Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2025-21744

wifi: brcmfmac: fix NULL pointer dereference in brcmf_txfinalize()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.8, 4.9, 5.4.291, 5.10.235, 5.15.179, and 4 more
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 7f00ee2bbc630900ba16fc2690473f3e2db0e264 · fixed in 2326e19190e176fd72bb542b837a9d2b7fcb8693; From 7f00ee2bbc630900ba16fc2690473f3e2db0e264 · fixed in 59ff4fa653ff6db07c61152516ffba79c2a74bda; From 7f00ee2bbc630900ba16fc2690473f3e2db0e264 · fixed in 61541d9b5a23df33934fcc620a3a81f246b1b240; From 7f00ee2bbc630900ba16fc2690473f3e2db0e264 · fixed in 4e51d6d093e763348916e69d06d87e0a5593661b; From 7f00ee2bbc630900ba16fc2690473f3e2db0e264 · fixed in 3877fc67bd3d5566cc12763bce39710ceb74a97d; From 7f00ee2bbc630900ba16fc2690473f3e2db0e264 · fixed in fbbfef2a5b858eab55741a58b2ac9a0cc8d53c58; From 7f00ee2bbc630900ba16fc2690473f3e2db0e264 · fixed in a2beefc4fa49ebc22e664dc6b39dbd054f8488f9; From 7f00ee2bbc630900ba16fc2690473f3e2db0e264 · fixed in 68abd0c4ebf24cd499841a488b97a6873d5efabb; From 4.7.10 · fixed in 4.8; From 4.8.4 · fixed in 4.9

  • Linux Linux

    4.9

  • KernelLinux

    From 4.9.0 · fixed in 5.4.291; From 5.5.0 · fixed in 5.10.235; From 5.11.0 · fixed in 5.15.179; From 5.16.0 · fixed in 6.1.129; From 6.2.0 · fixed in 6.6.78; From 6.7.0 · fixed in 6.12.14; From 6.13.0 · fixed in 6.13.3

References 8

git.kernel.org