CVE-2026-98196 (GCVE-0-2026-98196)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:44 – Updated: 2026-10-06 08:44
VLAI
Title
wifi: brcmsmac: fix UAF in brcms_free_timer()
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmsmac: fix UAF in brcms_free_timer() brcms_free_timer() calls brcms_del_timer() which uses the non-synchronous cancel_delayed_work() to cancel the timer's underlying delayed work. If the work callback (_brcms_timer) is already running, cancel_delayed_work() returns false without waiting, and brcms_free_timer() proceeds to kfree(t) while the callback still accesses t through container_of(). Add an explicit cancel_delayed_work_sync() after brcms_del_timer() to guarantee that any in-flight callback has completed before the timer structure is freed.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5b435de0d786869c95d1962121af0d7df2542009 , < 10eeb0b29fd7f52487c9ae573e8d79c210a0095d (git)
Affected: 5b435de0d786869c95d1962121af0d7df2542009 , < 74acccc928851f69184271832d690607877122af (git)
Affected: 5b435de0d786869c95d1962121af0d7df2542009 , < 050d2486e8ed2c0a23b87249ccd23e8072721391 (git)
Affected: 5b435de0d786869c95d1962121af0d7df2542009 , < 856dabd5f2617efb23c043be9e1b22a9e6e97c41 (git)
Affected: 5b435de0d786869c95d1962121af0d7df2542009 , < 2a4841ff0b74b495cddd31ae324e922217fc2f13 (git)
Affected: 5b435de0d786869c95d1962121af0d7df2542009 , < 1edb3ddd261e973a4d577c0547e63bfa25a8170d (git)
Affected: 5b435de0d786869c95d1962121af0d7df2542009 , < 777cb6bba59e875b16a1d8897a483a5fecfcd5d2 (git)
Affected: 5b435de0d786869c95d1962121af0d7df2542009 , < 1eeca1d5e0920fbdad6449768fd2d4364e714180 (git)
Create a notification for this product.
Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmsmac: fix UAF in brcms_free_timer()\n\nbrcms_free_timer() calls brcms_del_timer() which uses the non-synchronous\ncancel_delayed_work() to cancel the timer\u0027s underlying delayed work.  If\nthe work callback (_brcms_timer) is already running, cancel_delayed_work()\nreturns false without waiting, and brcms_free_timer() proceeds to kfree(t)\nwhile the callback still accesses t through container_of().\n\nAdd an explicit cancel_delayed_work_sync() after brcms_del_timer() to\nguarantee that any in-flight callback has completed before the timer\nstructure is freed."
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    "dateReserved": "2026-09-25T10:25:14.324Z",
    "dateUpdated": "2026-10-06T08:44:35.616Z",
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        "id": "CVE-2026-98196",
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      "current_release_date": "2026-10-08T23:36:08+00:00",
      "cve": "CVE-2026-98196",
      "id": "CVE-2026-98196",
      "initial_release_date": "2026-10-06T00:00:00+00:00",
      "product_status:known_affected": "263",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: brcmsmac: fix UAF in brcms_free_timer()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98196.json",
      "version": "3"
    },
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-08T16:50:56Z",
      "cve": "CVE-2026-98196",
      "id": "CVE-2026-98196",
      "initial_release_date": "2026-10-08T16:50:56Z",
      "product_status:known_affected": "297",
      "product_status:known_not_affected": "50",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98196",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98196.json",
      "version": "2"
    }
  }
}



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