CVE-2026-46130

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In that case, each\ncall to fec_decode_bufs() consumes v->fec->roots * (fio->nbufs <<\nDM_VERITY_FEC_BUF_RS_BITS) = 272 parity bytes.\n\nConsidering that the parity data for each message block starts on a\nblock boundary, the byte alignment in the parity data will iterate\nthrough 272*i mod 4096 until the 3 parity blocks have been consumed. On\nthe 16th call (i=15), the alignment will be 4080 bytes into the first\nblock. Only 16 bytes remain in that block, but 17 parity bytes will be\nneeded. The code reads out-of-bounds from the parity block buffer.\n\nFortunately this doesn't normally happen, since it can occur only for\ncertain non-default values of fec_roots *and* when the maximum number of\nbuffers couldn't be allocated due to low memory. For example with\nblock_size=4096 only the following cases are affected:\n\n fec_roots=17: nbufs in [1, 3, 5, 15]\n fec_roots=19: nbufs in [1, 229]\n fec_roots=21: nbufs in [1, 3, 5, 13, 15, 39, 65, 195]\n fec_roots=23: nbufs in [1, 89]\n\nRegardless, fix it by refactoring how the parity blocks are read."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/dm-verity-fec.c"], "versions": [{"version": "12caa73a28f0ae147ec0356b45091edf2462462b", "lessThan": "03348b440f69417dc3a3c71d8271cff6b05f67fb", "status": "affected", "versionType": "git"}, {"version": "fc8943886629e26de34867db302c74d465510826", "lessThan": "dac69d1b76049d7e5f565089a6a7f4502a85b9de", "status": "affected", "versionType": "git"}, {"version": "6df90c02bae468a3a6110bafbc659884d0c4966c", "lessThan": "d47281b9a4472cfd73122393e79fbe76b651e46a", "status": "affected", "versionType": "git"}, {"version": "6df90c02bae468a3a6110bafbc659884d0c4966c", "lessThan": "3d1b4e2d8ac0a1a1390a117f61ce0ca1c47e3bcb", "status": "affected", "versionType": "git"}, {"version": "6df90c02bae468a3a6110bafbc659884d0c4966c", "lessThan": "430a05cb926f6bdf53e81460a2c3a553257f3f61", "status": "affected", "versionType": "git"}, {"version": "6bc6ee31113b05db605694491bdeb2b1730142f1", "status": "affected", "versionType": "git"}, {"version": "6.6.72", "lessThan": "6.6.160", "status": "affected", "versionType": "semver"}, {"version": "6.12.10", "lessThan": "6.12.114", "status": "affected", "versionType": "semver"}, {"version": "6.1.125", "lessThan": "6.2", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/dm-verity-fec.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.7", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.6.72", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.10", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.0.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.125"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/03348b440f69417dc3a3c71d8271cff6b05f67fb"}, {"url": "https://git.kernel.org/stable/c/dac69d1b76049d7e5f565089a6a7f4502a85b9de"}, {"url": "https://git.kernel.org/stable/c/d47281b9a4472cfd73122393e79fbe76b651e46a"}, {"url": "https://git.kernel.org/stable/c/3d1b4e2d8ac0a1a1390a117f61ce0ca1c47e3bcb"}, {"url": "https://git.kernel.org/stable/c/430a05cb926f6bdf53e81460a2c3a553257f3f61"}], "title": "dm-verity-fec: fix reading parity bytes split across blocks (take 3)", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-46130", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:09:22.162738Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:13:39.086Z"}}]}}

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Consider v->fec->block_size == 4096 &&\nv->fec->roots == 17 && fio->nbufs == 1, for example. In that case, each\ncall to fec_decode_bufs() consumes v->fec->roots * (fio->nbufs <<\nDM_VERITY_FEC_BUF_RS_BITS) = 272 parity bytes.\n\nConsidering that the parity data for each message block starts on a\nblock boundary, the byte alignment in the parity data will iterate\nthrough 272*i mod 4096 until the 3 parity blocks have been consumed. On\nthe 16th call (i=15), the alignment will be 4080 bytes into the first\nblock. Only 16 bytes remain in that block, but 17 parity bytes will be\nneeded. The code reads out-of-bounds from the parity block buffer.\n\nFortunately this doesn't normally happen, since it can occur only for\ncertain non-default values of fec_roots *and* when the maximum number of\nbuffers couldn't be allocated due to low memory. For example with\nblock_size=4096 only the following cases are affected:\n\n fec_roots=17: nbufs in [1, 3, 5, 15]\n fec_roots=19: nbufs in [1, 229]\n fec_roots=21: nbufs in [1, 3, 5, 13, 15, 39, 65, 195]\n fec_roots=23: nbufs in [1, 89]\n\nRegardless, fix it by refactoring how the parity blocks are read."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.160", "versionStartIncluding": "6.6.72"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.114", "versionStartIncluding": "6.12.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.7", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.1.125"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:41:19.483Z"}}}, "cveMetadata": {"cveId": "CVE-2026-46130", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:13:39.086Z", "dateReserved": "2026-05-13T15:03:33.099Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-28T09:35:45.387Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Consider v->fec->block_size == 4096 &&\nv->fec->roots == 17 && fio->nbufs == 1, for example. In that case, each\ncall to fec_decode_bufs() consumes v->fec->roots * (fio->nbufs <<\nDM_VERITY_FEC_BUF_RS_BITS) = 272 parity bytes.\n\nConsidering that the parity data for each message block starts on a\nblock boundary, the byte alignment in the parity data will iterate\nthrough 272*i mod 4096 until the 3 parity blocks have been consumed. On\nthe 16th call (i=15), the alignment will be 4080 bytes into the first\nblock. Only 16 bytes remain in that block, but 17 parity bytes will be\nneeded. The code reads out-of-bounds from the parity block buffer.\n\nFortunately this doesn't normally happen, since it can occur only for\ncertain non-default values of fec_roots *and* when the maximum number of\nbuffers couldn't be allocated due to low memory. For example with\nblock_size=4096 only the following cases are affected:\n\n fec_roots=17: nbufs in [1, 3, 5, 15]\n fec_roots=19: nbufs in [1, 229]\n fec_roots=21: nbufs in [1, 3, 5, 13, 15, 39, 65, 195]\n fec_roots=23: nbufs in [1, 89]\n\nRegardless, fix it by refactoring how the parity blocks are read."}], "id": "CVE-2026-46130", "lastModified": "2026-11-06T17:17:39.003", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46130", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:09:22.162738Z", "version": "2.0.3"}}]}, "published": "2026-05-28T10:16:28.570", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/03348b440f69417dc3a3c71d8271cff6b05f67fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d1b4e2d8ac0a1a1390a117f61ce0ca1c47e3bcb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/430a05cb926f6bdf53e81460a2c3a553257f3f61"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d47281b9a4472cfd73122393e79fbe76b651e46a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dac69d1b76049d7e5f565089a6a7f4502a85b9de"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: dm-verity-fec: fix reading parity bytes split across blocks (take 3)", "id": "2482662", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482662"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-823", "details": ["A flaw was found in the Linux kernel's device-mapper verity forward error correction (dm-verity-fec) component. This vulnerability occurs because a function responsible for decoding parity data makes an incorrect assumption about how these data blocks are read. Under specific, non-default configurations and low memory conditions, this can lead to an out-of-bounds read, where the system attempts to access memory beyond its allocated buffer. Such an issue could potentially result in system instability or the disclosure of sensitive information."], "name": "CVE-2026-46130", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "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"}], "public_date": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46130\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46130\nhttps://lore.kernel.org/linux-cve-announce/2026052817-CVE-2026-46130-895e@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6df90c02bae468a3a6110bafbc659884d0c4966c,3d1b4e2d8ac0a1a1390a117f61ce0ca1c47e3bcb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6df90c02bae468a3a6110bafbc659884d0c4966c,430a05cb926f6bdf53e81460a2c3a553257f3f61)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6bc6ee31113b05db605694491bdeb2b1730142f1,6bc6ee31113b05db605694491bdeb2b1730142f1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[12caa73a28f0ae147ec0356b45091edf2462462b,12caa73a28f0ae147ec0356b45091edf2462462b]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fc8943886629e26de34867db302c74d465510826,fc8943886629e26de34867db302c74d465510826]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.1.125,6.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.6.72,6.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.12.10,6.13)"}}], "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": "[6.13,6.13]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.7,7.1.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-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": "2026-05-28T12:15:19.716924+00:00", "updated": "2026-08-12T03:45:17.573080+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-125", "CWE-823"]}