7.8

CVE-2026-74496: linux

CVSS: 7.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-74496DEBIAN-CVE-2026-74496
Published 15-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74496 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2% 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
0.13%
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 18 · Related 18
OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1SUSE-SU-2026:23528-1SUSE-SU-2026:23529-1SUSE-SU-2026:23881-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: fou: Fix use-after-free in fou_create() fou_create() publishes struct fou through sk_user_data before adding the new FOU port to the per-netns list. If fou_add_to_port_list() fails, the error path frees fou while it is still reachable through sk_user_data. A concurrent receive can then dereference the freed object in fou_from_sock(). This ordering issue was previously noted in the linked discussion. The failure is reachable when local port 0 is requested. Each socket binds to a different ephemeral port, but fou_cfg_cmp() compares the requested port 0 and reports -EALREADY once an entry already exists. Release the tunnel socket before freeing fou so sk_user_data is cleared first, and defer reclamation with kfree_rcu() to protect concurrent RCU readers. This matches the lifetime handling in fou_release().

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

+0.01 pp

From 0.12% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.13%

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

Ubuntu169 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 | < 7.1.8-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 0ee628a58d83e571f36ec9f07624d6845e420c50 | ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < a6fca682cfa2041e31aa72cc397c4a1406eb7468 | ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < b3f9c3e60aa25453774f899d25b5e61dd0bec1d5 | ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 99f4d3120b244f92e5df787152041296a2860cb5 | ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 58835985c035a8333742f829ad7e0889a082f9d3 | ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 9042867d4701728f0c6527215b11471759904d8f | ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < a28d8903bfe76089ea4bbdbff9976965f9ef8107 | ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < b14361aca6350ff7907b0e9903c7b94dc7d5d4a0 | 3.18

3 vendors · 172 products

References

13 links
Show all 13 references