CVE-2026-72098

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Inside the\nRS decoder (lib/reed_solomon/decode_rs.c:113-121), the erasure locator\npolynomial loop writes lambda[j] where j can reach nroots + 1 \u2014 one\nelement past the end of lambda[] (which is sized nroots + 1, valid\nindices 0..nroots). 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host, and unprivileged local processes with read access to the mapped device or filesystem can also reach the vulnerable FEC path.\nUI:N - Exploitation is driven by automatic boot-time reads, udev probing, or ordinary filesystem I/O on the dm-verity device; no specific victim action beyond normal system operation is required once corruption is present.\nS:U - The overflow corrupts kernel heap Reed-Solomon scratch buffers during dm-verity verification within the same kernel security authority; it does not by itself cross VM, IOMMU, or sandbox boundaries.\nC:H - The inflated no_eras value causes decode_rs8 to XOR-write one uint16 past lambda[] into syn[0], corrupting adjacent kernel decoder state; such heap out-of-bounds writes can be leveraged for arbitrary memory disclosure.\nI:H - The same out-of-bounds write in the erasure-locator loop corrupts syndrome buffers later used to modify decoded message bytes, providing a heap memory-corruption primitive that can enable arbitrary kernel 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"https://git.kernel.org/stable/c/31d6e6c0ba8d5a7bd59660035a089307100c5e8e"}], "title": "dm-verity: fix buffer overflow in FEC calculation", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72098", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:51:49.534768Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T21:19:27.528Z"}}]}}

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a remote NBD/iSCSI peer needs no account or privileges on the victim host, and unprivileged local processes with read access to the mapped device or filesystem can also reach the vulnerable FEC path.\nUI:N - Exploitation is driven by automatic boot-time reads, udev probing, or ordinary filesystem I/O on the dm-verity device; no specific victim action beyond normal system operation is required once corruption is present.\nS:U - The overflow corrupts kernel heap Reed-Solomon scratch buffers during dm-verity verification within the same kernel security authority; it does not by itself cross VM, IOMMU, or sandbox boundaries.\nC:H - The inflated no_eras value causes decode_rs8 to XOR-write one uint16 past lambda[] into syn[0], corrupting adjacent kernel decoder state; such heap out-of-bounds writes can be leveraged for arbitrary memory disclosure.\nI:H - The same out-of-bounds write in the erasure-locator loop corrupts syndrome buffers later used to modify decoded message bytes, providing a heap memory-corruption primitive that can enable arbitrary kernel writes or control-flow hijacking.\nA:H - Corrupting Reed-Solomon decoder state during dm-verity verification can cause kernel oops, panics, or hung I/O on critical read-only partitions (notably Android/embedded systems with FEC enabled), denying availability of the device or entire system."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70", "lessThan": "374775626c327aec2425c16b4d36706e5f8718b8", "versionType": "git"}, {"status": "affected", "version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70", "lessThan": "dc662eed1c432cc2fd4e9314f58d30b3a8cca7cc", "versionType": "git"}, {"status": "affected", "version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70", "lessThan": "5488d3a69d205e28f74f18857b853aa12e778e66", "versionType": "git"}, {"status": "affected", "version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70", "lessThan": "f7990c2b0f08b8841fcd2652d1d7002f5994a7a7", "versionType": "git"}, {"status": "affected", "version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70", "lessThan": "31d6e6c0ba8d5a7bd59660035a089307100c5e8e", "versionType": "git"}], "programFiles": ["drivers/md/dm-verity-fec.c", "drivers/md/dm-verity-fec.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.5"}, {"status": "unaffected", "version": "0", "lessThan": "4.5", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.160", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.114", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.42", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/md/dm-verity-fec.c", "drivers/md/dm-verity-fec.h"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/374775626c327aec2425c16b4d36706e5f8718b8"}, {"url": "https://git.kernel.org/stable/c/dc662eed1c432cc2fd4e9314f58d30b3a8cca7cc"}, {"url": "https://git.kernel.org/stable/c/5488d3a69d205e28f74f18857b853aa12e778e66"}, {"url": "https://git.kernel.org/stable/c/f7990c2b0f08b8841fcd2652d1d7002f5994a7a7"}, {"url": "https://git.kernel.org/stable/c/31d6e6c0ba8d5a7bd59660035a089307100c5e8e"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity: fix buffer overflow in FEC calculation\n\nThere's a buffer overflow in dm-verity-fec:\n\nif (neras && *neras <= v->fec->roots)\n\tfio->erasures[(*neras)++] = i;\n\nThis allows *neras to reach roots + 1 (the post-increment pushes it past\nroots). 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The out-of-bounds write lands on syn[0], corrupting\nthe syndrome buffer."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.160", "versionStartIncluding": "4.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.114", "versionStartIncluding": "4.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "4.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "4.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "4.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:44:22.026Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72098", "state": "PUBLISHED", "dateUpdated": "2026-10-21T12:44:22.026Z", "dateReserved": "2026-08-09T03:40:39.905Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:52:43.666Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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{"bugzilla": {"description": "kernel: dm-verity: fix buffer overflow in FEC calculation", "id": "2516501", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516501"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the dm-verity component of the Linux kernel. A buffer overflow occurs during Forward Error Correction (FEC) calculation, allowing an attacker to write past the end of an allocated buffer. This out-of-bounds write can corrupt the syndrome buffer, potentially leading to system instability or other undefined behavior."], "name": "CVE-2026-72098", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72098\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72098\nhttps://lore.kernel.org/linux-cve-announce/2026081524-CVE-2026-72098-cbda@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a739ff3f543afbb4a041c16cd0182c8e8d366e70,5488d3a69d205e28f74f18857b853aa12e778e66)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a739ff3f543afbb4a041c16cd0182c8e8d366e70,f7990c2b0f08b8841fcd2652d1d7002f5994a7a7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a739ff3f543afbb4a041c16cd0182c8e8d366e70,31d6e6c0ba8d5a7bd59660035a089307100c5e8e)"}}], "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": "4.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc3,*]"}}], "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": "2026-08-15T08:30:06.146706+00:00", "updated": "2026-08-18T04:45:04.412443+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}