Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
7f00ee2bbc630900ba16fc2690473f3e2db0e264 to < 2326e19190e176fd72bb542b837a9d2b7fcb8693affected7f00ee2bbc630900ba16fc2690473f3e2db0e264 to < 59ff4fa653ff6db07c61152516ffba79c2a74bdaaffected7f00ee2bbc630900ba16fc2690473f3e2db0e264 to < 61541d9b5a23df33934fcc620a3a81f246b1b240affected7f00ee2bbc630900ba16fc2690473f3e2db0e264 to < 4e51d6d093e763348916e69d06d87e0a5593661baffected7f00ee2bbc630900ba16fc2690473f3e2db0e264 to < 3877fc67bd3d5566cc12763bce39710ceb74a97daffected7f00ee2bbc630900ba16fc2690473f3e2db0e264 to < fbbfef2a5b858eab55741a58b2ac9a0cc8d53c58affected7f00ee2bbc630900ba16fc2690473f3e2db0e264 to < a2beefc4fa49ebc22e664dc6b39dbd054f8488f9affected7f00ee2bbc630900ba16fc2690473f3e2db0e264 to < 68abd0c4ebf24cd499841a488b97a6873d5efabbaffected6faa698c35a43b9e74ea24e90fe37471d08d00d0affected9119232cc92a269d7860b4aa51f07d3923a3cc10affected4.7.10 to < 4.8affected4.8.4 to < 4.9affected
Linux Linux
Default version status: affected
4.9affected0 to < 4.9unaffected5.4.291 to ≤ 5.4.*unaffected5.10.235 to ≤ 5.10.*unaffected5.15.179 to ≤ 5.15.*unaffected6.1.129 to ≤ 6.1.*unaffected6.6.78 to ≤ 6.6.*unaffected6.12.14 to ≤ 6.12.*unaffected6.13.3 to ≤ 6.13.*unaffected6.14 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/2326e19190e176fd72bb542b837a9d2b7fcb8693 ↗
- https://git.kernel.org/stable/c/59ff4fa653ff6db07c61152516ffba79c2a74bda ↗
- https://git.kernel.org/stable/c/61541d9b5a23df33934fcc620a3a81f246b1b240 ↗
- https://git.kernel.org/stable/c/4e51d6d093e763348916e69d06d87e0a5593661b ↗
- https://git.kernel.org/stable/c/3877fc67bd3d5566cc12763bce39710ceb74a97d ↗
- https://git.kernel.org/stable/c/fbbfef2a5b858eab55741a58b2ac9a0cc8d53c58 ↗
- https://git.kernel.org/stable/c/a2beefc4fa49ebc22e664dc6b39dbd054f8488f9 ↗
- https://git.kernel.org/stable/c/68abd0c4ebf24cd499841a488b97a6873d5efabb ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html ↗
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗