{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "64929fe8c0a43508eee952cf57903a61c52601e7"
            },
            {
              "fixed": "343a5bf68a8ff9affcf2b70677ea4cf40c195ee4"
            },
            {
              "fixed": "1a2785e5985627f2265ba7775949601a29ba0d1e"
            },
            {
              "fixed": "d7e20b9bd6c990773cf0c09e2642250b8a70263d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "6.18.27"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46081.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: acomp - fix wrong pointer stored by acomp_save_req()\n\nacomp_save_req() stores \u0026req-\u003echain in req-\u003ebase.data. When\nacomp_reqchain_done() is invoked on asynchronous completion, it receives\n\u0026req-\u003echain as the data argument but casts it directly to struct\nacomp_req. Since data points to the chain member, all subsequent field\naccesses are at a wrong offset, resulting in memory corruption.\n\nThe issue occurs when an asynchronous hardware implementation, such as\nthe QAT driver, completes a request that uses the DMA virtual address\ninterface (e.g. acomp_request_set_src_dma()). This combination causes\ncrypto_acomp_compress() to enter the acomp_do_req_chain() path, which\nsets acomp_reqchain_done() as the completion callback via\nacomp_save_req().\n\nWith KASAN enabled, this manifests as a general protection fault in\nacomp_reqchain_done():\n\n  general protection fault, probably for non-canonical address 0xe000040000000000\n  KASAN: probably user-memory-access in range [0x0000400000000000-0x0000400000000007]\n  RIP: 0010:acomp_reqchain_done+0x15b/0x4e0\n  Call Trace:\n   \u003cIRQ\u003e\n   qat_comp_alg_callback+0x5d/0xa0 [intel_qat]\n   adf_ring_response_handler+0x376/0x8b0 [intel_qat]\n   adf_response_handler+0x60/0x170 [intel_qat]\n   tasklet_action_common+0x223/0x820\n   handle_softirqs+0x1ab/0x640\n   \u003c/IRQ\u003e\n\nFix this by storing the request itself in req-\u003ebase.data instead of\n\u0026req-\u003echain, so that acomp_reqchain_done() receives the correct pointer.\nSimplify acomp_restore_req() accordingly to access req-\u003echain directly.",
  "id": "CVE-2026-46081",
  "modified": "2026-07-15T01:48:54.883523489Z",
  "published": "2026-05-27T12:58:19.498Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a2785e5985627f2265ba7775949601a29ba0d1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/343a5bf68a8ff9affcf2b70677ea4cf40c195ee4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d7e20b9bd6c990773cf0c09e2642250b8a70263d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46081.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46081"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "crypto: acomp - fix wrong pointer stored by acomp_save_req()"
}