CVE-2026-89745

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89745", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.762Z", "datePublished": "2026-09-11T19:46:50.758Z", "dateUpdated": "2026-10-19T08:51:59.176Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:51:59.176Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndebugfs: Fix lockdown check for mmap_prepare\n\nCommit 651fdda8406d (\"relay: update relay to use mmap_prepare\")\nchanged the `mmap` file operation to `mmap_prepare` for relayfs, but\nthe lockdown check in debugfs was not updated accordingly.\n\nThis prevents debugfs from being locked down when the kernel is in\nintegrity mode if a file uses `mmap_prepare` but not `mmap`.\n\nSince the conversion to `mmap_prepare` across the kernel is not yet\ncomplete, update the lockdown check to look for both `mmap` and\n`mmap_prepare` to ensure comprehensive coverage."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/debugfs/file.c"], "versions": [{"version": "651fdda8406d42a5004c5c79f269540a85d6a1ab", "lessThan": "e7f6a6b5741d16fdac7adaecbe0fa52ae756f208", "status": "affected", "versionType": "git"}, {"version": "651fdda8406d42a5004c5c79f269540a85d6a1ab", "lessThan": "f81808de37338aac8e167f99bfae647b1b835c70", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/debugfs/file.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.19", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e7f6a6b5741d16fdac7adaecbe0fa52ae756f208"}, {"url": "https://git.kernel.org/stable/c/f81808de37338aac8e167f99bfae647b1b835c70"}], "title": "debugfs: Fix lockdown check for mmap_prepare", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/debugfs/file.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e7f6a6b5741d16fdac7adaecbe0fa52ae756f208", "status": "affected", "version": "651fdda8406d42a5004c5c79f269540a85d6a1ab", "versionType": "git"}, {"lessThan": "f81808de37338aac8e167f99bfae647b1b835c70", "status": "affected", "version": "651fdda8406d42a5004c5c79f269540a85d6a1ab", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/debugfs/file.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.19"}, {"lessThan": "6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\ndebugfs: Fix lockdown check for mmap_prepare\n\nCommit 651fdda8406d (\"relay: update relay to use mmap_prepare\")\nchanged the `mmap` file operation to `mmap_prepare` for relayfs, but\nthe lockdown check in debugfs was not updated accordingly.\n\nThis prevents debugfs from being locked down when the kernel is in\nintegrity mode if a file uses `mmap_prepare` but not `mmap`.\n\nSince the conversion to `mmap_prepare` across the kernel is not yet\ncomplete, update the lockdown check to look for both `mmap` and\n`mmap_prepare` to ensure comprehensive coverage."}], "id": "CVE-2026-89745", "lastModified": "2026-10-19T09:18:17.420", "metrics": {}, "published": "2026-09-11T20:20:05.260", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e7f6a6b5741d16fdac7adaecbe0fa52ae756f208"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f81808de37338aac8e167f99bfae647b1b835c70"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux Kernel: Debugfs lockdown bypass due to incomplete mmap_prepare check", "id": "2532369", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532369"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-414", "details": ["A flaw was found in the Linux kernel's debugfs component. The lockdown mechanism, designed to enhance system integrity, did not properly account for files using the `mmap_prepare` operation. This oversight could allow an attacker to bypass kernel lockdown restrictions when the system is operating in integrity mode, potentially compromising system integrity."], "name": "CVE-2026-89745", "public_date": "2026-09-11T19:46:50Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89745\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89745\nhttps://git.kernel.org/stable/c/e7f6a6b5741d16fdac7adaecbe0fa52ae756f208\nhttps://git.kernel.org/stable/c/f81808de37338aac8e167f99bfae647b1b835c70"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[651fdda8406d42a5004c5c79f269540a85d6a1ab,e7f6a6b5741d16fdac7adaecbe0fa52ae756f208)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[651fdda8406d42a5004c5c79f269540a85d6a1ab,f81808de37338aac8e167f99bfae647b1b835c70)"}}], "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": "generic", "value": "6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "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": "2026-09-12T08:00:11.013220+00:00", "updated": "2026-09-15T19:30:12.127898+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}