In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp
process_sdp() declares union nf_inet_addr rtp_addr on the stack and
passes it to the nf_nat_sip sdp_session hook after walking the SDP
media descriptions. However rtp_addr is only initialized inside the
media loop when a recognized media type with a non-zero port is found.
If the SDP body contains no m= lines, only inactive media sections
(m=audio 0 ...) or only unrecognized media types, rtp_addr is never
assigned. Despite that, the function still calls hooks->sdp_session()
with &rtp_addr, causing nf_nat_sdp_session() to format the stale stack
value as an IP address and rewrite the SDP session owner and connection
lines with it.
With CONFIG_INIT_STACK_ALL_ZERO (default on most distributions) this
results in the session-level o= and c= addresses being rewritten to
0.0.0.0 for inactive SDP sessions. Without stack auto-init the
rewritten address is whatever happened to be on the stack.
Fix this by pre-initializing rtp_addr from the session-level connection
address (caddr) when available, and tracking via a have_rtp_addr flag
whether any valid address was established. Skip the sdp_session hook
entirely when no valid address exists.
References
Configurations
Configuration 1 (hide)
|
History
20 May 2026, 19:27
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux linux Kernel
Linux |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | CWE-908 | |
| CPE | cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/01f34a80ac23ae90b1909b94b4ed05343a62f646 - Patch | |
| References | () https://git.kernel.org/stable/c/52fdda318ef2362fc5936385bcb8b3d0328ee629 - Patch | |
| References | () https://git.kernel.org/stable/c/6a2b724460cb67caed500c508c2ae5cf012e4db4 - Patch | |
| References | () https://git.kernel.org/stable/c/6e5e3c87b7e6212f1d8414fc2e4d158b01e12025 - Patch | |
| References | () https://git.kernel.org/stable/c/7edca70751b9bdb5b83eed53cde21eccf3c86147 - Patch | |
| References | () https://git.kernel.org/stable/c/82baeb871e8f04906bc886273fdf0209e1754eb3 - Patch | |
| References | () https://git.kernel.org/stable/c/faa6ea32797a1847790514ff0da1be1d09771580 - Patch | |
| References | () https://git.kernel.org/stable/c/fe463e76c9b4b0b43b5ee8961b4c500231f1a3f6 - Patch |
18 Apr 2026, 09:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
13 Apr 2026, 14:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-13 14:16
Updated : 2026-05-20 19:27
NVD link : CVE-2026-31427
Mitre link : CVE-2026-31427
CVE.ORG link : CVE-2026-31427
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-908
Use of Uninitialized Resource