Answer in brief
CVE-2026-98596 records a Unknown severity vulnerability in ipv6: Fix dst leak for uncached routes.. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=98aa546af5e4f180439c82da403cc77926d3953b <5045aa25f3790dcdb158a58ac60ccf8da42959aa || >=98aa546af5e4f180439c82da403cc77926d3953b <ed902d5546fb9c142b3216d8eec914fa1bc0aa80 || >=98aa546af5e4f180439c82da403cc77926d3953b <f9722746df13a8a29103c847ef56b02c11ce0963 || >=98aa546af5e4f180439c82da403cc77926d3953b <be31fe6333f534155e6b408f1ef6d77974bb41aa | 5045aa25f3790dcdb158a58ac60ccf8da42959aa, ed902d5546fb9c142b3216d8eec914fa1bc0aa80, f9722746df13a8a29103c847ef56b02c11ce0963, be31fe6333f534155e6b408f1ef6d77974bb41aa |
| Linux/Linuxgeneric | 6.11 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix dst leak for uncached routes. ip6_route_output_flags(), ip6_rt_put_flags(), and ip6_dst_check() detect an uncached route by list_empty(&rt->dst.rt_uncached), which replaced the static DST_NOCACHE flag check in commit a4c2fd7f7891 ("net: remove DST_NOCACHE flag"). When a device is unregistered, rt6_uncached_list_flush_dev() unlinks uncached routes tied to the device from rt6_uncached_list. Previously, they were moved to another list with list_move() (__list_del_entry() + list_add()), and since commit 98aa546af5e4 ("inet: remove (struct uncached_list)->quarantine"), the routes are just unlinked with list_del_init(). If list_del_init() runs concurrently, list_empty() evaluates to true; ip6_route_output_flags() calls dst_hold_safe() incorrectly and ip6_rt_put_flags() skips ip6_rt_put(), leaking dst, and thus dev tied via rt->from as well. The same race is partially fixed by commit 9a6f0c4d5796 ("dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()"). Let's check rt6->dst.rt_uncached_list instead. Note that IPv4 does not have the same issue.
Quoted source text, attributed separately from HOL analysis.