CVE-2025-68262 (GCVE-0-2025-68262)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:45 – Updated: 2026-05-11 21:49
VLAI
Title
crypto: zstd - fix double-free in per-CPU stream cleanup
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: zstd - fix double-free in per-CPU stream cleanup The crypto/zstd module has a double-free bug that occurs when multiple tfms are allocated and freed. The issue happens because zstd_streams (per-CPU contexts) are freed in zstd_exit() during every tfm destruction, rather than being managed at the module level. When multiple tfms exist, each tfm exit attempts to free the same shared per-CPU streams, resulting in a double-free. This leads to a stack trace similar to: BUG: Bad page state in process kworker/u16:1 pfn:106fd93 page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106fd93 flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff) page_type: 0xffffffff() raw: 0017ffffc0000000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: nonzero entire_mapcount Modules linked in: ... CPU: 3 UID: 0 PID: 2506 Comm: kworker/u16:1 Kdump: loaded Tainted: G B Hardware name: ... Workqueue: btrfs-delalloc btrfs_work_helper Call Trace: <TASK> dump_stack_lvl+0x5d/0x80 bad_page+0x71/0xd0 free_unref_page_prepare+0x24e/0x490 free_unref_page+0x60/0x170 crypto_acomp_free_streams+0x5d/0xc0 crypto_acomp_exit_tfm+0x23/0x50 crypto_destroy_tfm+0x60/0xc0 ... Change the lifecycle management of zstd_streams to free the streams only once during module cleanup.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f5ad93ffb54119a8dc5e18f070624d4ead586969 , < dc0f4509b0ed5d82bef78e058db0ac4df04d0695 (git)
Affected: f5ad93ffb54119a8dc5e18f070624d4ead586969 , < e983feaa79de1e46c9087fb9f02fedb0e5397ce6 (git)
Affected: f5ad93ffb54119a8dc5e18f070624d4ead586969 , < 48bc9da3c97c15f1ea24934bcb3b736acd30163d (git)
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Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.17.12 , ≤ 6.17.* (semver)
Unaffected: 6.18.1 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "crypto/zstd.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: zstd - fix double-free in per-CPU stream cleanup\n\nThe crypto/zstd module has a double-free bug that occurs when multiple\ntfms are allocated and freed.\n\nThe issue happens because zstd_streams (per-CPU contexts) are freed in\nzstd_exit() during every tfm destruction, rather than being managed at\nthe module level.  When multiple tfms exist, each tfm exit attempts to\nfree the same shared per-CPU streams, resulting in a double-free.\n\nThis leads to a stack trace similar to:\n\n  BUG: Bad page state in process kworker/u16:1  pfn:106fd93\n  page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106fd93\n  flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\n  page_type: 0xffffffff()\n  raw: 0017ffffc0000000 dead000000000100 dead000000000122 0000000000000000\n  raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n  page dumped because: nonzero entire_mapcount\n  Modules linked in: ...\n  CPU: 3 UID: 0 PID: 2506 Comm: kworker/u16:1 Kdump: loaded Tainted: G    B\n  Hardware name: ...\n  Workqueue: btrfs-delalloc btrfs_work_helper\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x5d/0x80\n   bad_page+0x71/0xd0\n   free_unref_page_prepare+0x24e/0x490\n   free_unref_page+0x60/0x170\n   crypto_acomp_free_streams+0x5d/0xc0\n   crypto_acomp_exit_tfm+0x23/0x50\n   crypto_destroy_tfm+0x60/0xc0\n   ...\n\nChange the lifecycle management of zstd_streams to free the streams only\nonce during module cleanup."
        }
      ],
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        "dateUpdated": "2026-05-11T21:49:58.343Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/48bc9da3c97c15f1ea24934bcb3b736acd30163d"
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      ],
      "title": "crypto: zstd - fix double-free in per-CPU stream cleanup",
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    "cveId": "CVE-2025-68262",
    "datePublished": "2025-12-16T14:45:04.198Z",
    "dateReserved": "2025-12-16T13:41:40.267Z",
    "dateUpdated": "2026-05-11T21:49:58.343Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-29",
      "epss": "0.00184",
      "percentile": "0.07116"
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    "nvd": {
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                ],
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        "descriptions": [
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: zstd - fix double-free in per-CPU stream cleanup\n\nThe crypto/zstd module has a double-free bug that occurs when multiple\ntfms are allocated and freed.\n\nThe issue happens because zstd_streams (per-CPU contexts) are freed in\nzstd_exit() during every tfm destruction, rather than being managed at\nthe module level.  When multiple tfms exist, each tfm exit attempts to\nfree the same shared per-CPU streams, resulting in a double-free.\n\nThis leads to a stack trace similar to:\n\n  BUG: Bad page state in process kworker/u16:1  pfn:106fd93\n  page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106fd93\n  flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\n  page_type: 0xffffffff()\n  raw: 0017ffffc0000000 dead000000000100 dead000000000122 0000000000000000\n  raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n  page dumped because: nonzero entire_mapcount\n  Modules linked in: ...\n  CPU: 3 UID: 0 PID: 2506 Comm: kworker/u16:1 Kdump: loaded Tainted: G    B\n  Hardware name: ...\n  Workqueue: btrfs-delalloc btrfs_work_helper\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x5d/0x80\n   bad_page+0x71/0xd0\n   free_unref_page_prepare+0x24e/0x490\n   free_unref_page+0x60/0x170\n   crypto_acomp_free_streams+0x5d/0xc0\n   crypto_acomp_exit_tfm+0x23/0x50\n   crypto_destroy_tfm+0x60/0xc0\n   ...\n\nChange the lifecycle management of zstd_streams to free the streams only\nonce during module cleanup."
          }
        ],
        "id": "CVE-2025-68262",
        "lastModified": "2026-06-17T09:58:49.730",
        "metrics": {},
        "published": "2025-12-16T15:15:55.697",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "cve": "CVE-2025-68262",
      "id": "CVE-2025-68262",
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      "product_status:known_affected": "277",
      "source": "Red Hat CSAF VEX",
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      "title": "kernel: crypto: zstd - fix double-free in per-CPU stream cleanup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68262.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:43:07Z",
      "cve": "CVE-2025-68262",
      "id": "CVE-2025-68262",
      "initial_release_date": "2025-12-17T00:24:06Z",
      "product_status:known_not_affected": "525",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68262",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68262.json",
      "version": "10"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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