CVE-2026-89556

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89556", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.724Z", "datePublished": "2026-09-11T19:44:29.080Z", "dateUpdated": "2026-11-10T18:15:09.542Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-10T18:15:09.542Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmodule: validate string table section types\n\nIn elf_validity_cache_sechdrs, section sizes and offsets are validated,\nunless the section type is SHT_NULL or SHT_NOBITS.\n\nLater, elf_validity_cache_secstrings and elf_validity_cache_index_str\naccess the section name table (.shstrtab) and symbol string table\n(.strtab) headers without first ensuring that their types are\nSHT_STRTAB. If a section type is SHT_NULL or SHT_NOBITS, sh_offset has\nnot been validated and may reference out-of-bounds memory when\ndereferenced in elf_validity_cache_secstrings or\nelf_validity_cache_strtab.\n\nValidate that both string section headers are of type SHT_STRTAB before\ncaching them."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/module/main.c"], "versions": [{"version": "f19f1a1c5fe56274e95b342e8138f4b774febf97", "lessThan": "db07e9b0320e480f05f5c12e8e4d6699f0d3acb7", "status": "affected", "versionType": "git"}, {"version": "c92aab819d56d51631f0484ed7af11d9d8ff4cb0", "lessThan": "50d0aa7d25ba4bc3606f150cd69755068e79f97f", "status": "affected", "versionType": "git"}, {"version": "c92aab819d56d51631f0484ed7af11d9d8ff4cb0", "lessThan": "e4496dda2c6d0acf7ba5fbce14a2723a8935ceee", "status": "affected", "versionType": "git"}, {"version": "c92aab819d56d51631f0484ed7af11d9d8ff4cb0", "lessThan": "9a5ff45689329835f874cefe5174e577d141d423", "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/module/main.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "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": "6.13", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/db07e9b0320e480f05f5c12e8e4d6699f0d3acb7"}, {"url": "https://git.kernel.org/stable/c/50d0aa7d25ba4bc3606f150cd69755068e79f97f"}, {"url": "https://git.kernel.org/stable/c/e4496dda2c6d0acf7ba5fbce14a2723a8935ceee"}, {"url": "https://git.kernel.org/stable/c/9a5ff45689329835f874cefe5174e577d141d423"}], "title": "module: validate string table section types", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/module/main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "db07e9b0320e480f05f5c12e8e4d6699f0d3acb7", "status": "affected", "version": "f19f1a1c5fe56274e95b342e8138f4b774febf97", "versionType": "git"}, {"lessThan": "50d0aa7d25ba4bc3606f150cd69755068e79f97f", "status": "affected", "version": "c92aab819d56d51631f0484ed7af11d9d8ff4cb0", "versionType": "git"}, {"lessThan": "e4496dda2c6d0acf7ba5fbce14a2723a8935ceee", "status": "affected", "version": "c92aab819d56d51631f0484ed7af11d9d8ff4cb0", "versionType": "git"}, {"lessThan": "9a5ff45689329835f874cefe5174e577d141d423", "status": "affected", "version": "c92aab819d56d51631f0484ed7af11d9d8ff4cb0", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/module/main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.13"}, {"lessThan": "6.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "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\nmodule: validate string table section types\n\nIn elf_validity_cache_sechdrs, section sizes and offsets are validated,\nunless the section type is SHT_NULL or SHT_NOBITS.\n\nLater, elf_validity_cache_secstrings and elf_validity_cache_index_str\naccess the section name table (.shstrtab) and symbol string table\n(.strtab) headers without first ensuring that their types are\nSHT_STRTAB. If a section type is SHT_NULL or SHT_NOBITS, sh_offset has\nnot been validated and may reference out-of-bounds memory when\ndereferenced in elf_validity_cache_secstrings or\nelf_validity_cache_strtab.\n\nValidate that both string section headers are of type SHT_STRTAB before\ncaching them."}], "id": "CVE-2026-89556", "lastModified": "2026-11-10T19:21:35.403", "metrics": {}, "published": "2026-09-11T20:19:39.287", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/50d0aa7d25ba4bc3606f150cd69755068e79f97f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9a5ff45689329835f874cefe5174e577d141d423"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/db07e9b0320e480f05f5c12e8e4d6699f0d3acb7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e4496dda2c6d0acf7ba5fbce14a2723a8935ceee"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Out-of-bounds memory access via malformed ELF string tables", "id": "2532494", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532494"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel. This vulnerability arises from insufficient validation of string table section types within ELF (Executable and Linkable Format) files. A local attacker could exploit this by providing a specially crafted ELF module, leading to the kernel attempting to access memory outside of its allocated boundaries. This out-of-bounds memory access could result in system instability, causing a denial of service, or potentially lead to the disclosure of sensitive information."], "name": "CVE-2026-89556", "public_date": "2026-09-11T19:44:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89556\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89556\nhttps://git.kernel.org/stable/c/50d0aa7d25ba4bc3606f150cd69755068e79f97f\nhttps://git.kernel.org/stable/c/9a5ff45689329835f874cefe5174e577d141d423\nhttps://git.kernel.org/stable/c/e4496dda2c6d0acf7ba5fbce14a2723a8935ceee"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,50d0aa7d25ba4bc3606f150cd69755068e79f97f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e4496dda2c6d0acf7ba5fbce14a2723a8935ceee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,9a5ff45689329835f874cefe5174e577d141d423)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.50)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.2.4)"}}], "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": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.50,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.4,7.2.*]"}}, {"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": "2026-09-12T10:00:08.636645+00:00", "updated": "2026-09-15T22:30:15.255612+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}