CVE-2026-98853

net: gso: limit recursive IP-in-IP segmentation

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 30 Oct 2026 13:45:33 UTC. Read the latest advisory.

cve-program · CVE-2026-98853

Published

In the Linux kernel, the following vulnerability has been resolved: net: gso: limit recursive IP-in-IP segmentation IP-in-IP GSO can re-enter inet_gso_segment() or ipv6_gso_segment() for each nested IP header. encap_level tracks header bytes, not callback depth, so a deep chain can exhaust the kernel stack. Making inet_gso_segment() stackable introduced unbounded IPv4 nesting; IPIP GSO/TSO later made the path reachable. The IPv6 stackable path was introduced separately and uses the same guard. Count IPv4 and IPv6 GSO handler entries in skb_gso_cb, initialized once per top-level GSO operation and preserved across GRE/UDP context changes. Use the existing IP_TUNNEL_RECURSION_LIMIT for both handlers. The first five entries pass, and the sixth returns -EINVAL before dispatching another GSO callback.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-98853

Published

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/net/gso.h",
                        "net/core/gso.c",
                        "net/ipv4/af_inet.c",
                        "net/ipv6/ip6_offload.c"
                    ],
                    "versions": [
                        {
                            "version": "3347c960295583eee3fd58e5c539fb1972fbc005",
                            "lessThan": "388604279da3d0698a151efa4fb6d852efa0de4a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3347c960295583eee3fd58e5c539fb1972fbc005",
                            "lessThan": "c949646c900e879afce47df1b607fa320eb63bf2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3347c960295583eee3fd58e5c539fb1972fbc005",
                            "lessThan": "006c8b834aed8b02bd8fb9fb05e9e7ead37d1763",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/net/gso.h",
                        "net/core/gso.c",
                        "net/ipv4/af_inet.c",
                        "net/ipv6/ip6_offload.c"
                    ],
                    "versions": [
                        {
                            "version": "3.13",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.13",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.60",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.10",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON