5.7

CVE-2026-64508: linux

CVSS: 5.7v4.0MediumReceived
AliasesUBUNTU-CVE-2026-64508DEBIAN-CVE-2026-64508
Published 25-07-2026Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2026-64508 is a medium (CVSS 5.7) vulnerability in linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.7/10
010
Medium · v4.0 (OSV · Ubuntu), selected by version preference
EPSS score
0.19%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 16 · Related 14
OPENSUSE-SU-2026:11476-1RHSA-2026:81406RHSA-2026:81552USN-8726-1USN-8726-2USN-8726-3

Timeline

  1. 25-07-2026
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

+0.03 pp

From 0.16% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.100-1 | < 7.1.4-1
  • linux-6.12< 6.12.100-1~deb12u1
Linux1 product
  • linux≥ 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < 1fbafd5235ca897b322161659ebe8ba651b00b3b | ≥ 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < 6e52c240c43a601b681e3a4e58fc5685114d4726 | ≥ 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < eed774da601268dae674e14d54a15e3624691f52 | ≥ 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < 8ff183ee4d8c452960df58175a094828c0513b2e | ≥ 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < 7a6c171c6a1ac6d1509752dac131d941a3de0b37 | ≥ 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < 96cce16e26dd02a8678f1e87f88a4b5cdb63b995 | 5.18

3 vendors · 172 products

References

24 links
Show all 24 references