ipv4: validate checksum_start before completing checksum
In the Linux kernel, the following vulnerability has been resolved: ipv4: validate checksum_start before completing checksum If a packet with bad checksum metadata gets into the ipv4 stack, skb_checksum_help can corrupt the network header and cause a bunch of mischief. This was discovered and reported by Paulos, and has been reporoduced by others independently since. We really shouldn't allow such packets in, but as a defence in depth measure, let's also check before we complete the checksum. A more complete validation at input is forthcoming, but needs more work.
CVE-2026-99999
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-2026-99999
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": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "a464d950f31c89565cbaae038cc60db04fe01956",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "0fab003ef4698e0628060a45a48f14b43ba2a40a",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "94524b7b32691de2e2ce162c04d6cbc9106e5cbf",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "a65f69e0f38ffbed1b128029e09097436416dc8b",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "32a8b0adaa18e52aaa0b246b5ffe683075354dbb",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "f3e835af6226f1dd12160cbd696081e9b6155de0",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "c3e33464746166264334641dc850a36eef7e6326",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "6785011f8b16abf40b1e9d8b2e332232b3e68822",
"versionType": "git"
}
],
"programFiles": [
"include/net/ip.h",
"net/bridge/netfilter/nf_conntrack_bridge.c",
"net/ipv4/ip_output.c",
"net/netfilter/nfnetlink_queue.c",
"net/netfilter/xt_CHECKSUM.c",
"net/xfrm/xfrm_output.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.27"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.27",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.272",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.223",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.190",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.159",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.11",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/ip.h",
"net/bridge/netfilter/nf_conntrack_bridge.c",
"net/ipv4/ip_output.c",
"net/netfilter/nfnetlink_queue.c",
"net/netfilter/xt_CHECKSUM.c",
"net/xfrm/xfrm_output.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-99999
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #55619 · Revision 1
- Added to Heist Feed
- Publisher date