7.8

CVE-2025-40169: linux

CVSS: 7.8v3.1HighDeferred
AliasesUBUNTU-CVE-2025-40169DEBIAN-CVE-2025-40169
Published 12-11-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-40169 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.15%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 30 · Related 30
OPENSUSE-SU-2025:20172-1SUSE-SU-2025:4393-1SUSE-SU-2025:4422-1SUSE-SU-2025:4505-1SUSE-SU-2025:4516-1SUSE-SU-2025:4517-1

Timeline

  1. 12-11-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject negative offsets for ALU ops When verifying BPF programs, the check_alu_op() function validates instructions with ALU operations. The 'offset' field in these instructions is a signed 16-bit integer. The existing check 'insn->off > 1' was intended to ensure the offset is either 0, or 1 for BPF_MOD/BPF_DIV. However, because 'insn->off' is signed, this check incorrectly accepts all negative values (e.g., -1). This commit tightens the validation by changing the condition to '(insn->off != 0 && insn->off != 1)'. This ensures that any value other than the explicitly permitted 0 and 1 is rejected, hardening the verifier against malformed BPF programs.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

+0.01 pp

From 0.14% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.15%

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

Ubuntu127 products
  • linux< 6.8.0-106.106 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1050.53 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.12.57-1 | < 6.17.6-1
Linux1 product
  • linux≥ ec0e2da95f72d4a46050a4d994e4fe471474fd80, < 3bce44b344040e5eef3d64d38b157c15304c0aab | ≥ ec0e2da95f72d4a46050a4d994e4fe471474fd80, < 5017c302ca4b2a45149ad64e058fa2d5623c068f | ≥ ec0e2da95f72d4a46050a4d994e4fe471474fd80, < 21167bf70dbe400563e189ac632258d35eda38b5 | ≥ ec0e2da95f72d4a46050a4d994e4fe471474fd80, < 55c0ced59fe17dee34e9dfd5f7be63cbab207758 | 6.6

3 vendors · 129 products

References

22 links
Show all 22 references