net: use skb_header_pointer() for TCPv4 GSO frag_off check
In the Linux kernel, the following vulnerability has been resolved: net: use skb_header_pointer() for TCPv4 GSO frag_off check Syzbot reported a KMSAN uninit-value warning in gso_features_check() called from netif_skb_features() [1]. gso_features_check() reads iph->frag_off to decide whether to clear mangleid_features. Accessing the IPv4 header via ip_hdr()/inner_ip_hdr() can rely on skb header offsets that are not always safe for direct dereference on packets injected from PF_PACKET paths. Use skb_header_pointer() for the TCPv4 frag_off check so the header read is robust whether data is already linear or needs copying. [1] https://syzkaller.appspot.com/bug?extid=1543a7d954d9c6d00407
CVE-2026-43036
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-2026-43036
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": "cbc53e08a793b073e79f42ca33f1f3568703540d",
"lessThan": "5057502630fbc8ce468ff617ff59af275960b537",
"versionType": "git"
},
{
"status": "affected",
"version": "cbc53e08a793b073e79f42ca33f1f3568703540d",
"lessThan": "f7a6cd508e9e825a2c69fa9e13d41ee156852f25",
"versionType": "git"
},
{
"status": "affected",
"version": "cbc53e08a793b073e79f42ca33f1f3568703540d",
"lessThan": "cc91202fc20a44aab4c206f12a2bfe05da936051",
"versionType": "git"
},
{
"status": "affected",
"version": "cbc53e08a793b073e79f42ca33f1f3568703540d",
"lessThan": "d970341cfa5594614c7a6634886c7688b4f5cafd",
"versionType": "git"
},
{
"status": "affected",
"version": "cbc53e08a793b073e79f42ca33f1f3568703540d",
"lessThan": "ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0",
"versionType": "git"
}
],
"programFiles": [
"net/core/dev.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.81",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/dev.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43036
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46249 · Revision 1
- Added to Heist Feed
- Publisher date