tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR
In the Linux kernel, the following vulnerability has been resolved: tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR In the SIOCGIFHWADDR path, tap_ioctl() copies 16 bytes of an uninitialised on-stack struct sockaddr_storage to userspace via ifr_hwaddr, but netif_get_mac_address() only writes sa_family and dev->addr_len (6 for Ethernet) bytes, leaving sa_data[6..13] uninitialised. Those 8 trailing bytes leak kernel stack contents; SIOCGIFHWADDR on a macvtap chardev returns kernel .text and direct-map pointers, defeating KASLR. Initialise ss at declaration.
CVE-2026-52937
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-2026-52937
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": "3b23a32a63219f51a5298bc55a65ecee866e79d0",
"lessThan": "37d028a473b0826ad5970b52b791db4a29a23627",
"versionType": "git"
},
{
"status": "affected",
"version": "3b23a32a63219f51a5298bc55a65ecee866e79d0",
"lessThan": "8197905d97099d8b1e3883112bbb497abd20f9f0",
"versionType": "git"
},
{
"status": "affected",
"version": "3b23a32a63219f51a5298bc55a65ecee866e79d0",
"lessThan": "719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb",
"versionType": "git"
},
{
"status": "affected",
"version": "3b23a32a63219f51a5298bc55a65ecee866e79d0",
"lessThan": "05305e832be7b9d65b2b72caacf7d850b3942b2a",
"versionType": "git"
},
{
"status": "affected",
"version": "3b23a32a63219f51a5298bc55a65ecee866e79d0",
"lessThan": "bddc09212c24934643bd44fc794748d2bbb3b6cd",
"versionType": "git"
},
{
"status": "affected",
"version": "176188cff67ec1aa55103647b61d02315cc38e98",
"versionType": "git"
},
{
"status": "affected",
"version": "1fc205d9e400f069ebf30d3faa6ec2bab2cbd7b4",
"versionType": "git"
},
{
"status": "affected",
"version": "4d0ae760c02c98fc78b78d3a0509896bc648ad1c",
"versionType": "git"
},
{
"status": "affected",
"version": "5.4.103",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.21",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.11.4",
"lessThan": "5.12",
"versionType": "semver"
}
],
"programFiles": [
"drivers/net/tap.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/tap.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-52937
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46345 · Revision 1
- Added to Heist Feed
- Publisher date