CVE-2026-68176

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68176", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.372Z", "datePublished": "2026-08-10T11:59:47.298Z", "dateUpdated": "2026-08-19T16:30:41.982Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:30:41.982Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix mmiotrace possible NULL dereferencing of hiter->dev\n\nIf the mmio_pipe_open() fails to find a PCI device, the hiter->dev\nwill be assigned to NULL. The mmiotrace read() function dereferences the\nhiter->dev if hiter exists.\n\nChange the test of the read to not only check hiter being NULL, but also\nthe hiter->dev before dereferencing it."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_mmiotrace.c"], "versions": [{"version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "lessThan": "c06470320f8156306986a831010cdc9f9f87cb50", "status": "affected", "versionType": "git"}, {"version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "lessThan": "0d5aaf91a3d05f7f993401af27872a5fc0f26edc", "status": "affected", "versionType": "git"}, {"version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "lessThan": "3635a9e8b453e658a49b39d025f35bbc6e58d0e2", "status": "affected", "versionType": "git"}, {"version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "lessThan": "faaf95135184208ee3ac6f33175c8d1800669dfc", "status": "affected", "versionType": "git"}, {"version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "lessThan": "201a01102c529772168181190cb084471082cf5c", "status": "affected", "versionType": "git"}, {"version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "lessThan": "8464427e1c177809a9488a97dfa2807d9dcf323b", "status": "affected", "versionType": "git"}, {"version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "lessThan": "724cd84b0546c07806840fa658714488553d13a2", "status": "affected", "versionType": "git"}, {"version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "lessThan": "144f29e85702234b23d2a62abf723e6a17eb5427", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_mmiotrace.c"], "versions": [{"version": "2.6.27", "status": "affected"}, {"version": "0", "lessThan": "2.6.27", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c06470320f8156306986a831010cdc9f9f87cb50"}, {"url": "https://git.kernel.org/stable/c/0d5aaf91a3d05f7f993401af27872a5fc0f26edc"}, {"url": "https://git.kernel.org/stable/c/3635a9e8b453e658a49b39d025f35bbc6e58d0e2"}, {"url": "https://git.kernel.org/stable/c/faaf95135184208ee3ac6f33175c8d1800669dfc"}, {"url": "https://git.kernel.org/stable/c/201a01102c529772168181190cb084471082cf5c"}, {"url": "https://git.kernel.org/stable/c/8464427e1c177809a9488a97dfa2807d9dcf323b"}, {"url": "https://git.kernel.org/stable/c/724cd84b0546c07806840fa658714488553d13a2"}, {"url": "https://git.kernel.org/stable/c/144f29e85702234b23d2a62abf723e6a17eb5427"}], "title": "tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/trace/trace_mmiotrace.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c06470320f8156306986a831010cdc9f9f87cb50", "status": "affected", "version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "versionType": "git"}, {"lessThan": "0d5aaf91a3d05f7f993401af27872a5fc0f26edc", "status": "affected", "version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "versionType": "git"}, {"lessThan": "3635a9e8b453e658a49b39d025f35bbc6e58d0e2", "status": "affected", "version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "versionType": "git"}, {"lessThan": "faaf95135184208ee3ac6f33175c8d1800669dfc", "status": "affected", "version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "versionType": "git"}, {"lessThan": "201a01102c529772168181190cb084471082cf5c", "status": "affected", "version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "versionType": "git"}, {"lessThan": "8464427e1c177809a9488a97dfa2807d9dcf323b", "status": "affected", "version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "versionType": "git"}, {"lessThan": "724cd84b0546c07806840fa658714488553d13a2", "status": "affected", "version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "versionType": "git"}, {"lessThan": "144f29e85702234b23d2a62abf723e6a17eb5427", "status": "affected", "version": "f984b51e0779a6dd30feedc41404013ca54e5d05", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/trace/trace_mmiotrace.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.27"}, {"lessThan": "2.6.27", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix mmiotrace possible NULL dereferencing of hiter->dev\n\nIf the mmio_pipe_open() fails to find a PCI device, the hiter->dev\nwill be assigned to NULL. The mmiotrace read() function dereferences the\nhiter->dev if hiter exists.\n\nChange the test of the read to not only check hiter being NULL, but also\nthe hiter->dev before dereferencing it."}], "id": "CVE-2026-68176", "lastModified": "2026-08-19T17:20:34.080", "metrics": {}, "published": "2026-08-10T13:20:04.490", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0d5aaf91a3d05f7f993401af27872a5fc0f26edc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/144f29e85702234b23d2a62abf723e6a17eb5427"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/201a01102c529772168181190cb084471082cf5c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3635a9e8b453e658a49b39d025f35bbc6e58d0e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/724cd84b0546c07806840fa658714488553d13a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8464427e1c177809a9488a97dfa2807d9dcf323b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c06470320f8156306986a831010cdc9f9f87cb50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/faaf95135184208ee3ac6f33175c8d1800669dfc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Kernel: Null pointer dereference in mmiotrace can lead to denial of service", "id": "2513208", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513208"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/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: Fix mmiotrace possible NULL dereferencing of hiter->dev\nIf the mmio_pipe_open() fails to find a PCI device, the hiter->dev\nwill be assigned to NULL. The mmiotrace read() function dereferences the\nhiter->dev if hiter exists.\nChange the test of the read to not only check hiter being NULL, but also\nthe hiter->dev before dereferencing it.", "A flaw was found in the Linux kernel's mmiotrace component. When `mmio_pipe_open()` fails to find a PCI device, a null pointer is assigned to `hiter->dev`. The `mmiotrace read()` function then attempts to dereference this null pointer, which can lead to a system crash and result in a denial of service. A local attacker could potentially exploit this to cause system instability."], "name": "CVE-2026-68176", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T11:59:47Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68176\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68176\nhttps://git.kernel.org/stable/c/144f29e85702234b23d2a62abf723e6a17eb5427\nhttps://git.kernel.org/stable/c/201a01102c529772168181190cb084471082cf5c\nhttps://git.kernel.org/stable/c/724cd84b0546c07806840fa658714488553d13a2\nhttps://git.kernel.org/stable/c/8464427e1c177809a9488a97dfa2807d9dcf323b\nhttps://git.kernel.org/stable/c/faaf95135184208ee3ac6f33175c8d1800669dfc"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f984b51e0779a6dd30feedc41404013ca54e5d05,faaf95135184208ee3ac6f33175c8d1800669dfc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f984b51e0779a6dd30feedc41404013ca54e5d05,201a01102c529772168181190cb084471082cf5c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f984b51e0779a6dd30feedc41404013ca54e5d05,724cd84b0546c07806840fa658714488553d13a2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f984b51e0779a6dd30feedc41404013ca54e5d05,8464427e1c177809a9488a97dfa2807d9dcf323b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f984b51e0779a6dd30feedc41404013ca54e5d05,144f29e85702234b23d2a62abf723e6a17eb5427)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.27"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.27)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T17:45:04.363932+00:00", "updated": "2026-08-13T08:15:05.071007+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}