Skip to content
Heist/ feed
High

staging: rtl8723bs: fix missing shared-key auth challenge length check

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-74649

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74649

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
        "lessThan": "39ae1033071001af9bb4573ebdbb43bbbe88f749",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
        "lessThan": "4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
        "lessThan": "4ba402fd47009d20e51dbfc934abb562098ea35b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
        "lessThan": "87c2f073d2aaea041d531b8e579c47570b54b3b7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
        "lessThan": "a28a4b0592e4a37ea471bc0d308513a93133ce7e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
        "lessThan": "6235b5156b48ed5d1ce3410d8f0b2fd67d30d944",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
        "lessThan": "2c56ef658ac8c6bca36bc5574715e8f717207c6c",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/staging/rtl8723bs/core/rtw_mlme_ext.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.12"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.12",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.152",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.104",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.45",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/staging/rtl8723bs/core/rtw_mlme_ext.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74649

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34258 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement