mm: zswap: fix crypto_free_acomp() deadlock in zswap_cpu_comp_dead()

{
  "id": "25d18d76a0624ae64a71802b59a4ee11908c81689c5404fbadec6d1f83415647",
  "url": "https://osv.dev/vulnerability/CVE-2025-22030",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm: zswap: fix crypto_free_acomp() deadlock in zswap_cpu_comp_dead()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm: zswap: fix crypto_free_acomp() deadlock in zswap_cpu_comp_dead() Currently, zswap_cpu_comp_dead() calls crypto_free_acomp() while holding the per-CPU acomp_ctx mutex. crypto_free_acomp() then holds scomp_lock (through crypto_exit_scomp_ops_async()). On the other hand, crypto_alloc_acomp_node() holds the scomp_lock (through crypto_scomp_init_tfm()), and then allocates memory. If the allocation results in reclaim, we may attempt to hold the per-CPU acomp_ctx mutex. The above dependencies can cause an ABBA deadlock. For example in the following scenario: (1) Task A running on CPU #1: crypto_alloc_acomp_node() Holds scomp_lock Enters reclaim Reads per_cpu_ptr(pool->acomp_ctx, 1) (2) Task A is descheduled (3) CPU #1 goes offline zswap_cpu_comp_dead(CPU #1) Holds per_cpu_ptr(pool->acomp_ctx, 1)) Calls crypto_free_acomp() Waits for scomp_lock (4) Task A running on CPU #2: Waits for per_cpu_ptr(pool->acomp_ctx, 1) // Read on CPU #1 DEADLOCK Since there is no requirement to call crypto_free_acomp() with the per-CPU acomp_ctx mutex held in zswap_cpu_comp_dead(), move it after the mutex is unlocked. Also move the acomp_request_free() and kfree() calls for consistency and to avoid any potential sublte locking dependencies in the future. With this, only setting acomp_ctx fields to NULL occurs with the mutex held. This is similar to how zswap_cpu_comp_prepare() only initializes acomp_ctx fields with the mutex held, aft",
    "evidence": "osv:CVE-2025-22030",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.23",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.13.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.14.2",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-22030",
      "aliases": [
        "CVE-2025-22030"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:33.210834845Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/717d9c35deff6c33235693171bacbb03e9643fa4",
        "https://git.kernel.org/stable/c/747e3eec1d7d124ea90ed3d7b85369df8b4e36d2",
        "https://git.kernel.org/stable/c/a8d18000e9d2d97aaf105f5f9b3b0e8a6fbf8b96",
        "https://git.kernel.org/stable/c/c11bcbc0a517acf69282c8225059b2a8ac5fe628",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22030.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-22030",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 500299,
  "published_at": "2025-04-16T14:11:50.625+00:00"
}