CVE-2026-98432：Linux TCP 漏洞與修復 Prompt

Review CVE-2026-98432 for the supplied Linux kernel source tree.

Evidence:
- CVE record: https://cveawg.mitre.org/api/cve/CVE-2026-98432
- Upstream fix: e3f33b0a1d89d738e2b913dab519226eaf76e15b
- Patch: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/patch/?id=e3f33b0a1d89d738e2b913dab519226eaf76e15b

Read the evidence and the target tree before proposing changes.
If the tree, revision, configuration or vendor advisory is unavailable,
list the missing evidence and stop the patch proposal.

Trace the ownership and RCU readers of inet_opt and ireq_opt.
Check inet_sock_destruct() and tcp_v4_reqsk_destructor().
Determine whether an equivalent fix is already present.
If a backport is needed, base it on the verified upstream patch and
explain any target-branch differences. Do not invent a replacement fix.

Return:
- Evidence links and the target revision reviewed.
- Affected, fixed or undetermined status, with supporting code locations.
- A proposed diff only if the target requires it; do not apply it.
- Build, regression and RCU-lifetime checks appropriate to that tree.
- Rollback requirements and any remaining uncertainties.

Separate tests actually run from tests only proposed.
Do not claim reliable root RCE, KASLR bypass or a validated mitigation
without evidence. Do not deploy, reboot or change firewall/sysctl settings.

Audit CVE-2026-98432 in the supplied Linux kernel tree.
Verify https://cveawg.mitre.org/api/cve/CVE-2026-98432 and upstream
commit e3f33b0a1d89d738e2b913dab519226eaf76e15b first.
Check inet_sock_destruct() and tcp_v4_reqsk_destructor() for an
equivalent RCU-safe fix. Report evidence, target revision and status.
Propose a branch-specific backport only when needed and supported.
List missing inputs instead of guessing. Separate executed tests from
proposed tests. Do not apply changes, deploy or alter host settings.