Vulnerability-Lookup

FKIE_CVE-2026-31427

Vulnerability from fkie_nvd - Published: 2026-04-13 14:16 - Updated: 2026-05-20 19:27

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/01f34a80ac23ae90b1909b94b4ed05343a62f646	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/52fdda318ef2362fc5936385bcb8b3d0328ee629	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6a2b724460cb67caed500c508c2ae5cf012e4db4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6e5e3c87b7e6212f1d8414fc2e4d158b01e12025	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7edca70751b9bdb5b83eed53cde21eccf3c86147	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/82baeb871e8f04906bc886273fdf0209e1754eb3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/faa6ea32797a1847790514ff0da1be1d09771580	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fe463e76c9b4b0b43b5ee8961b4c500231f1a3f6	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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    }
  ],
  "id": "CVE-2026-31427",
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          "confidentialityImpact": "NONE",
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}

CVE-2026-31427 (GCVE-0-2026-31427)

Vulnerability from cvelistv5 – Published: 2026-04-13 13:40 – Updated: 2026-05-11 22:08

Title

netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp

Summary

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/faa6ea32797a18477…
https://git.kernel.org/stable/c/82baeb871e8f04906…
https://git.kernel.org/stable/c/6e5e3c87b7e6212f1…
https://git.kernel.org/stable/c/fe463e76c9b4b0b43…
https://git.kernel.org/stable/c/7edca70751b9bdb5b…
https://git.kernel.org/stable/c/01f34a80ac23ae90b…
https://git.kernel.org/stable/c/52fdda318ef2362fc…
https://git.kernel.org/stable/c/6a2b724460cb67cae…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4ab9e64e5e3c0516577818804aaf13a630d67bc9 , < faa6ea32797a1847790514ff0da1be1d09771580 (git) Affected: 4ab9e64e5e3c0516577818804aaf13a630d67bc9 , < 82baeb871e8f04906bc886273fdf0209e1754eb3 (git) Affected: 4ab9e64e5e3c0516577818804aaf13a630d67bc9 , < 6e5e3c87b7e6212f1d8414fc2e4d158b01e12025 (git) Affected: 4ab9e64e5e3c0516577818804aaf13a630d67bc9 , < fe463e76c9b4b0b43b5ee8961b4c500231f1a3f6 (git) Affected: 4ab9e64e5e3c0516577818804aaf13a630d67bc9 , < 7edca70751b9bdb5b83eed53cde21eccf3c86147 (git) Affected: 4ab9e64e5e3c0516577818804aaf13a630d67bc9 , < 01f34a80ac23ae90b1909b94b4ed05343a62f646 (git) Affected: 4ab9e64e5e3c0516577818804aaf13a630d67bc9 , < 52fdda318ef2362fc5936385bcb8b3d0328ee629 (git) Affected: 4ab9e64e5e3c0516577818804aaf13a630d67bc9 , < 6a2b724460cb67caed500c508c2ae5cf012e4db4 (git)
Linux	Linux	Affected: 2.6.26 Unaffected: 0 , < 2.6.26 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.131 , ≤ 6.6.* (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_sip.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp\n\nprocess_sdp() declares union nf_inet_addr rtp_addr on the stack and\npasses it to the nf_nat_sip sdp_session hook after walking the SDP\nmedia descriptions. However rtp_addr is only initialized inside the\nmedia loop when a recognized media type with a non-zero port is found.\n\nIf the SDP body contains no m= lines, only inactive media sections\n(m=audio 0 ...) or only unrecognized media types, rtp_addr is never\nassigned. Despite that, the function still calls hooks-\u003esdp_session()\nwith \u0026rtp_addr, causing nf_nat_sdp_session() to format the stale stack\nvalue as an IP address and rewrite the SDP session owner and connection\nlines with it.\n\nWith CONFIG_INIT_STACK_ALL_ZERO (default on most distributions) this\nresults in the session-level o= and c= addresses being rewritten to\n0.0.0.0 for inactive SDP sessions. Without stack auto-init the\nrewritten address is whatever happened to be on the stack.\n\nFix this by pre-initializing rtp_addr from the session-level connection\naddress (caddr) when available, and tracking via a have_rtp_addr flag\nwhether any valid address was established. Skip the sdp_session hook\nentirely when no valid address exists."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:08:29.865Z",
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          "url": "https://git.kernel.org/stable/c/01f34a80ac23ae90b1909b94b4ed05343a62f646"
        },
        {
          "url": "https://git.kernel.org/stable/c/52fdda318ef2362fc5936385bcb8b3d0328ee629"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a2b724460cb67caed500c508c2ae5cf012e4db4"
        }
      ],
      "title": "netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31427",
    "datePublished": "2026-04-13T13:40:30.280Z",
    "dateReserved": "2026-03-09T15:48:24.088Z",
    "dateUpdated": "2026-05-11T22:08:29.865Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-31427

CVE-2026-31427 (GCVE-0-2026-31427)

Tags

Sightings

Nomenclature