netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp()
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp() sip_help_tcp() parses the SIP Content-Length header with simple_strtoul(), which returns unsigned long, but stores the result in unsigned int clen. On 64-bit systems, values exceeding UINT_MAX are silently truncated before computing the SIP message boundary. For example, Content-Length 4294967328 (2^32 + 32) is truncated to 32, causing the parser to miscalculate where the current message ends. The loop then treats trailing data in the TCP segment as a second SIP message and processes it through the SDP parser. Fix this by changing clen to unsigned long to match the return type of simple_strtoul(), and reject Content-Length values that exceed the remaining TCP payload length.
CVE-2026-23457
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-2026-23457
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": [
{
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"version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da",
"lessThan": "ed81b6a7012485acdb9c6c80735a0b7d8e5e1873",
"versionType": "git"
},
{
"status": "affected",
"version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da",
"lessThan": "cd1b7403ec835f8a0b3f1f7e68ac26af2cb1e42f",
"versionType": "git"
},
{
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"lessThan": "b75209debb9adab287b3caa982f77788c1e15027",
"versionType": "git"
},
{
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"lessThan": "528b4509c9dfc272e2e92d811915e5211650d383",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "75fcaee5170e7dbbee778927134ef2e9568b4659",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "865dba58958c3a86786f89a501971ab0e3ec6ba9",
"versionType": "git"
},
{
"status": "affected",
"version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da",
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"versionType": "git"
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{
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"lessThan": "fbce58e719a17aa215c724473fd5baaa4a8dc57c",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nf_conntrack_sip.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.34"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.34",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.20",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.10",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_conntrack_sip.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23457
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39857 · Revision 1
- Added to Heist Feed
- Publisher date