ghsa-jvhg-r77c-vccf
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix invalid prog->stats access when update_effective_progs fails
Syzkaller triggers an invalid memory access issue following fault injection in update_effective_progs. The issue can be described as follows:
__cgroup_bpf_detach update_effective_progs compute_effective_progs bpf_prog_array_alloc <-- fault inject purge_effective_progs / change to dummy_bpf_prog / array->items[index] = &dummy_bpf_prog.prog
---softirq start--- __do_softirq ... __cgroup_bpf_run_filter_skb __bpf_prog_run_save_cb bpf_prog_run stats = this_cpu_ptr(prog->stats) / invalid memory access / flags = u64_stats_update_begin_irqsave(&stats->syncp) ---softirq end---
static_branch_dec(&cgroup_bpf_enabled_key[atype])
The reason is that fault injection caused update_effective_progs to fail and then changed the original prog into dummy_bpf_prog.prog in purge_effective_progs. Then a softirq came, and accessing the members of dummy_bpf_prog.prog in the softirq triggers invalid mem access.
To fix it, skip updating stats when stats is NULL.
{
"affected": [],
"aliases": [
"CVE-2025-68742"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-24T13:16:29Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix invalid prog-\u003estats access when update_effective_progs fails\n\nSyzkaller triggers an invalid memory access issue following fault\ninjection in update_effective_progs. The issue can be described as\nfollows:\n\n__cgroup_bpf_detach\n update_effective_progs\n compute_effective_progs\n bpf_prog_array_alloc \u003c-- fault inject\n purge_effective_progs\n /* change to dummy_bpf_prog */\n array-\u003eitems[index] = \u0026dummy_bpf_prog.prog\n\n---softirq start---\n__do_softirq\n ...\n __cgroup_bpf_run_filter_skb\n __bpf_prog_run_save_cb\n bpf_prog_run\n stats = this_cpu_ptr(prog-\u003estats)\n /* invalid memory access */\n flags = u64_stats_update_begin_irqsave(\u0026stats-\u003esyncp)\n---softirq end---\n\n static_branch_dec(\u0026cgroup_bpf_enabled_key[atype])\n\nThe reason is that fault injection caused update_effective_progs to fail\nand then changed the original prog into dummy_bpf_prog.prog in\npurge_effective_progs. Then a softirq came, and accessing the members of\ndummy_bpf_prog.prog in the softirq triggers invalid mem access.\n\nTo fix it, skip updating stats when stats is NULL.",
"id": "GHSA-jvhg-r77c-vccf",
"modified": "2025-12-24T15:30:43Z",
"published": "2025-12-24T15:30:43Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68742"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2579c356ccd35d06238b176e4b460978186d804b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/539137e3038ce6f953efd72110110f03c14c7d97"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/56905bb70c8b88421709bb4e32fcba617aa37d41"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7dc211c1159d991db609bdf4b0fb9033c04adcbc"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
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