CVE-2025-39761 (GCVE-0-2025-39761)
Vulnerability from cvelistv5
Published
2025-09-11 16:52
Modified
2026-08-05 12:05
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: Decrement TID on RX peer frag setup error handling Currently, TID is not decremented before peer cleanup, during error handling path of ath12k_dp_rx_peer_frag_setup(). This could lead to out-of-bounds access in peer->rx_tid[]. Hence, add a decrement operation for TID, before peer cleanup to ensures proper cleanup and prevents out-of-bounds access issues when the RX peer frag setup fails. Found during code review. Compile tested only.
References
Impacted products
Vendor Product Version
Linux Linux Version: d889913205cf7ebda905b1e62c5867ed4e39f6c2
Version: d889913205cf7ebda905b1e62c5867ed4e39f6c2
Version: d889913205cf7ebda905b1e62c5867ed4e39f6c2
Version: d889913205cf7ebda905b1e62c5867ed4e39f6c2
Version: d889913205cf7ebda905b1e62c5867ed4e39f6c2
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath12k/dp.c"
          ],
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath12k/dp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.3"
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "6.15.11",
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            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.103",
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.12.43",
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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: ath12k: Decrement TID on RX peer frag setup error handling\n\nCurrently, TID is not decremented before peer cleanup, during error\nhandling path of ath12k_dp_rx_peer_frag_setup(). This could lead to\nout-of-bounds access in peer-\u003erx_tid[].\n\nHence, add a decrement operation for TID, before peer cleanup to\nensures proper cleanup and prevents out-of-bounds access issues when\nthe RX peer frag setup fails.\n\nFound during code review. Compile tested only."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The vulnerable path is entered from `ath12k_mac_station_add()` when a WiFi peer is added, which in AP/mesh mode is driven by a station within radio range sending Authentication/peering frames. This requires adjacency on the 802.11 link, not routable network access.\nAC:L - The attacker drives both the trigger and the failure condition \u2014 repeated association/deauthentication floods create the peer-unmap race that makes `ath12k_dp_rx_peer_frag_setup()` return -ENOENT, and the same flood (17 DMA queue buffers plus a peer struct per station, up to 2048 peers) creates the memory pressure that fails `crypto_alloc_shash()`. Both sides of the race are attacker-controlled, and the attempt can be repeated indefinitely at no cost.\nPR:N - In AP and mesh mode the `NOTEXIST -\u003e NONE` sta_state transition occurs on receipt of an Authentication/peering frame, before the 4-way handshake verifies any credentials, so an unauthenticated station reaches `ath12k_dp_peer_setup()`. On open networks no credentials exist at all.\nUI:N - An attacking station associates with the ath12k AP on its own initiative; no action by any local user or administrator is needed.\nS:U - The out-of-bounds read, the `kfree()` of an OOB-derived pointer, and the REO LUT corruption all occur within the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - `ath12k_dp_rx_peer_tid_delete()` reads a full 128-byte `ath12k_dp_rx_tid` at `peer-\u003erx_tid[17]`, 72 bytes of which lie past the end of the 2312-byte allocation in un-zeroed kmalloc-4096 slack, and copies it into a REO command element. The read is unbounded stale-slab content, not a few bounded bytes, and the recovered pointer/DMA-address values feed further driver operations.\nI:H - The path performs an out-of-bounds write (`rx_tid-\u003eactive = false` clobbers `peer-\u003emcast_keyidx`, the index used to select the group decryption key at `mac.c:8144`), zeroes another peer\u0027s TID-0 entry in the hardware-shared REO LUT at index `peer_id*17 + 17` (or writes 8 bytes past the LUT at `DP_MAX_PEER_ID`), and reaches `kfree()` on a pointer read from groomable slab slack \u2014 an arbitrary-free primitive leveragable for heap corruption and control-flow hijack.\nA:H - `kfree()` of a garbage pointer and `dma_unmap_single()` with a bogus address and size cause slab-corruption panics and IOMMU faults, while zeroing another station\u0027s REO queue address in a table the WiFi hardware reads breaks that peer\u0027s RX path and can wedge the firmware, all triggerable repeatedly by an unauthenticated nearby station."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:05:01.054Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/eb1e1526b82b8cf31f1ef9ca86a2647fb6cd89c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c3e99fd4a66a5ac9c7dd32db07359666efe0002"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3b73c72c42348bf1555fd2b00f32f941324b242"
        },
        {
          "url": "https://git.kernel.org/stable/c/9530d666f4376c294cdf4348c29fe3542fec980a"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c0884fcd2ddde0544d2e77f297ae461e1f53f58"
        }
      ],
      "title": "wifi: ath12k: Decrement TID on RX peer frag setup error handling",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39761",
    "datePublished": "2025-09-11T16:52:29.788Z",
    "dateReserved": "2025-04-16T07:20:57.126Z",
    "dateUpdated": "2026-08-05T12:05:01.054Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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