CVE-2019-7308 — kernel/bpf/verifier

kernel/bpf/verifier.c in the Linux kernel before 4.20.6 performs undesirable out-of-bounds speculation on pointer arithmetic in various cases, including cases of different branches with different state or limits to sanitize, leading to side-channel attacks.

01What is this vulnerability?

kernel/bpf/verifier.c in the Linux kernel before 4.20.6 performs undesirable out-of-bounds speculation on pointer arithmetic in various cases, including cases of different branches with different state or limits to sanitize, leading to side-channel attacks.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-02-01T22:00:00.000Z
• Last modified: 2024-08-04T20:46:45.926Z

09References

• github.com — https://github.com/torvalds/linux/commit/979d63d50c0c0f7bc537bf821e056cc9fe5abd3…
• git.kernel.org — http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d3bd74…
• bugs.chromium.org — https://bugs.chromium.org/p/project-zero/issues/detail?id=1711
• cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.6
• git.kernel.org — http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=979d63…
• github.com — https://github.com/torvalds/linux/commit/d3bd7413e0ca40b60cf60d4003246d067cafded…
• www.securityfocus.com — http://www.securityfocus.com/bid/106827
• usn.ubuntu.com — https://usn.ubuntu.com/3930-1/
• usn.ubuntu.com — https://usn.ubuntu.com/3931-1/
• usn.ubuntu.com — https://usn.ubuntu.com/3931-2/
• usn.ubuntu.com — https://usn.ubuntu.com/3930-2/
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00052.html
• support.f5.com — https://support.f5.com/csp/article/K43030517
• support.f5.com — https://support.f5.com/csp/article/K43030517?utm_source=f5support&amp%3Butm_medi…