CVE-2026-89568

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89568", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.726Z", "datePublished": "2026-09-11T19:44:38.078Z", "dateUpdated": "2026-10-19T08:49:01.653Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:49:01.653Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkho: fix size calculation in kho_preserved_memory_reserve()\n\nkho_preserved_memory_reserve() calculates the size of a preservation by\ndoing 1 << (order + PAGE_SHIFT). Since the '1' is a 32-bit integer, it\ncan only be shifted by 31. That is, it will only work for preservations\nup to 2 GiB. Larger preservations will trigger undefined behaviour.\n\nWhile preservations larger than 2 GiB can't be obtained via folios\ncurrently, they can be obtained via kho_preserve_pages().\n\nFor example, memblock reserve_mem uses kho_preserve_pages().\nReservations larger than 2 GiB are valid and will trigger this bug if\nproperly aligned.\n\nFix it by using 1UL for shifting."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/liveupdate/kexec_handover.c"], "versions": [{"version": "fc33e4b44b2717feba2f6f07ce7943a96499c9ec", "lessThan": "0692a8fdf0222af130c8ea97426f1c3bf3814905", "status": "affected", "versionType": "git"}, {"version": "fc33e4b44b2717feba2f6f07ce7943a96499c9ec", "lessThan": "42a6f03cf352eb6e6dbeef95e75e686f4cdb9bd1", "status": "affected", "versionType": "git"}, {"version": "fc33e4b44b2717feba2f6f07ce7943a96499c9ec", "lessThan": "3a0b8fa2eb36afc88b62a95f33f0c77c71fa5ded", "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/liveupdate/kexec_handover.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "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": "6.16", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0692a8fdf0222af130c8ea97426f1c3bf3814905"}, {"url": "https://git.kernel.org/stable/c/42a6f03cf352eb6e6dbeef95e75e686f4cdb9bd1"}, {"url": "https://git.kernel.org/stable/c/3a0b8fa2eb36afc88b62a95f33f0c77c71fa5ded"}], "title": "kho: fix size calculation in kho_preserved_memory_reserve()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/liveupdate/kexec_handover.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0692a8fdf0222af130c8ea97426f1c3bf3814905", "status": "affected", "version": "fc33e4b44b2717feba2f6f07ce7943a96499c9ec", "versionType": "git"}, {"lessThan": "42a6f03cf352eb6e6dbeef95e75e686f4cdb9bd1", "status": "affected", "version": "fc33e4b44b2717feba2f6f07ce7943a96499c9ec", "versionType": "git"}, {"lessThan": "3a0b8fa2eb36afc88b62a95f33f0c77c71fa5ded", "status": "affected", "version": "fc33e4b44b2717feba2f6f07ce7943a96499c9ec", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/liveupdate/kexec_handover.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": "6.18.57", "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\nkho: fix size calculation in kho_preserved_memory_reserve()\n\nkho_preserved_memory_reserve() calculates the size of a preservation by\ndoing 1 << (order + PAGE_SHIFT). Since the '1' is a 32-bit integer, it\ncan only be shifted by 31. That is, it will only work for preservations\nup to 2 GiB. Larger preservations will trigger undefined behaviour.\n\nWhile preservations larger than 2 GiB can't be obtained via folios\ncurrently, they can be obtained via kho_preserve_pages().\n\nFor example, memblock reserve_mem uses kho_preserve_pages().\nReservations larger than 2 GiB are valid and will trigger this bug if\nproperly aligned.\n\nFix it by using 1UL for shifting."}], "id": "CVE-2026-89568", "lastModified": "2026-10-19T09:17:52.640", "metrics": {}, "published": "2026-09-11T20:19:40.810", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0692a8fdf0222af130c8ea97426f1c3bf3814905"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3a0b8fa2eb36afc88b62a95f33f0c77c71fa5ded"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/42a6f03cf352eb6e6dbeef95e75e686f4cdb9bd1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Undefined behavior in memory reservation due to incorrect size calculation", "id": "2532296", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532296"}, "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-1335", "details": ["A flaw was found in the Linux kernel. The `kho_preserved_memory_reserve()` function, responsible for reserving memory, incorrectly calculates the size of these reservations. This issue arises because it uses a 32-bit integer for bit shifting, which limits the maximum reservation size to 2 Gigabytes (GiB). Consequently, attempts to reserve memory larger than 2 GiB can lead to undefined behavior, potentially causing system instability or a denial of service."], "name": "CVE-2026-89568", "public_date": "2026-09-11T19:44:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89568\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89568\nhttps://git.kernel.org/stable/c/3a0b8fa2eb36afc88b62a95f33f0c77c71fa5ded\nhttps://git.kernel.org/stable/c/42a6f03cf352eb6e6dbeef95e75e686f4cdb9bd1"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fc33e4b44b2717feba2f6f07ce7943a96499c9ec,42a6f03cf352eb6e6dbeef95e75e686f4cdb9bd1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fc33e4b44b2717feba2f6f07ce7943a96499c9ec,3a0b8fa2eb36afc88b62a95f33f0c77c71fa5ded)"}}], "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": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.4,*]"}}, {"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": "2026-09-12T07:00:14.276709+00:00", "updated": "2026-09-15T22:00:17.599837+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}