8.8

CVE-2026-74649: linux

CVSS: 8.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-74649DEBIAN-CVE-2026-74649
Published 22-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74649 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.29%
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 7 · Related 6
MGASA-2026-0506USN-8875-1USN-8875-2USN-8877-1USN-8878-1USN-8879-1

Timeline

  1. 22-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix missing shared-key auth challenge length check The WEP shared-key authentication handler uses the challenge-text element's attacker-controlled length without checking it against the fixed 128-byte chg_txt buffer. In OnAuthClient() the length from rtw_get_ie() - up to 255 - is used to perform memcpy() into the 128-byte pmlmeinfo->chg_txt, so a malicious AP sending a malformed WLAN_EID_CHALLENGE element can overflow/underfill chg_txt by up to 127 bytes. It is reachable over the air, before association, during shared-key authentication. In the case of an overflow, the driver can write out of bounds. In the case of an underfill, the driver can echo stale buffer memory. The challenge text is defined to be exactly 128 octets, which is already provided as the WLAN_AUTH_CHALLENGE_LEN define; require the element to be exactly that length before use.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

0.00 pp

From 0.29% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.29%

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

Ubuntu168 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.9-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 39ae1033071001af9bb4573ebdbb43bbbe88f749 | ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722 | ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 4ba402fd47009d20e51dbfc934abb562098ea35b | ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 87c2f073d2aaea041d531b8e579c47570b54b3b7 | ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < a28a4b0592e4a37ea471bc0d308513a93133ce7e | ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 6235b5156b48ed5d1ce3410d8f0b2fd67d30d944 | ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 2c56ef658ac8c6bca36bc5574715e8f717207c6c | 4.12

3 vendors · 171 products

References

16 links
Show all 16 references