{"api_version":"1","generated_at":"2026-07-24T20:12:10+00:00","cve":"CVE-2026-63837","urls":{"html":"https://cve.report/CVE-2026-63837","api":"https://cve.report/api/cve/CVE-2026-63837.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63837","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63837"},"summary":{"title":"net: ena: PHC: Check return code before setting timestamp output","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ena: PHC: Check return code before setting timestamp output\n\nena_phc_gettimex64() is setting the output parameter regardless\nof whether ena_com_phc_get_timestamp() succeeded or failed.\n\nWhen ena_com_phc_get_timestamp() returns an error, the timestamp\nparameter may contain uninitialized stack memory (e.g., when PHC is\ndisabled or in blocked state) or invalid hardware values. Passing\nthese to userspace via the PTP ioctl is both a security issue\n(information leak) and a correctness bug.\n\nFix by checking the return code after releasing the lock and only\nsetting the output timestamp on success.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 15:16:50","updated_at":"2026-07-19 15:16:50"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/bddf59818ae5102e6d82a4dae5add6df8da38fb0","name":"https://git.kernel.org/stable/c/bddf59818ae5102e6d82a4dae5add6df8da38fb0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/24a08d7d6218d60c033015cf4870b6096446e734","name":"https://git.kernel.org/stable/c/24a08d7d6218d60c033015cf4870b6096446e734","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/edcb049d836e175e7b3d5e0d05657104545b5e65","name":"https://git.kernel.org/stable/c/edcb049d836e175e7b3d5e0d05657104545b5e65","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63837","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63837","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e0ea34158ee8c4f7536cd781010339ff28c0d24c bddf59818ae5102e6d82a4dae5add6df8da38fb0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e0ea34158ee8c4f7536cd781010339ff28c0d24c edcb049d836e175e7b3d5e0d05657104545b5e65 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e0ea34158ee8c4f7536cd781010339ff28c0d24c 24a08d7d6218d60c033015cf4870b6096446e734 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.33 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.10 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63837","cve":"CVE-2026-63837","epss":"0.001660000","percentile":"0.062410000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/ethernet/amazon/ena/ena_phc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"bddf59818ae5102e6d82a4dae5add6df8da38fb0","status":"affected","version":"e0ea34158ee8c4f7536cd781010339ff28c0d24c","versionType":"git"},{"lessThan":"edcb049d836e175e7b3d5e0d05657104545b5e65","status":"affected","version":"e0ea34158ee8c4f7536cd781010339ff28c0d24c","versionType":"git"},{"lessThan":"24a08d7d6218d60c033015cf4870b6096446e734","status":"affected","version":"e0ea34158ee8c4f7536cd781010339ff28c0d24c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/ethernet/amazon/ena/ena_phc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.17"},{"lessThan":"6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.33","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"6.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ena: PHC: Check return code before setting timestamp output\n\nena_phc_gettimex64() is setting the output parameter regardless\nof whether ena_com_phc_get_timestamp() succeeded or failed.\n\nWhen ena_com_phc_get_timestamp() returns an error, the timestamp\nparameter may contain uninitialized stack memory (e.g., when PHC is\ndisabled or in blocked state) or invalid hardware values. Passing\nthese to userspace via the PTP ioctl is both a security issue\n(information leak) and a correctness bug.\n\nFix by checking the return code after releasing the lock and only\nsetting the output timestamp on success."}],"providerMetadata":{"dateUpdated":"2026-07-19T14:04:33.781Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/bddf59818ae5102e6d82a4dae5add6df8da38fb0"},{"url":"https://git.kernel.org/stable/c/edcb049d836e175e7b3d5e0d05657104545b5e65"},{"url":"https://git.kernel.org/stable/c/24a08d7d6218d60c033015cf4870b6096446e734"}],"title":"net: ena: PHC: Check return code before setting timestamp output","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63837","datePublished":"2026-07-19T14:04:33.781Z","dateReserved":"2026-07-19T07:54:57.015Z","dateUpdated":"2026-07-19T14:04:33.781Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 15:16:50","lastModifiedDate":"2026-07-19 15:16:50","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63837","Ordinal":"1","Title":"net: ena: PHC: Check return code before setting timestamp output","CVE":"CVE-2026-63837","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63837","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ena: PHC: Check return code before setting timestamp output\n\nena_phc_gettimex64() is setting the output parameter regardless\nof whether ena_com_phc_get_timestamp() succeeded or failed.\n\nWhen ena_com_phc_get_timestamp() returns an error, the timestamp\nparameter may contain uninitialized stack memory (e.g., when PHC is\ndisabled or in blocked state) or invalid hardware values. Passing\nthese to userspace via the PTP ioctl is both a security issue\n(information leak) and a correctness bug.\n\nFix by checking the return code after releasing the lock and only\nsetting the output timestamp on success.","Type":"Description","Title":"net: ena: PHC: Check return code before setting timestamp output"}]}}}