CVE-2023-28772 — An issue was discovered in the Linux kernel before 5

An issue was discovered in the Linux kernel before 5.13.3. lib/seq_buf.c has a seq_buf_putmem_hex buffer overflow.

01What is this vulnerability?

An issue was discovered in the Linux kernel before 5.13.3. lib/seq_buf.c has a seq_buf_putmem_hex buffer overflow.

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: 2023-03-23T00:00:00.000Z
• Last modified: 2025-05-05T16:02:12.798Z

09References

• cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.3
• github.com — https://github.com/torvalds/linux/commit/d3b16034a24a112bb83aeb669ac5b9b01f744bb…
• lore.kernel.org — https://lore.kernel.org/lkml/20210625122453.5e2fe304%40oasis.local.home/
• lkml.kernel.org — https://lkml.kernel.org/r/20210626032156.47889-1-yun.zhou%40windriver.com
• security.netapp.com — https://security.netapp.com/advisory/ntap-20230427-0005/