Guests can trigger deadlock in Linux netback driver T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] The patch for XSA-392 introduced another issue which might result in a deadlock when trying to free the SKB of a packet dropped due to the XSA-392 handling (CVE-2022-42328). Additionally when dropping packages for other reasons the same deadlock could occur in case of netpoll being active for the interface the xen-netback driver is connected to (CVE-2022-42329).

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-42329
• https://xenbits.xenproject.org/xsa/advisory-424.txt
• http://www.openwall.com/lists/oss-security/2022/12/08/2
• http://www.openwall.com/lists/oss-security/2022/12/08/3
• http://www.openwall.com/lists/oss-security/2022/12/09/2
• https://lists.debian.org/debian-lts-announce/2022/12/msg00031.html
• https://lists.debian.org/debian-lts-announce/2022/12/msg00034.html