIT spraying
- 5.5MediumCVSS base score
- 0.19%Exploitation in 30 daysEPSS · top 91% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
- 6 days later
· 6 days later
First scored
Medium 5.5
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 – < 1fbafd5235ca897b322161659ebe8ba651b00b3b
- affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 – < 6e52c240c43a601b681e3a4e58fc5685114d4726
- affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 – < eed774da601268dae674e14d54a15e3624691f52
- affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 – < 8ff183ee4d8c452960df58175a094828c0513b2e
- affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 – < 7a6c171c6a1ac6d1509752dac131d941a3de0b37
- affected 57631054fae6dcc9c892ae6310b58bbb6f6e5048 – < 96cce16e26dd02a8678f1e87f88a4b5cdb63b995
- affected 5.18
- unaffected < 5.18
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/1fbafd5235ca897b322161659ebe8ba651b00b3b (opens in a new tab)
- https://git.kernel.org/stable/c/6e52c240c43a601b681e3a4e58fc5685114d4726 (opens in a new tab)
- https://git.kernel.org/stable/c/eed774da601268dae674e14d54a15e3624691f52 (opens in a new tab)
- https://git.kernel.org/stable/c/8ff183ee4d8c452960df58175a094828c0513b2e (opens in a new tab)
- https://git.kernel.org/stable/c/7a6c171c6a1ac6d1509752dac131d941a3de0b37 (opens in a new tab)
- https://git.kernel.org/stable/c/96cce16e26dd02a8678f1e87f88a4b5cdb63b995 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48852 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64508)Record last updated .