netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp()
Summary
| CVE | CVE-2026-23457 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-03 16:16:32 UTC |
| Updated | 2026-04-18 09:16:28 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.000320000 probability, percentile 0.090980000 (date 2026-04-18)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da ed81b6a7012485acdb9c6c80735a0b7d8e5e1873 git | Not specified |
| CNA | Linux | Linux | affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da cd1b7403ec835f8a0b3f1f7e68ac26af2cb1e42f git | Not specified |
| CNA | Linux | Linux | affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da b75209debb9adab287b3caa982f77788c1e15027 git | Not specified |
| CNA | Linux | Linux | affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da 528b4509c9dfc272e2e92d811915e5211650d383 git | Not specified |
| CNA | Linux | Linux | affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da 75fcaee5170e7dbbee778927134ef2e9568b4659 git | Not specified |
| CNA | Linux | Linux | affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da 865dba58958c3a86786f89a501971ab0e3ec6ba9 git | Not specified |
| CNA | Linux | Linux | affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da d4f17256544cc37f6534a14a27a9dec3540c2015 git | Not specified |
| CNA | Linux | Linux | affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da fbce58e719a17aa215c724473fd5baaa4a8dc57c git | Not specified |
| CNA | Linux | Linux | affected 2.6.34 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.34 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.253 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.203 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.167 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.130 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.78 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.20 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.10 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/d4f17256544cc37f6534a14a27a9dec3540c2015 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ed81b6a7012485acdb9c6c80735a0b7d8e5e1873 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b75209debb9adab287b3caa982f77788c1e15027 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/75fcaee5170e7dbbee778927134ef2e9568b4659 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/528b4509c9dfc272e2e92d811915e5211650d383 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/fbce58e719a17aa215c724473fd5baaa4a8dc57c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cd1b7403ec835f8a0b3f1f7e68ac26af2cb1e42f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/865dba58958c3a86786f89a501971ab0e3ec6ba9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.