CVE-2026-97589 (GCVE-0-2026-97589)
Vulnerability from cvelistv5
Published
2026-09-25 10:22
Modified
2026-10-19 09:09
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/crypto: Fix wrong return code to engine in asynch callbacks When crypto_finalize_hash_request() or crypto_finalize_skcipher_request() explicitly completes a request, the do_one_request callback must return 0 to indicate successful handling. Returning a negative error code causes the crypto engine to assume the driver failed to take ownership and triggers a second completion via crypto_request_complete(), resulting in a double completion. This pattern occurs in paes_s390.c 4 times and once in phmac_s390.c. Fixed in phmac_do_one_request() and all four paes do_one_request callbacks (ecb, cbc, ctr, xts) by returning 0 after explicit finalization instead of propagating the error code.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6cd87cb5ef6ca50ae17c371482ceaab1d635e232
Version: 6cd87cb5ef6ca50ae17c371482ceaab1d635e232
Version: 6cd87cb5ef6ca50ae17c371482ceaab1d635e232
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/crypto/paes_s390.c",
            "arch/s390/crypto/phmac_s390.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "972e0d9b7d1d112240ccde1f1be85bf9ffaa1720",
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              "versionType": "git"
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              "versionType": "git"
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              "versionType": "git"
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/crypto/paes_s390.c",
            "arch/s390/crypto/phmac_s390.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.2.7",
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                  "vulnerable": true
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                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/crypto: Fix wrong return code to engine in asynch callbacks\n\nWhen crypto_finalize_hash_request() or\ncrypto_finalize_skcipher_request() explicitly completes a request, the\ndo_one_request callback must return 0 to indicate successful\nhandling. Returning a negative error code causes the crypto engine to\nassume the driver failed to take ownership and triggers a second\ncompletion via crypto_request_complete(), resulting in a double\ncompletion. This pattern occurs in paes_s390.c 4 times and once in\nphmac_s390.c.\n\nFixed in phmac_do_one_request() and all four paes do_one_request\ncallbacks (ecb, cbc, ctr, xts) by returning 0 after explicit\nfinalization instead of propagating the error code."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The faulty return is in ecb/cbc/ctr/xts_paes_do_one_request() and phmac_do_one_request(), which run in the crypto engine worker. They are reached through local crypto API users: AF_ALG sockets binding \"ecb(paes)\" etc. (algif_skcipher recvmsg -\u003e ecb_paes_crypt -\u003e engine) or dm-crypt. No remote peer supplies the data that causes the failure.\nAC:H - The double completion fires only when the engine path returns an error. That needs the protected key to be invalidated (-EKEYEXPIRED, e.g. the wrapping key changed) and then re-conversion to fail in paes_convert_key() because the card is busy or offline. AF_ALG blocks setkey while op sockets exist, so the attacker cannot force this state.\nPR:L - AF_ALG socket creation and binding the paes/phmac algorithms need no capability, so a local unprivileged user holding usable key material can push requests through the paes engine path.\nUI:N - No victim action is needed. Once the engine-side failure condition exists, the attacker\u0027s own AF_ALG requests (or ordinary dm-crypt I/O) hit the double completion.\nS:U - The corruption stays within the kernel\u0027s own security authority. There is no guest-to-host or other boundary crossing.\nC:H - crypto_pump_requests() calls crypto_request_complete() a second time after crypto_finalize_skcipher_request(). In AF_ALG the extra complete of ctx-\u003ewait lets a later request\u0027s areq be freed while the engine still processes it, so the engine keeps reading freed memory (use-after-free).\nI:H - The engine\u0027s skcipher walk and cpacf output keep writing into the freed request and scatterlist memory. For dm-crypt, the same bio completes twice. Both are use-after-free writes that can be used for heap corruption.\nA:H - The double completion corrupts request/bio lifetime (double bio end or a use-after-free on the areq), which can crash the kernel or corrupt dm-crypt I/O."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:09:53.140Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/972e0d9b7d1d112240ccde1f1be85bf9ffaa1720"
        },
        {
          "url": "https://git.kernel.org/stable/c/5480291aa848e19e61175abfd457933516db70c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/ac1481320110b803ab9b79ab4d2ca11a74fc05f2"
        }
      ],
      "title": "s390/crypto: Fix wrong return code to engine in asynch callbacks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97589",
    "datePublished": "2026-09-25T10:22:07.441Z",
    "dateReserved": "2026-09-24T16:01:01.157Z",
    "dateUpdated": "2026-10-19T09:09:53.140Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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