wifi: brcmfmac: fix NULL pointer dereference in brcmf_txfinalize()
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.
CVE-2025-21744
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-21744
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7f00ee2bbc630900ba16fc2690473f3e2db0e264",
"lessThan": "2326e19190e176fd72bb542b837a9d2b7fcb8693",
"versionType": "git"
},
{
"status": "affected",
"version": "7f00ee2bbc630900ba16fc2690473f3e2db0e264",
"lessThan": "59ff4fa653ff6db07c61152516ffba79c2a74bda",
"versionType": "git"
},
{
"status": "affected",
"version": "7f00ee2bbc630900ba16fc2690473f3e2db0e264",
"lessThan": "61541d9b5a23df33934fcc620a3a81f246b1b240",
"versionType": "git"
},
{
"status": "affected",
"version": "7f00ee2bbc630900ba16fc2690473f3e2db0e264",
"lessThan": "4e51d6d093e763348916e69d06d87e0a5593661b",
"versionType": "git"
},
{
"status": "affected",
"version": "7f00ee2bbc630900ba16fc2690473f3e2db0e264",
"lessThan": "3877fc67bd3d5566cc12763bce39710ceb74a97d",
"versionType": "git"
},
{
"status": "affected",
"version": "7f00ee2bbc630900ba16fc2690473f3e2db0e264",
"lessThan": "fbbfef2a5b858eab55741a58b2ac9a0cc8d53c58",
"versionType": "git"
},
{
"status": "affected",
"version": "7f00ee2bbc630900ba16fc2690473f3e2db0e264",
"lessThan": "a2beefc4fa49ebc22e664dc6b39dbd054f8488f9",
"versionType": "git"
},
{
"status": "affected",
"version": "7f00ee2bbc630900ba16fc2690473f3e2db0e264",
"lessThan": "68abd0c4ebf24cd499841a488b97a6873d5efabb",
"versionType": "git"
},
{
"status": "affected",
"version": "6faa698c35a43b9e74ea24e90fe37471d08d00d0",
"versionType": "git"
},
{
"status": "affected",
"version": "9119232cc92a269d7860b4aa51f07d3923a3cc10",
"versionType": "git"
},
{
"status": "affected",
"version": "4.7.10",
"lessThan": "4.8",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.8.4",
"lessThan": "4.9",
"versionType": "semver"
}
],
"programFiles": [
"drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.291",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.235",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.179",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.129",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.78",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.14",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.3",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21744
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26929 · Revision 1
- Added to Heist Feed
- Publisher date