{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kernel/ptrace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4f39984176e7edcaba3432b6c649c6fe93bf2f80",
              "status": "affected",
              "version": "9f8bf718f29230e38a048d08fc3063e316cd60c1",
              "versionType": "git"
            },
            {
              "lessThan": "128a7494a9f15aad60cc6b7e3546bf481ac54a13",
              "status": "affected",
              "version": "9f8bf718f29230e38a048d08fc3063e316cd60c1",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kernel/ptrace.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": "6.18.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.8",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64/fpsimd: ptrace: Fix SVE writes on !SME systems\n\nWhen SVE is supported but SME is not supported, a ptrace write to the\nNT_ARM_SVE regset can place the tracee into an invalid state where\n(non-streaming) SVE register data is stored in FP_STATE_SVE format but\nTIF_SVE is clear. This can result in a later warning from\nfpsimd_restore_current_state(), e.g.\n\n  WARNING: CPU: 0 PID: 7214 at arch/arm64/kernel/fpsimd.c:383 fpsimd_restore_current_state+0x50c/0x748\n\nWhen this happens, fpsimd_restore_current_state() will set TIF_SVE,\nplacing the task into the correct state. This occurs before any other\ncheck of TIF_SVE can possibly occur, as other checks of TIF_SVE only\nhappen while the FPSIMD/SVE/SME state is live. Thus, aside from the\nwarning, there is no functional issue.\n\nThis bug was introduced during rework to error handling in commit:\n\n  9f8bf718f2923 (\"arm64/fpsimd: ptrace: Gracefully handle errors\")\n\n... where the setting of TIF_SVE was moved into a block which is only\nexecuted when system_supports_sme() is true.\n\nFix this by removing the system_supports_sme() check. This ensures that\nTIF_SVE is set for (SVE-formatted) writes to NT_ARM_SVE, at the cost of\nunconditionally manipulating the tracee\u0027s saved svcr value. The\nmanipulation of svcr is benign and inexpensive, and we already do\nsimilar elsewhere (e.g. during signal handling), so I don\u0027t think it\u0027s\nworth guarding this with system_supports_sme() checks.\n\nAside from the above, there is no functional change. The \u0027type\u0027 argument\nto sve_set_common() is only set to ARM64_VEC_SME (in ssve_set())) when\nsystem_supports_sme(), so the ARM64_VEC_SME case in the switch statement\nis still unreachable when !system_supports_sme(). When\nCONFIG_ARM64_SME=n, the only caller of sve_set_common() is sve_set(),\nand the compiler can constant-fold for the case where type is\nARM64_VEC_SVE, removing the logic for other cases."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-14T15:09:47.048Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4f39984176e7edcaba3432b6c649c6fe93bf2f80"
        },
        {
          "url": "https://git.kernel.org/stable/c/128a7494a9f15aad60cc6b7e3546bf481ac54a13"
        }
      ],
      "title": "arm64/fpsimd: ptrace: Fix SVE writes on !SME systems",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23114",
    "datePublished": "2026-02-14T15:09:47.048Z",
    "dateReserved": "2026-01-13T15:37:45.968Z",
    "dateUpdated": "2026-02-14T15:09:47.048Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23114\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-14T15:16:06.500\",\"lastModified\":\"2026-02-14T15:16:06.500\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\narm64/fpsimd: ptrace: Fix SVE writes on !SME systems\\n\\nWhen SVE is supported but SME is not supported, a ptrace write to the\\nNT_ARM_SVE regset can place the tracee into an invalid state where\\n(non-streaming) SVE register data is stored in FP_STATE_SVE format but\\nTIF_SVE is clear. This can result in a later warning from\\nfpsimd_restore_current_state(), e.g.\\n\\n  WARNING: CPU: 0 PID: 7214 at arch/arm64/kernel/fpsimd.c:383 fpsimd_restore_current_state+0x50c/0x748\\n\\nWhen this happens, fpsimd_restore_current_state() will set TIF_SVE,\\nplacing the task into the correct state. This occurs before any other\\ncheck of TIF_SVE can possibly occur, as other checks of TIF_SVE only\\nhappen while the FPSIMD/SVE/SME state is live. Thus, aside from the\\nwarning, there is no functional issue.\\n\\nThis bug was introduced during rework to error handling in commit:\\n\\n  9f8bf718f2923 (\\\"arm64/fpsimd: ptrace: Gracefully handle errors\\\")\\n\\n... where the setting of TIF_SVE was moved into a block which is only\\nexecuted when system_supports_sme() is true.\\n\\nFix this by removing the system_supports_sme() check. This ensures that\\nTIF_SVE is set for (SVE-formatted) writes to NT_ARM_SVE, at the cost of\\nunconditionally manipulating the tracee\u0027s saved svcr value. The\\nmanipulation of svcr is benign and inexpensive, and we already do\\nsimilar elsewhere (e.g. during signal handling), so I don\u0027t think it\u0027s\\nworth guarding this with system_supports_sme() checks.\\n\\nAside from the above, there is no functional change. The \u0027type\u0027 argument\\nto sve_set_common() is only set to ARM64_VEC_SME (in ssve_set())) when\\nsystem_supports_sme(), so the ARM64_VEC_SME case in the switch statement\\nis still unreachable when !system_supports_sme(). When\\nCONFIG_ARM64_SME=n, the only caller of sve_set_common() is sve_set(),\\nand the compiler can constant-fold for the case where type is\\nARM64_VEC_SVE, removing the logic for other cases.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/128a7494a9f15aad60cc6b7e3546bf481ac54a13\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4f39984176e7edcaba3432b6c649c6fe93bf2f80\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}