CVE-2026-90393: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-90393DEBIAN-CVE-2026-90393
Published 17-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-90393 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 12.6% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:11893-1

Timeline

  1. 17-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

0.00 pp

From 0.23% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.23%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu157 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 7f045a49fee04b5662cbdeaf0838f9322ae8c63a, < d462b5481d77ce7df8a5ff89a699386f00c9214d | ≥ 7f045a49fee04b5662cbdeaf0838f9322ae8c63a, < bdddf3e1493ee973619c154a57071ce67f78598b | ≥ 7f045a49fee04b5662cbdeaf0838f9322ae8c63a, < 79a66fd997d4eecf17302d613194879eb32e0986 | ≥ 7f045a49fee04b5662cbdeaf0838f9322ae8c63a, < f4ce6803df4095777191d800bebc50219b615ca0 | ≥ 7f045a49fee04b5662cbdeaf0838f9322ae8c63a, < 277168cb9d153ce8e9c3f9275670e32ae61b41d6 | ≥ 7f045a49fee04b5662cbdeaf0838f9322ae8c63a, < bda86e9f31b9a296b6e64a51c91dc776fc9f613e | ≥ 7f045a49fee04b5662cbdeaf0838f9322ae8c63a, < 923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7 | ≥ 7f045a49fee04b5662cbdeaf0838f9322ae8c63a, < 5c5997836381010fc5907b36bc17d3b19407e933 | 5.8

3 vendors · 160 products

References

13 links
Show all 13 references