CVE-2022-36123 — The Linux kernel before 5

The Linux kernel before 5.18.13 lacks a certain clear operation for the block starting symbol (.bss). This allows Xen PV guest OS users to cause a denial of service or gain privileges.

01What is this vulnerability?

The Linux kernel before 5.18.13 lacks a certain clear operation for the block starting symbol (.bss). This allows Xen PV guest OS users to cause a denial of service or gain privileges.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

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: 2022-07-29T14:15:08.303
• Last modified: 2026-10-14T18:17:01.387

09References

• cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.13
• github.com — https://github.com/sickcodes/security/blob/master/advisories/SICK-2022-128.md
• github.com — https://github.com/torvalds/linux/commit/74a0032b8524ee2bd4443128c0bf9775928680b…
• github.com — https://github.com/torvalds/linux/commit/96e8fc5818686d4a1591bb6907e7fdb64ef2988…
• security.netapp.com — https://security.netapp.com/advisory/ntap-20220901-0003/
• sick.codes — https://sick.codes/sick-2022-128
• cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.13
• github.com — https://github.com/sickcodes/security/blob/master/advisories/SICK-2022-128.md
• github.com — https://github.com/torvalds/linux/commit/74a0032b8524ee2bd4443128c0bf9775928680b…
• github.com — https://github.com/torvalds/linux/commit/96e8fc5818686d4a1591bb6907e7fdb64ef2988…