CVE-2026-64570 (GCVE-0-2026-64570)

Vulnerability from cvelistv5 – Published: 2026-08-05 08:08 – Updated: 2026-08-05 08:08
VLAI
Title
wifi: mac80211: fix fils_discovery double free on alloc failure
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix fils_discovery double free on alloc failure ieee80211_set_fils_discovery() calls kfree_rcu() on the old template before allocating the replacement. If the kzalloc() then fails, it returns -ENOMEM while link->u.ap.fils_discovery still points at the object already queued for freeing. A later update or AP teardown (ieee80211_stop_ap()) re-queues that same rcu_head; the second free is caught by KASAN when the RCU sheaf is processed in softirq: BUG: KASAN: double-free in rcu_free_sheaf (mm/slub.c:5850) Free of addr ffff88800c065280 by task swapper/0/0 ... __rcu_free_sheaf_prepare (mm/slub.c:2634 mm/slub.c:2940) rcu_free_sheaf (mm/slub.c:5850) rcu_core (kernel/rcu/tree.c:2617 kernel/rcu/tree.c:2869) handle_softirqs (kernel/softirq.c:622) The buggy address belongs to the cache kmalloc-96 of size 96 Queue the old object for kfree_rcu() only after the new one is published, matching ieee80211_set_probe_resp() and ieee80211_set_s1g_short_beacon().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3b1c256eb4aedfc71dd97d5951ccff824b41d628 , < e2c55079155a953db669ca1986a985fa286bad95 (git)
Affected: 3b1c256eb4aedfc71dd97d5951ccff824b41d628 , < 5baaa1042f71dd4b8e418f2cdd516808702d229b (git)
Affected: 3b1c256eb4aedfc71dd97d5951ccff824b41d628 , < 1981fba71797ec95e6755fb882cad88899a2a84f (git)
Affected: 3b1c256eb4aedfc71dd97d5951ccff824b41d628 , < 286e52a799fa158bdbd77da1426c4d93f9a6e7ad (git)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc4 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/cfg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3b1c256eb4aedfc71dd97d5951ccff824b41d628",
              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
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              "versionType": "semver"
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              "version": "7.2-rc4",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "7.2-rc4",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix fils_discovery double free on alloc failure\n\nieee80211_set_fils_discovery() calls kfree_rcu() on the old template\nbefore allocating the replacement. If the kzalloc() then fails, it\nreturns -ENOMEM while link-\u003eu.ap.fils_discovery still points at the\nobject already queued for freeing. A later update or AP teardown\n(ieee80211_stop_ap()) re-queues that same rcu_head; the second free is\ncaught by KASAN when the RCU sheaf is processed in softirq:\n\n  BUG: KASAN: double-free in rcu_free_sheaf (mm/slub.c:5850)\n  Free of addr ffff88800c065280 by task swapper/0/0\n   ...\n   __rcu_free_sheaf_prepare (mm/slub.c:2634 mm/slub.c:2940)\n   rcu_free_sheaf (mm/slub.c:5850)\n   rcu_core (kernel/rcu/tree.c:2617 kernel/rcu/tree.c:2869)\n   handle_softirqs (kernel/softirq.c:622)\n  The buggy address belongs to the cache kmalloc-96 of size 96\n\nQueue the old object for kfree_rcu() only after the new one is published,\nmatching ieee80211_set_probe_resp() and ieee80211_set_s1g_short_beacon()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:08:07.855Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e2c55079155a953db669ca1986a985fa286bad95"
        },
        {
          "url": "https://git.kernel.org/stable/c/5baaa1042f71dd4b8e418f2cdd516808702d229b"
        },
        {
          "url": "https://git.kernel.org/stable/c/1981fba71797ec95e6755fb882cad88899a2a84f"
        },
        {
          "url": "https://git.kernel.org/stable/c/286e52a799fa158bdbd77da1426c4d93f9a6e7ad"
        }
      ],
      "title": "wifi: mac80211: fix fils_discovery double free on alloc failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64570",
    "datePublished": "2026-08-05T08:08:07.855Z",
    "dateReserved": "2026-07-19T15:36:31.797Z",
    "dateUpdated": "2026-08-05T08:08:07.855Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64570",
      "date": "2026-08-06",
      "epss": "0.00186",
      "percentile": "0.084"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64570\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-05T08:16:36.680\",\"lastModified\":\"2026-08-05T08:16:36.680\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwifi: mac80211: fix fils_discovery double free on alloc failure\\n\\nieee80211_set_fils_discovery() calls kfree_rcu() on the old template\\nbefore allocating the replacement. If the kzalloc() then fails, it\\nreturns -ENOMEM while link-\u003eu.ap.fils_discovery still points at the\\nobject already queued for freeing. A later update or AP teardown\\n(ieee80211_stop_ap()) re-queues that same rcu_head; the second free is\\ncaught by KASAN when the RCU sheaf is processed in softirq:\\n\\n  BUG: KASAN: double-free in rcu_free_sheaf (mm/slub.c:5850)\\n  Free of addr ffff88800c065280 by task swapper/0/0\\n   ...\\n   __rcu_free_sheaf_prepare (mm/slub.c:2634 mm/slub.c:2940)\\n   rcu_free_sheaf (mm/slub.c:5850)\\n   rcu_core (kernel/rcu/tree.c:2617 kernel/rcu/tree.c:2869)\\n   handle_softirqs (kernel/softirq.c:622)\\n  The buggy address belongs to the cache kmalloc-96 of size 96\\n\\nQueue the old object for kfree_rcu() only after the new one is published,\\nmatching ieee80211_set_probe_resp() and ieee80211_set_s1g_short_beacon().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/mac80211/cfg.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3b1c256eb4aedfc71dd97d5951ccff824b41d628\",\"lessThan\":\"e2c55079155a953db669ca1986a985fa286bad95\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3b1c256eb4aedfc71dd97d5951ccff824b41d628\",\"lessThan\":\"5baaa1042f71dd4b8e418f2cdd516808702d229b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3b1c256eb4aedfc71dd97d5951ccff824b41d628\",\"lessThan\":\"1981fba71797ec95e6755fb882cad88899a2a84f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3b1c256eb4aedfc71dd97d5951ccff824b41d628\",\"lessThan\":\"286e52a799fa158bdbd77da1426c4d93f9a6e7ad\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/mac80211/cfg.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc4\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1981fba71797ec95e6755fb882cad88899a2a84f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/286e52a799fa158bdbd77da1426c4d93f9a6e7ad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5baaa1042f71dd4b8e418f2cdd516808702d229b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2c55079155a953db669ca1986a985fa286bad95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-06T12:51:26+00:00",
      "cve": "CVE-2026-64570",
      "id": "CVE-2026-64570",
      "initial_release_date": "2026-08-05T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: mac80211: fix fils_discovery double free on alloc failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64570.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T01:06:28Z",
      "cve": "CVE-2026-64570",
      "id": "CVE-2026-64570",
      "initial_release_date": "2026-08-06T01:06:28Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64570",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64570.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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