CVE-2025-21744 (GCVE-0-2025-21744)
Vulnerability from cvelistv5
Published
2025-02-27 02:12
Modified
2026-01-02 15:28
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: fix NULL pointer dereference in brcmf_txfinalize() On removal of the device or unloading of the kernel module a potential NULL pointer dereference occurs. The following sequence deletes the interface: brcmf_detach() brcmf_remove_interface() brcmf_del_if() Inside the brcmf_del_if() function the drvr->if2bss[ifidx] is updated to BRCMF_BSSIDX_INVALID (-1) if the bsscfgidx matches. After brcmf_remove_interface() call the brcmf_proto_detach() function is called providing the following sequence: brcmf_detach() brcmf_proto_detach() brcmf_proto_msgbuf_detach() brcmf_flowring_detach() brcmf_msgbuf_delete_flowring() brcmf_msgbuf_remove_flowring() brcmf_flowring_delete() brcmf_get_ifp() brcmf_txfinalize() Since brcmf_get_ip() can and actually will return NULL in this case the call to brcmf_txfinalize() will result in a NULL pointer dereference inside brcmf_txfinalize() when trying to update ifp->ndev->stats.tx_errors. This will only happen if a flowring still has an skb. Although the NULL pointer dereference has only been seen when trying to update the tx statistic, all other uses of the ifp pointer have been guarded as well with an early return if ifp is NULL.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7f00ee2bbc630900ba16fc2690473f3e2db0e264
Version: 7f00ee2bbc630900ba16fc2690473f3e2db0e264
Version: 7f00ee2bbc630900ba16fc2690473f3e2db0e264
Version: 7f00ee2bbc630900ba16fc2690473f3e2db0e264
Version: 7f00ee2bbc630900ba16fc2690473f3e2db0e264
Version: 7f00ee2bbc630900ba16fc2690473f3e2db0e264
Version: 7f00ee2bbc630900ba16fc2690473f3e2db0e264
Version: 7f00ee2bbc630900ba16fc2690473f3e2db0e264
Version: 6faa698c35a43b9e74ea24e90fe37471d08d00d0
Version: 9119232cc92a269d7860b4aa51f07d3923a3cc10
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: fix NULL pointer dereference in brcmf_txfinalize()\n\nOn removal of the device or unloading of the kernel module a potential NULL\npointer dereference occurs.\n\nThe following sequence deletes the interface:\n\n  brcmf_detach()\n    brcmf_remove_interface()\n      brcmf_del_if()\n\nInside the brcmf_del_if() function the drvr-\u003eif2bss[ifidx] is updated to\nBRCMF_BSSIDX_INVALID (-1) if the bsscfgidx matches.\n\nAfter brcmf_remove_interface() call the brcmf_proto_detach() function is\ncalled providing the following sequence:\n\n  brcmf_detach()\n    brcmf_proto_detach()\n      brcmf_proto_msgbuf_detach()\n        brcmf_flowring_detach()\n          brcmf_msgbuf_delete_flowring()\n            brcmf_msgbuf_remove_flowring()\n              brcmf_flowring_delete()\n                brcmf_get_ifp()\n                brcmf_txfinalize()\n\nSince brcmf_get_ip() can and actually will return NULL in this case the\ncall to brcmf_txfinalize() will result in a NULL pointer dereference inside\nbrcmf_txfinalize() when trying to update ifp-\u003endev-\u003estats.tx_errors.\n\nThis will only happen if a flowring still has an skb.\n\nAlthough the NULL pointer dereference has only been seen when trying to\nupdate the tx statistic, all other uses of the ifp pointer have been\nguarded as well with an early return if ifp is NULL."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/59ff4fa653ff6db07c61152516ffba79c2a74bda"
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          "url": "https://git.kernel.org/stable/c/61541d9b5a23df33934fcc620a3a81f246b1b240"
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          "url": "https://git.kernel.org/stable/c/4e51d6d093e763348916e69d06d87e0a5593661b"
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          "url": "https://git.kernel.org/stable/c/3877fc67bd3d5566cc12763bce39710ceb74a97d"
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          "url": "https://git.kernel.org/stable/c/68abd0c4ebf24cd499841a488b97a6873d5efabb"
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      ],
      "title": "wifi: brcmfmac: fix NULL pointer dereference in brcmf_txfinalize()",
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    "cveId": "CVE-2025-21744",
    "datePublished": "2025-02-27T02:12:17.259Z",
    "dateReserved": "2024-12-29T08:45:45.757Z",
    "dateUpdated": "2026-01-02T15:28:30.829Z",
    "state": "PUBLISHED"
  },
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}


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