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.
References
Configurations
Configuration 1 (hide)
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History
26 May 2026, 14:40
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/528b4509c9dfc272e2e92d811915e5211650d383 - Patch | |
| References | () https://git.kernel.org/stable/c/75fcaee5170e7dbbee778927134ef2e9568b4659 - Patch | |
| References | () https://git.kernel.org/stable/c/865dba58958c3a86786f89a501971ab0e3ec6ba9 - Patch | |
| References | () https://git.kernel.org/stable/c/b75209debb9adab287b3caa982f77788c1e15027 - Patch | |
| References | () https://git.kernel.org/stable/c/cd1b7403ec835f8a0b3f1f7e68ac26af2cb1e42f - Patch | |
| References | () https://git.kernel.org/stable/c/d4f17256544cc37f6534a14a27a9dec3540c2015 - Patch | |
| References | () https://git.kernel.org/stable/c/ed81b6a7012485acdb9c6c80735a0b7d8e5e1873 - Patch | |
| References | () https://git.kernel.org/stable/c/fbce58e719a17aa215c724473fd5baaa4a8dc57c - Patch | |
| First Time |
Linux
Linux linux Kernel |
|
| CPE | cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* |
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| CWE | NVD-CWE-noinfo |
27 Apr 2026, 14:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 8.6 |
18 Apr 2026, 09:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
03 Apr 2026, 16:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-03 16:16
Updated : 2026-05-26 14:40
NVD link : CVE-2026-23457
Mitre link : CVE-2026-23457
CVE.ORG link : CVE-2026-23457
JSON object : View
Products Affected
linux
- linux_kernel
CWE