{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-57899",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-57899"
  ],
  "published": "2025-01-15T13:07:18Z",
  "summary": "wifi: mac80211: fix mbss changed flags corruption on 32 bit systems",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix mbss changed flags corruption on 32 bit systems\n\nOn 32-bit systems, the size of an unsigned long is 4 bytes,\nwhile a u64 is 8 bytes. Therefore, when using\nor_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE),\nthe code is incorrectly searching for a bit in a 32-bit\nvariable that is expected to be 64 bits in size,\nleading to incorrect bit finding.\n\nSolution: Ensure that the size of the bits variable is correctly\nadjusted for each architecture.\n\n Call Trace:\n  ? show_regs+0x54/0x58\n  ? __warn+0x6b/0xd4\n  ? ieee80211_link_info_change_notify+0xcc/0xd4 [mac80211]\n  ? report_bug+0x113/0x150\n  ? exc_overflow+0x30/0x30\n  ? handle_bug+0x27/0x44\n  ? exc_invalid_op+0x18/0x50\n  ? handle_exception+0xf6/0xf6\n  ? exc_overflow+0x30/0x30\n  ? ieee80211_link_info_change_notify+0xcc/0xd4 [mac80211]\n  ? exc_overflow+0x30/0x30\n  ? ieee80211_link_info_change_notify+0xcc/0xd4 [mac80211]\n  ? ieee80211_mesh_work+0xff/0x260 [mac80211]\n  ? cfg80211_wiphy_work+0x72/0x98 [cfg80211]\n  ? process_one_work+0xf1/0x1fc\n  ? worker_thread+0x2c0/0x3b4\n  ? kthread+0xc7/0xf0\n  ? mod_delayed_work_on+0x4c/0x4c\n  ? kthread_complete_and_exit+0x14/0x14\n  ? ret_from_fork+0x24/0x38\n  ? kthread_complete_and_exit+0x14/0x14\n  ? ret_from_fork_asm+0xf/0x14\n  ? entry_INT80_32+0xf0/0xf0\n\n[restore no-op path for no changes]",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"
    }
  ],
  "affected": [
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-57899"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/86772872f9f5097cd03d0e1c6813238bd38c250b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/36b739637d7042843f9df57212ecee6ed6e0d4b2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/49dba1ded8dd5a6a12748631403240b2ab245c34"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.6,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The vulnerable function is reached from mac80211's 802.11s mesh receive paths \u2014 `ieee80211_mesh_rx_bcn_presp()` \u2192 `mesh_neighbour_update()` and `mesh_rx_plink_frame()` \u2192 `mesh_process_plink_frame()` \u2014 both driven purely by 802.11 frames transmitted by a node in radio range. WiFi frame injection is Adjacent, not Network.\nAC:L - The attacker reliably and repeatedly triggers the path by transmitting mesh beacons/probe responses or peering frames with a matching mesh ID, and the frame-parsing code (`ieee802_11_parse_elems`, `mesh_plink_fsm`) runs on the same stack region immediately beforehand, so the adjacent stack word read out-of-bounds is substantially attacker-influenced rather than beyond their control.\nPR:N - No authentication or association is required \u2014 on an open mesh (`IEEE80211_MESH_SEC_NONE`) an unauthenticated neighbour's beacon alone drives `mesh_neighbour_update()` and auto peer-link open, and mesh peering action frames are likewise processed before any credentials are verified.\nUI:N - A mesh node processes received beacons, probe responses and peering frames automatically as part of normal operation; no action by any local user or administrator is needed.\nS:U - The out-of-bounds stack read, the corrupted `mbss_changed` bitmap and the resulting bogus driver reconfiguration all occur within the kernel's own security authority, with no crossing into another security scope.\nC:L - `_find_next_bit()` reads 4 bytes of adjacent kernel stack past the 4-byte `bits` variable, disclosing leftover stack contents into the change bitmap; the read is strictly bounded to one machine word and is never copied to the attacker directly, though the leaked bits can influence externally observable driver/radio state (e.g. `BSS_CHANGED_TPE`).\nI:L - Garbage bits 32\u201363 are propagated into a u64 change mask and handed to the driver's `link_info_changed` callback, causing unintended link and hardware reconfiguration with flags that are invalid for a mesh vif; the `set_bit()` writes themselves stay within the 64-bit `mbss_changed` bitmap, so there is no arbitrary-write primitive.\nA:H - The corrupted flags reach `WARN_ON_ONCE(changed & BSS_CHANGED_VIF_CFG_FLAGS)` in `ieee80211_link_info_change_notify()` \u2014 a kernel splat that panics outright on the `panic_on_warn` configurations common in embedded/router deployments \u2014 and the same bogus flags drive drivers into unexpected reconfiguration paths, remotely and repeatedly triggerable without authentication."
    }
  }
}