{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64028", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.028Z", "datePublished": "2026-07-19T15:39:19.102Z", "dateUpdated": "2026-07-19T15:39:19.102Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:39:19.102Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Avoid NULL return from hist_field_name() on truncation\n\nhist_field_name() returns \"\" everywhere except the fully-qualified\nVAR_REF/EXPR case, where snprintf() truncation returns NULL early\nand bypasses the bottom NULL->\"\" guard. Callers don't expect NULL:\nstrcat(expr, hist_field_name(field, 0)) at trace_events_hist.c:1758\nand the strcmp() in the sort-key match loop at :4804 both deref it.\n\nsystem and event_name are bounded by MAX_EVENT_NAME_LEN, but the\nfield name on a VAR_REF is kstrdup'd from a histogram variable\nname parsed out of the trigger string and has no length cap, so\na long enough var name in a fully qualified reference can reach\nthe truncation path.\n\nKeep the length check but leave field_name as \"\" on overflow."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_hist.c"], "versions": [{"version": "2e8578364061c4e88ae33bc20c2d6f64f365f6a2", "lessThan": "e3f5d42cdc2f167719564693675f1eead81378ea", "status": "affected", "versionType": "git"}, {"version": "dfd1cd57ee6067301841b7b0967c70f910a51150", "lessThan": "37377b39ff86dacbc533275c1155210d4fd5dc91", "status": "affected", "versionType": "git"}, {"version": "e5c223f46c2e0691461dd97510c15e1f77148872", "lessThan": "0402a1d3ddec565132867337ed44514a09d84728", "status": "affected", "versionType": "git"}, {"version": "9399a92989354e34086f9a5c379493217df83c5e", "lessThan": "e91687643c440ca3997d67646e6f80b92edc6703", "status": "affected", "versionType": "git"}, {"version": "3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0", "lessThan": "be4e99038c1603fa6b329d8ee3e364825e17c353", "status": "affected", "versionType": "git"}, {"version": "0402c60abe769098d77f3b3bd1e29a97922b614b", "lessThan": "d6c8b3ebdcdb12b59ad4212acb137cc56cae453d", "status": "affected", "versionType": "git"}, {"version": "6929e650db8451a9975ac0a631ba2d6e5d1e80ba", "lessThan": "915c1254fe0788abddc31095b360e9dc98907a34", "status": "affected", "versionType": "git"}, {"version": "5ec1d1e97de134beed3a5b08235a60fc1c51af96", "lessThan": "576ec047d20b368b43c4d5db98c4f2e0f3c101ec", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_hist.c"], "versions": [{"version": "6.6.141", "lessThan": "6.6.142", "status": "affected", "versionType": "semver"}, {"version": "6.12.91", "lessThan": "6.12.92", "status": "affected", "versionType": "semver"}, {"version": "6.18.33", "lessThan": "6.18.34", "status": "affected", "versionType": "semver"}, {"version": "7.0.10", "lessThan": "7.0.11", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.141", "versionEndExcluding": "6.6.142"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.91", "versionEndExcluding": "6.12.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.33", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.10", "versionEndExcluding": "7.0.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea"}, {"url": "https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91"}, {"url": "https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728"}, {"url": "https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703"}, {"url": "https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353"}, {"url": "https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d"}, {"url": "https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34"}, {"url": "https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec"}], "title": "tracing: Avoid NULL return from hist_field_name() on truncation", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/trace/trace_events_hist.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e3f5d42cdc2f167719564693675f1eead81378ea", "status": "affected", "version": "2e8578364061c4e88ae33bc20c2d6f64f365f6a2", "versionType": "git"}, {"lessThan": "37377b39ff86dacbc533275c1155210d4fd5dc91", "status": "affected", "version": "dfd1cd57ee6067301841b7b0967c70f910a51150", "versionType": "git"}, {"lessThan": "0402a1d3ddec565132867337ed44514a09d84728", "status": "affected", "version": "e5c223f46c2e0691461dd97510c15e1f77148872", "versionType": "git"}, {"lessThan": "e91687643c440ca3997d67646e6f80b92edc6703", "status": "affected", "version": "9399a92989354e34086f9a5c379493217df83c5e", "versionType": "git"}, {"lessThan": "be4e99038c1603fa6b329d8ee3e364825e17c353", "status": "affected", "version": "3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0", "versionType": "git"}, {"lessThan": "d6c8b3ebdcdb12b59ad4212acb137cc56cae453d", "status": "affected", "version": "0402c60abe769098d77f3b3bd1e29a97922b614b", "versionType": "git"}, {"lessThan": "915c1254fe0788abddc31095b360e9dc98907a34", "status": "affected", "version": "6929e650db8451a9975ac0a631ba2d6e5d1e80ba", "versionType": "git"}, {"lessThan": "576ec047d20b368b43c4d5db98c4f2e0f3c101ec", "status": "affected", "version": "5ec1d1e97de134beed3a5b08235a60fc1c51af96", "versionType": "git"}]}, {"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/trace/trace_events_hist.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "6.6.142", "status": "affected", "version": "6.6.141", "versionType": "semver"}, {"lessThan": "6.12.92", "status": "affected", "version": "6.12.91", "versionType": "semver"}, {"lessThan": "6.18.34", "status": "affected", "version": "6.18.33", "versionType": "semver"}, {"lessThan": "7.0.11", "status": "affected", "version": "7.0.10", "versionType": "semver"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Avoid NULL return from hist_field_name() on truncation\n\nhist_field_name() returns \"\" everywhere except the fully-qualified\nVAR_REF/EXPR case, where snprintf() truncation returns NULL early\nand bypasses the bottom NULL->\"\" guard. Callers don't expect NULL:\nstrcat(expr, hist_field_name(field, 0)) at trace_events_hist.c:1758\nand the strcmp() in the sort-key match loop at :4804 both deref it.\n\nsystem and event_name are bounded by MAX_EVENT_NAME_LEN, but the\nfield name on a VAR_REF is kstrdup'd from a histogram variable\nname parsed out of the trigger string and has no length cap, so\na long enough var name in a fully qualified reference can reach\nthe truncation path.\n\nKeep the length check but leave field_name as \"\" on overflow."}], "id": "CVE-2026-64028", "lastModified": "2026-07-30T14:59:47.950", "metrics": {}, "published": "2026-07-19T16:17:42.877", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: tracing: Avoid NULL return from hist_field_name() on truncation", "id": "2502314", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502314"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntracing: Avoid NULL return from hist_field_name() on truncation\nhist_field_name() returns \"\" everywhere except the fully-qualified\nVAR_REF/EXPR case, where snprintf() truncation returns NULL early\nand bypasses the bottom NULL->\"\" guard. Callers don't expect NULL:\nstrcat(expr, hist_field_name(field, 0)) at trace_events_hist.c:1758\nand the strcmp() in the sort-key match loop at :4804 both deref it.\nsystem and event_name are bounded by MAX_EVENT_NAME_LEN, but the\nfield name on a VAR_REF is kstrdup'd from a histogram variable\nname parsed out of the trigger string and has no length cap, so\na long enough var name in a fully qualified reference can reach\nthe truncation path.\nKeep the length check but leave field_name as \"\" on overflow.", "A flaw was found in the Linux kernel's tracing subsystem. The `hist_field_name()` function, responsible for handling field names, can return a NULL value if a long variable name in a fully-qualified reference causes `snprintf()` truncation. This unexpected NULL return can lead to a NULL pointer dereference when other functions attempt to use the returned value, potentially causing a system crash and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-64028", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64028\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64028\nhttps://lore.kernel.org/linux-cve-announce/2026071903-CVE-2026-64028-1c01@gregkh/T"], "threat_severity": "Low"}

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