{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43292",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-43292"
  ],
  "published": "2026-05-08T13:13:56Z",
  "summary": "mm/vmalloc: prevent RCU stalls in kasan_release_vmalloc_node",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/vmalloc: prevent RCU stalls in kasan_release_vmalloc_node\n\nWhen CONFIG_PAGE_OWNER is enabled, freeing KASAN shadow pages during\nvmalloc cleanup triggers expensive stack unwinding that acquires RCU read\nlocks.  Processing a large purge_list without rescheduling can cause the\ntask to hold CPU for extended periods (10+ seconds), leading to RCU stalls\nand potential OOM conditions.\n\nThe issue manifests in purge_vmap_node() -> kasan_release_vmalloc_node()\nwhere iterating through hundreds or thousands of vmap_area entries and\nfreeing their associated shadow pages causes:\n\n  rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:\n  rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6229/1:b..l\n  ...\n  task:kworker/0:17 state:R running task stack:28840 pid:6229\n  ...\n  kasan_release_vmalloc_node+0x1ba/0xad0 mm/vmalloc.c:2299\n  purge_vmap_node+0x1ba/0xad0 mm/vmalloc.c:2299\n\nEach call to kasan_release_vmalloc() can free many pages, and with\npage_owner tracking, each free triggers save_stack() which performs stack\nunwinding under RCU read lock.  Without yielding, this creates an\nunbounded RCU critical section.\n\nAdd periodic cond_resched() calls within the loop to allow:\n- RCU grace periods to complete\n- Other tasks to run\n- Scheduler to preempt when needed\n\nThe fix uses need_resched() for immediate response under load, with a\nbatch count of 32 as a guaranteed upper bound to prevent worst-case stalls\neven under light load.",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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        "1:6.12.25-1+rpt1",
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        "1:6.12.47-1+rpt1~bookworm",
        "1:6.12.62-1+rpt1~bookworm"
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            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43292"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2efa9c02c9b4c0d6866aa445f11056809b25ca28"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1afe45f89d54b7183768ebbbbf14238ec187ab5c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b351fbe71091f7c8676c8ba597653d08b6719447"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5747435e0fd474c24530ef1a6822f47e7d264b27"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}