{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-38612", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-38612" ], "published": "2024-06-19T13:56:33Z", "summary": "ipv6: sr: fix invalid unregister error path", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sr: fix invalid unregister error path\n\nThe error path of seg6_init() is wrong in case CONFIG_IPV6_SEG6_LWTUNNEL\nis not defined. In that case if seg6_hmac_init() fails, the\ngenl_unregister_family() isn't called.\n\nThis issue exist since commit 46738b1317e1 (\"ipv6: sr: add option to control\nlwtunnel support\"), and commit 5559cea2d5aa (\"ipv6: sr: fix possible\nuse-after-free and null-ptr-deref\") replaced unregister_pernet_subsys()\nwith genl_unregister_family() in this error path.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": 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ancestry (strak rule)", "upstream_fixed": "6.6.33" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-38612" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/10610575a3ac2a702bf5c57aa931beaf847949c7" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/646cd236c55e2cb5f146fc41bbe4034c4af5b2a4" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/00e6335329f23ac6cf3105931691674e28bc598c" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/1a63730fb315bb1bab97edd69ff58ad45e04bb01" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/e77a3ec7ada84543e75722a1283785a6544de925" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/3398a40dccb88d3a7eef378247a023a78472db66" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/85a70ff1e572160f1eeb096ed48d09a1c9d4d89a" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c04d6a914e890ccea4a9d11233009a2ee7978bf4" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/160e9d2752181fcf18c662e74022d77d3164cd45" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.0, "cvss_v3_severity": "High", "scenario": "AV:L - The leaked `seg6_genl_family` is reached through generic netlink sockets (`nlctrl` family enumeration or `SEG6_CMD_*` messages), which require local system access. No remote packet path reaches the stale registration.\nAC:H - The corrupt state only arises if `seg6_hmac_init()` fails during one-shot module/boot init (an ENOMEM or missing-crypto condition an attacker cannot reliably force), and only on the uncommon `CONFIG_IPV6_SEG6_HMAC=y` with `CONFIG_IPV6_SEG6_LWTUNNEL=n` configuration, since distros that enable HMAC normally also enable LWTUNNEL.\nPR:L - Once the family is leaked, any unprivileged local user can dereference the stale `struct genl_family` via `CTRL_CMD_GETFAMILY`/dump on `nlctrl`, which carries no capability check; in the module case even the `GENL_ADMIN_PERM` flag is read out of the freed memory, so the privilege gate itself is unreliable.\nUI:N - Exploitation needs only the attacker's own netlink socket operations after the failed init; no victim action is involved.\nS:U - The dangling family struct, freed pernet data, and any resulting code execution all remain within the kernel's own security authority \u2014 no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `CTRL_CMD_GETFAMILY` copies `name`, `version`, `maxattr`, and the op list out of the freed module region into a netlink reply, and `SEG6_CMD_GET_TUNSRC` returns data read through the freed `seg6_pernet_data`, disclosing reclaimed kernel memory to userspace.\nI:H - The use-after-free supplies write primitives \u2014 `SEG6_CMD_SET_TUNSRC` writes an attacker-supplied IPv6 address into freed memory and `SEG6_CMD_SETHMAC` mutates a freed rhashtable \u2014 while the stale `family->ops[].doit`/`pre_doit` pointers in freed module memory offer control-flow hijack.\nA:H - Dereferencing the freed family struct or the dangling `net->ipv6.seg6_data` produces a use-after-free oops, and netns created after the failure yield a NULL-pointer dereference, either of which panics the kernel." } } }