{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74376", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.889Z", "datePublished": "2026-08-15T05:58:55.023Z", "dateUpdated": "2026-08-17T05:46:28.657Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:46:28.657Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid10: reset read_slot when reusing r10bio for discard\n\nput_all_bios() always drops devs[i].bio, but it only drops\ndevs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an\nr10bio that was previously used for a read, read_slot can still be\nnon-negative, and discard cleanup can skip bio_put() on repl_bio.\n\nReset read_slot to -1 when preparing an r10bio for discard so the\nreplacement bio is always released correctly."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - iSCSI/NVMe-oF targets and appliances commonly expose RAID10-backed LUNs; remote SCSI UNMAP maps through target_core iblock_execute_unmap()/blkdev_issue_discard() to md_handle_request() and raid10_handle_discard without local access.\nAC:L - The attacker controls both pool poisoning reads and triggering discards; mempool-reused r10bios retain a non-negative read_slot from prior reads, so each qualifying discard reliably skips repl_bio bio_put() when replacement mirrors exist.\nPR:N - Network UNMAP from an iSCSI/NVMe-oF client needs no Linux UID or capabilities on the target; local exploitation only needs O_RDWR on the md device or FITRIM (CAP_SYS_ADMIN, obtainable in user namespaces), both below High.\nUI:N - No interactive victim action\u2014exploitation uses normal block-layer discard requests (fstrim cron, UNMAP, BLKDISCARD) issued or scripted by the attacker without cooperation.\nS:U - The bug corrupts/leaks kernel bio objects within the same host kernel security domain; it does not cross VM, container, or IOMMU boundaries.\nC:H - Stale read_slot misclassifies repl_bio as rdev in the r10dev union during put_all_bios(), leaking live bios holding kernel pointers and enabling heap-grooming read primitives; scored High when uncertain per memory-corruption guidance.\nI:H - The read_slot/repl_bio union type confusion skips bio_put() on attacker-submitted replacement discard clones, enabling slab manipulation for arbitrary kernel writes; type confusion maps to High integrity impact per kernel CVSS guidance.\nA:H - Repeated read-then-discard cycles leak bios on every hit; on busy RAID10 storage servers this exhausts kmem and can trigger OOM killer or panic, so Availability is High rather than Low per the conservative rule."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/raid10.c"], "versions": [{"version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "lessThan": "3cb2a606ce4902eceabe68338df0653312f861f8", "status": "affected", "versionType": "git"}, {"version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "lessThan": "561c9711e4f545d6464a023168bdee03b00fa945", "status": "affected", "versionType": "git"}, {"version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "lessThan": "ce3030e92f14362880055de5fe3c258971118853", "status": "affected", "versionType": "git"}, {"version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "lessThan": "742e4afd247d9c972695227716b03d432a7e1d26", "status": "affected", "versionType": "git"}, {"version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "lessThan": "b7313f23ea5a79b199a007bfad64a866cc2c22e7", "status": "affected", "versionType": "git"}, {"version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "lessThan": "eb04e3e9c14ed15914f5fd2eae8b6435f54f095f", "status": "affected", "versionType": "git"}, {"version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "lessThan": "6b8a26af065ddc93de2aa5c9f0df98dce9723442", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/raid10.c"], "versions": [{"version": "5.13", "status": "affected"}, {"version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.13", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3cb2a606ce4902eceabe68338df0653312f861f8"}, {"url": "https://git.kernel.org/stable/c/561c9711e4f545d6464a023168bdee03b00fa945"}, {"url": "https://git.kernel.org/stable/c/ce3030e92f14362880055de5fe3c258971118853"}, {"url": "https://git.kernel.org/stable/c/742e4afd247d9c972695227716b03d432a7e1d26"}, {"url": "https://git.kernel.org/stable/c/b7313f23ea5a79b199a007bfad64a866cc2c22e7"}, {"url": "https://git.kernel.org/stable/c/eb04e3e9c14ed15914f5fd2eae8b6435f54f095f"}, {"url": "https://git.kernel.org/stable/c/6b8a26af065ddc93de2aa5c9f0df98dce9723442"}], "title": "md/raid10: reset read_slot when reusing r10bio for discard", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/md/raid10.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3cb2a606ce4902eceabe68338df0653312f861f8", "status": "affected", "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "versionType": "git"}, {"lessThan": "561c9711e4f545d6464a023168bdee03b00fa945", "status": "affected", "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "versionType": "git"}, {"lessThan": "ce3030e92f14362880055de5fe3c258971118853", "status": "affected", "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "versionType": "git"}, {"lessThan": "742e4afd247d9c972695227716b03d432a7e1d26", "status": "affected", "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "versionType": "git"}, {"lessThan": "b7313f23ea5a79b199a007bfad64a866cc2c22e7", "status": "affected", "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "versionType": "git"}, {"lessThan": "eb04e3e9c14ed15914f5fd2eae8b6435f54f095f", "status": "affected", "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "versionType": "git"}, {"lessThan": "6b8a26af065ddc93de2aa5c9f0df98dce9723442", "status": "affected", "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/md/raid10.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.13"}, {"lessThan": "5.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\nmd/raid10: reset read_slot when reusing r10bio for discard\n\nput_all_bios() always drops devs[i].bio, but it only drops\ndevs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an\nr10bio that was previously used for a read, read_slot can still be\nnon-negative, and discard cleanup can skip bio_put() on repl_bio.\n\nReset read_slot to -1 when preparing an r10bio for discard so the\nreplacement bio is always released correctly."}], "id": "CVE-2026-74376", "lastModified": "2026-08-17T06:19:32.373", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:39.373", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3cb2a606ce4902eceabe68338df0653312f861f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/561c9711e4f545d6464a023168bdee03b00fa945"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6b8a26af065ddc93de2aa5c9f0df98dce9723442"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/742e4afd247d9c972695227716b03d432a7e1d26"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b7313f23ea5a79b199a007bfad64a866cc2c22e7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ce3030e92f14362880055de5fe3c258971118853"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eb04e3e9c14ed15914f5fd2eae8b6435f54f095f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: md/raid10: reset read_slot when reusing r10bio for discard", "id": "2516853", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516853"}, "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-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmd/raid10: reset read_slot when reusing r10bio for discard\nput_all_bios() always drops devs[i].bio, but it only drops\ndevs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an\nr10bio that was previously used for a read, read_slot can still be\nnon-negative, and discard cleanup can skip bio_put() on repl_bio.\nReset read_slot to -1 when preparing an r10bio for discard so the\nreplacement bio is always released correctly.", "A flaw was found in the Linux kernel's md/raid10 component. This vulnerability occurs when a specific internal data structure, used for disk operations, is reused for a discard operation without properly resetting a critical flag. This oversight can lead to improper release of system resources, potentially causing system instability or a denial of service (DoS)."], "name": "CVE-2026-74376", "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": "Out of support scope", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74376\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74376\nhttps://lore.kernel.org/linux-cve-announce/2026081504-CVE-2026-74376-e253@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d30588b2731fb01e1616cf16c3fe79a1443e29aa,3cb2a606ce4902eceabe68338df0653312f861f8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d30588b2731fb01e1616cf16c3fe79a1443e29aa,561c9711e4f545d6464a023168bdee03b00fa945)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d30588b2731fb01e1616cf16c3fe79a1443e29aa,ce3030e92f14362880055de5fe3c258971118853)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d30588b2731fb01e1616cf16c3fe79a1443e29aa,742e4afd247d9c972695227716b03d432a7e1d26)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d30588b2731fb01e1616cf16c3fe79a1443e29aa,b7313f23ea5a79b199a007bfad64a866cc2c22e7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d30588b2731fb01e1616cf16c3fe79a1443e29aa,eb04e3e9c14ed15914f5fd2eae8b6435f54f095f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d30588b2731fb01e1616cf16c3fe79a1443e29aa,6b8a26af065ddc93de2aa5c9f0df98dce9723442)"}}], "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": "5.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-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": "2026-08-15T13:30:04.658643+00:00", "updated": "2026-08-22T03:00:12.230671+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}