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CVE-2026-31427— netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于process_sdp函数使用未初始化的rtp_addr，可能导致SDP会话信息被错误重写。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.17% · P6

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4ab9e64e5e3c0516577818804aaf13a630d67bc9< faa6ea32797a1847790514ff0da1be1d09771580 affected
4ab9e64e5e3c0516577818804aaf13a630d67bc9< 82baeb871e8f04906bc886273fdf0209e1754eb3 affected
4ab9e64e5e3c0516577818804aaf13a630d67bc9< 6e5e3c87b7e6212f1d8414fc2e4d158b01e12025 affected
4ab9e64e5e3c0516577818804aaf13a630d67bc9< fe463e76c9b4b0b43b5ee8961b4c500231f1a3f6 affected
4ab9e64e5e3c0516577818804aaf13a630d67bc9< 7edca70751b9bdb5b83eed53cde21eccf3c86147 affected
4ab9e64e5e3c0516577818804aaf13a630d67bc9< 01f34a80ac23ae90b1909b94b4ed05343a62f646 affected
4ab9e64e5e3c0516577818804aaf13a630d67bc9< 52fdda318ef2362fc5936385bcb8b3d0328ee629 affected
4ab9e64e5e3c0516577818804aaf13a630d67bc9< 6a2b724460cb67caed500c508c2ae5cf012e4db4 affected
… +10 more rows
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I. Basic Information for CVE-2026-31427

Vulnerability Information
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Vulnerability Title
netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于process_sdp函数使用未初始化的rtp_addr，可能导致SDP会话信息被错误重写。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4ab9e64e5e3c0516577818804aaf13a630d67bc9 ~ faa6ea32797a1847790514ff0da1be1d09771580 -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2026-31427

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III. Intelligence Information for CVE-2026-31427

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Same Patch Batch · Linux · 2026-04-13 · 15 CVEs total

CVE-2026-31414 9.8 CRITICAL netfilter: nf_conntrack_expect: use expect->helper
CVE-2026-31419 7.8 HIGH net: bonding: fix use-after-free in bond_xmit_broadcast()
CVE-2026-31417 7.5 HIGH net/x25: Fix overflow when accumulating packets
CVE-2026-31426 7.0 HIGH ACPI: EC: clean up handlers on probe failure in acpi_ec_setup()
CVE-2026-31428 netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD
CVE-2026-31425 rds: ib: reject FRMR registration before IB connection is established
CVE-2026-31424 netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP
CVE-2026-31423 net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()
CVE-2026-31422 net/sched: cls_flow: fix NULL pointer dereference on shared blocks
CVE-2026-31420 bridge: mrp: reject zero test interval to avoid OOM panic
CVE-2026-31421 net/sched: cls_fw: fix NULL pointer dereference on shared blocks
CVE-2026-31418 netfilter: ipset: drop logically empty buckets in mtype_del
CVE-2026-31416 netfilter: nfnetlink_log: account for netlink header size
CVE-2026-31415 ipv6: avoid overflows in ip6_datagram_send_ctl()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31427

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