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CVE-2026-74336 (GCVE-0-2026-74336)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:17
VLAI
Title
wifi: mac80211: bound S1G TIM PVB walk to the TIM element
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: bound S1G TIM PVB walk to the TIM element ieee80211_s1g_check_tim() parses the S1G Partial Virtual Bitmap (PVB) of a received TIM element. The TIM is handed in as the element payload: ieee802_11_parse_elems_full() stores elems->tim = elem->data and elems->tim_len = elem->datalen (net/mac80211/parse.c), so the valid bytes are [tim, tim + tim_len). When walking the encoded blocks the function passes the walker an end sentinel of (const u8 *)tim + tim_len + 2, i.e. two bytes past the end of the element. ieee80211_s1g_find_target_block() loops while (ptr + 1 <= end) and dereferences ptr (and the per-mode ieee80211_s1g_len_*() helpers read *ptr), so it can read up to two bytes beyond the TIM element -- an out-of-bounds read of adjacent skb/heap data when the TIM is the last element in the frame. The +2 appears to account for the element id/len header, but tim already points past that header at the element payload, so the addend is wrong. Pass the correct element end, (const u8 *)tim + tim_len.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e0c47c6229c25b54440fe1f84a0ff533942290b1 , < 3abc13ec3ac28c343ad7e7b7496e807b924f0edd (git)
Affected: e0c47c6229c25b54440fe1f84a0ff533942290b1 , < b224d18b1e5d1cddfc67f63f41d80023b2ec8889 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/ieee80211-s1g.h"
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            }
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: bound S1G TIM PVB walk to the TIM element\n\nieee80211_s1g_check_tim() parses the S1G Partial Virtual Bitmap (PVB) of a\nreceived TIM element. The TIM is handed in as the element payload:\nieee802_11_parse_elems_full() stores elems-\u003etim = elem-\u003edata and\nelems-\u003etim_len = elem-\u003edatalen (net/mac80211/parse.c), so the valid bytes\nare [tim, tim + tim_len).\n\nWhen walking the encoded blocks the function passes the walker an end\nsentinel of (const u8 *)tim + tim_len + 2, i.e. two bytes past the end of\nthe element. ieee80211_s1g_find_target_block() loops while (ptr + 1 \u003c= end)\nand dereferences ptr (and the per-mode ieee80211_s1g_len_*() helpers read\n*ptr), so it can read up to two bytes beyond the TIM element -- an\nout-of-bounds read of adjacent skb/heap data when the TIM is the last\nelement in the frame. The +2 appears to account for the element id/len\nheader, but tim already points past that header at the element payload, so\nthe addend is wrong.\n\nPass the correct element end, (const u8 *)tim + tim_len."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:17:27.975Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3abc13ec3ac28c343ad7e7b7496e807b924f0edd"
        },
        {
          "url": "https://git.kernel.org/stable/c/b224d18b1e5d1cddfc67f63f41d80023b2ec8889"
        }
      ],
      "title": "wifi: mac80211: bound S1G TIM PVB walk to the TIM element",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74336",
    "datePublished": "2026-08-15T05:58:27.799Z",
    "dateReserved": "2026-08-15T05:44:03.885Z",
    "dateUpdated": "2026-08-17T05:17:27.975Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74336",
      "date": "2026-09-05",
      "epss": "0.00155",
      "percentile": "0.05005"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74336\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:34.510\",\"lastModified\":\"2026-08-17T06:19:28.073\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwifi: mac80211: bound S1G TIM PVB walk to the TIM element\\n\\nieee80211_s1g_check_tim() parses the S1G Partial Virtual Bitmap (PVB) of a\\nreceived TIM element. The TIM is handed in as the element payload:\\nieee802_11_parse_elems_full() stores elems-\u003etim = elem-\u003edata and\\nelems-\u003etim_len = elem-\u003edatalen (net/mac80211/parse.c), so the valid bytes\\nare [tim, tim + tim_len).\\n\\nWhen walking the encoded blocks the function passes the walker an end\\nsentinel of (const u8 *)tim + tim_len + 2, i.e. two bytes past the end of\\nthe element. ieee80211_s1g_find_target_block() loops while (ptr + 1 \u003c= end)\\nand dereferences ptr (and the per-mode ieee80211_s1g_len_*() helpers read\\n*ptr), so it can read up to two bytes beyond the TIM element -- an\\nout-of-bounds read of adjacent skb/heap data when the TIM is the last\\nelement in the frame. The +2 appears to account for the element id/len\\nheader, but tim already points past that header at the element payload, so\\nthe addend is wrong.\\n\\nPass the correct element end, (const u8 *)tim + tim_len.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/linux/ieee80211-s1g.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e0c47c6229c25b54440fe1f84a0ff533942290b1\",\"lessThan\":\"3abc13ec3ac28c343ad7e7b7496e807b924f0edd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e0c47c6229c25b54440fe1f84a0ff533942290b1\",\"lessThan\":\"b224d18b1e5d1cddfc67f63f41d80023b2ec8889\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/linux/ieee80211-s1g.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3abc13ec3ac28c343ad7e7b7496e807b924f0edd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b224d18b1e5d1cddfc67f63f41d80023b2ec8889\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T18:16:04+00:00",
      "cve": "CVE-2026-74336",
      "id": "CVE-2026-74336",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: mac80211: bound S1G TIM PVB walk to the TIM element",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74336.json",
      "version": "3"
    }
  }
}



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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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