This bug was fixed in the package dnsmasq - 2.91-0ubuntu0.22.04.1

---------------
dnsmasq (2.91-0ubuntu0.22.04.1) jammy; urgency=medium

  * New upstream release 2.91 (LP: #2138412, #2026757)
    - Security fixes:
      + Fix out-of-bounds heap read in order_qsort() (potential SIGSEGV).
      + Fix buffer overflow with overly long lease-change script names.
    - Bug fixes:
      + Fix crash when no upstream servers are defined.
      + Fix erroneous "DNSSEC validated" state with non-DNSSEC upstream servers.
      + Fix TFTP off-by-2 bug.
      + Fix handling of EDNS0 UDP packet sizes.
      + Improve behaviour with non-responsive upstream TCP DNS servers.
      + Improve handling of truncated upstream answers.
    - New features:
      + Implement DNS-0x20 encoding (--do-0x20-encode, default off).
      + Add --dhcp-option-pxe for PXE-only DHCP options, including proxy mode.
      + Support PXE proxy-DHCP and DHCP-relay simultaneously.
      + Set --fast-dns-retries by default when DNSSEC is enabled.
    - d/patches: Refresh all patches to apply on top of new upstream version.
  * d/patches/CVE-*: add Origin headers.
  * d/tests: Backport autopkgtests from Questing.

 -- Guilherme Puida Moreira <[email protected]>  Fri, 07
Aug 2026 10:25:13 -0300

** Changed in: dnsmasq (Ubuntu Jammy)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/2026757

Title:
  [SRU] dnsmasq on Ubuntu Jammy crashes on neutron-dhcp-agent updates

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