FatGid: FreeBSD 14.x kernel local privilege escalation
A local privilege escalation vulnerability has been identified in the FreeBSD 14.x kernel. The issue arises from a buffer overflow in the kern_setcred_copyin_supp_groups function, which can be exploited by local users. This vulnerability allows attackers to control execution flow and potentially execute arbitrary code in kernel space.
- ▪The vulnerability is located in the kern_setcred_copyin_supp_groups function within the FreeBSD 14.x kernel.
- ▪An attacker can exploit this vulnerability by triggering a buffer overflow through the setcred system call.
- ▪The overflow can corrupt critical registers, allowing attackers to control execution flow in the kernel.
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Record
| Original publisher | Fatgid |
| Canonical URL | https://fatgid.io/ |
| Publication time | Thu, 21 May 2026 12:15:02 +0000 |
| Retrieval time | 2026-05-21T12:21:11.069Z |
| Last seen | 2026-05-21T12:21:11.069Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | uOb0Cc8mTY2r |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Vulnerability details File: sys/kern/kern_prot.c Function: kern_setcred_copyin_supp_groups() Lines: 528-533 The function signature uses a double pointer for the groups argument: static int kern_setcred_copyin_supp_groups(struct setcred *const wcred, const u_int flags, gid_t *const smallgroups, gid_t **const groups) Because groups has type gid_t **, the expression sizeof(*groups) evaluates to sizeof(gid_t *) == 8 on LP64, rather than the intended sizeof(gid_t) == 4. This sizeof expression is used in two places: /* line 528-530: allocation */ *groups = wcred->sc_supp_groups_nb < CRED_SMALLGROUPS_NB ? smallgroups : malloc((wcred->sc_supp_groups_nb + 1) * sizeof(*groups), M_TEMP, M_WAITOK); /* sizeof(*groups) == 8 */ /* line 532-533: copyin */ error = copyin(wcred->sc_supp_groups, *groups +…
Excerpt limited to ~120 words for fair-use compliance. The full article is at Fatgid.
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