Answer in brief
CVE-2026-90393 records a Unknown severity vulnerability in bpf: Fix potential UAF in bpf_netns_link_update_prog. 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 | >=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <d462b5481d77ce7df8a5ff89a699386f00c9214d || >=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <bdddf3e1493ee973619c154a57071ce67f78598b || >=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <79a66fd997d4eecf17302d613194879eb32e0986 || >=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <f4ce6803df4095777191d800bebc50219b615ca0 || >=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <277168cb9d153ce8e9c3f9275670e32ae61b41d6 || >=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <bda86e9f31b9a296b6e64a51c91dc776fc9f613e || >=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7 || >=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <5c5997836381010fc5907b36bc17d3b19407e933 | d462b5481d77ce7df8a5ff89a699386f00c9214d, bdddf3e1493ee973619c154a57071ce67f78598b, 79a66fd997d4eecf17302d613194879eb32e0986, f4ce6803df4095777191d800bebc50219b615ca0, 277168cb9d153ce8e9c3f9275670e32ae61b41d6, bda86e9f31b9a296b6e64a51c91dc776fc9f613e, 923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7, 5c5997836381010fc5907b36bc17d3b19407e933 |
| Linux/Linuxgeneric | 5.8 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF in bpf_netns_link_update_prog In bpf_netns_link_update_prog, the checks for old_prog and prog type are currently performed locklessly before acquiring netns_bpf_mutex. This creates a race condition that can lead to a UAF issue. If two threads concurrently execute BPF_LINK_UPDATE on the same netns link, the following execution path can trigger a UAF: CPU0 CPU1 bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) return -EPERM; bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) ... old_prog = xchg(&link->prog, new_prog); bpf_prog_put(old_prog); if (new_prog->type != link->prog->type) <-- trigger UAF Fix this by moving the old_prog and prog->type checks inside the netns_bpf_mutex critical section. Meanwhile, use guard() to simplify lock management and avoid all the goto jumping.
Quoted source text, attributed separately from HOL analysis.