CVE-2024-26632

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Move the test that we've reached the end of\nthe bio from bio_next_folio() to bio_first_folio().\n\n[axboe: add unlikely() to error case]"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Triggered via local syscalls \u2014 `ioctl(SG_IO)` on a SCSI/block device fd, or `preadv2`/`pwritev2` with O_DIRECT \u2014 with no network-facing consumer of `bio_for_each_folio_all()` in the affected paths. No remote peer can reach `bio_first_folio()`.\nAC:L - Fully deterministic and race-free: the attacker just supplies a page-aligned but unmapped buffer so `iov_iter_extract_pages()` returns -EFAULT on the first iteration, leaving `bi_vcnt == 0` on the error path. syzbot produced a reliable C reproducer.\nPR:L - `scsi_cmd_allowed()` grants read-safe SG_IO commands to any user who can open the device (no CAP_SYS_RAWIO), and desktop/kiosk seat ACLs, `disk`/`cdrom` group membership, or container device grants provide that to unprivileged users; the bcachefs `O_DIRECT` path (fs/bcachefs/fs-io-direct.c:142) needs only an ordinary file. Real root in the init namespace is not required.\nUI:N - The attacking process performs the entire sequence itself with a single ioctl or direct-I/O syscall against an already-present device or file. No victim action, mount, or file-open by another user is involved.\nS:U - The uninitialized-bvec dereference and its consequences are confined to the kernel's own security authority on the same host, with no hypervisor, IOMMU, or sandbox boundary crossed.\nC:H - `bio_first_folio()` reads an uninitialized `bio_vec` from recycled mempool memory and `bio_check_pages_dirty()` then branches on `folio_test_dirty()` of that stale pointer, disclosing kernel heap state; the resulting page-refcount corruption is leverageable into arbitrary memory disclosure.\nI:H - `__bio_release_pages()` performs `folio_mark_dirty()` and `unpin_user_page()` on the stale, groomable `bv_page` for `bv_len` bytes, dropping refcounts on pages that were never pinned \u2014 a refcount underflow that yields premature free and a page-level use-after-free write primitive.\nA:H - syzbot reproduced both a NULL pointer dereference in `__bio_release_pages()` and a general protection fault in `bio_first_folio()`; either oopses the kernel and can be re-triggered at will by an unprivileged process."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/bio.h"], "versions": [{"version": "640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662", "lessThan": "c6350b5cb78e9024c49eaee6fdb914ad2903a5fe", "status": "affected", "versionType": "git"}, {"version": "640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662", "lessThan": "a6bd8182137a12d22d3f2cee463271bdcb491659", "status": "affected", "versionType": "git"}, {"version": "640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662", "lessThan": "ca3ede3f5893e2d26d4dbdef1eec28a8487fafde", "status": "affected", "versionType": "git"}, {"version": "640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662", "lessThan": "7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/bio.h"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.75", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.14", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.7.2", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8", "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": "5.17", "versionEndExcluding": "6.1.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c6350b5cb78e9024c49eaee6fdb914ad2903a5fe"}, {"url": "https://git.kernel.org/stable/c/a6bd8182137a12d22d3f2cee463271bdcb491659"}, {"url": "https://git.kernel.org/stable/c/ca3ede3f5893e2d26d4dbdef1eec28a8487fafde"}, {"url": "https://git.kernel.org/stable/c/7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7"}], "title": "block: Fix iterating over an empty bio with bio_for_each_folio_all", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-26632", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-03-18T15:42:33.391380Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:48:29.866Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:07:19.786Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/c6350b5cb78e9024c49eaee6fdb914ad2903a5fe", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/a6bd8182137a12d22d3f2cee463271bdcb491659", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/ca3ede3f5893e2d26d4dbdef1eec28a8487fafde", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7", "tags": ["x_transferred"]}]}]}}

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No remote peer can reach `bio_first_folio()`.\nAC:L - Fully deterministic and race-free: the attacker just supplies a page-aligned but unmapped buffer so `iov_iter_extract_pages()` returns -EFAULT on the first iteration, leaving `bi_vcnt == 0` on the error path. syzbot produced a reliable C reproducer.\nPR:L - `scsi_cmd_allowed()` grants read-safe SG_IO commands to any user who can open the device (no CAP_SYS_RAWIO), and desktop/kiosk seat ACLs, `disk`/`cdrom` group membership, or container device grants provide that to unprivileged users; the bcachefs `O_DIRECT` path (fs/bcachefs/fs-io-direct.c:142) needs only an ordinary file. Real root in the init namespace is not required.\nUI:N - The attacking process performs the entire sequence itself with a single ioctl or direct-I/O syscall against an already-present device or file. No victim action, mount, or file-open by another user is involved.\nS:U - The uninitialized-bvec dereference and its consequences are confined to the kernel's own security authority on the same host, with no hypervisor, IOMMU, or sandbox boundary crossed.\nC:H - `bio_first_folio()` reads an uninitialized `bio_vec` from recycled mempool memory and `bio_check_pages_dirty()` then branches on `folio_test_dirty()` of that stale pointer, disclosing kernel heap state; the resulting page-refcount corruption is leverageable into arbitrary memory disclosure.\nI:H - `__bio_release_pages()` performs `folio_mark_dirty()` and `unpin_user_page()` on the stale, groomable `bv_page` for `bv_len` bytes, dropping refcounts on pages that were never pinned \u2014 a refcount underflow that yields premature free and a page-level use-after-free write primitive.\nA:H - syzbot reproduced both a NULL pointer dereference in `__bio_release_pages()` and a general protection fault in `bio_first_folio()`; either oopses the kernel and can be re-triggered at will by an unprivileged process."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662", "lessThan": "c6350b5cb78e9024c49eaee6fdb914ad2903a5fe", "versionType": "git"}, {"status": "affected", "version": "640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662", "lessThan": "a6bd8182137a12d22d3f2cee463271bdcb491659", "versionType": "git"}, {"status": "affected", "version": "640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662", "lessThan": "ca3ede3f5893e2d26d4dbdef1eec28a8487fafde", "versionType": "git"}, {"status": "affected", "version": "640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662", "lessThan": "7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7", "versionType": "git"}], "programFiles": ["include/linux/bio.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.17"}, {"status": "unaffected", "version": "0", "lessThan": "5.17", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.75", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.14", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.7.2", "versionType": "semver", "lessThanOrEqual": "6.7.*"}, {"status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["include/linux/bio.h"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/c6350b5cb78e9024c49eaee6fdb914ad2903a5fe"}, {"url": "https://git.kernel.org/stable/c/a6bd8182137a12d22d3f2cee463271bdcb491659"}, {"url": "https://git.kernel.org/stable/c/ca3ede3f5893e2d26d4dbdef1eec28a8487fafde"}, {"url": "https://git.kernel.org/stable/c/7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Fix iterating over an empty bio with bio_for_each_folio_all\n\nIf the bio contains no data, bio_first_folio() calls page_folio() on a\nNULL pointer and oopses. Move the test that we've reached the end of\nthe bio from bio_next_folio() to bio_first_folio().\n\n[axboe: add unlikely() to error case]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.75", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.14", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.7.2", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8", "versionStartIncluding": "5.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:25.799Z"}}}, "cveMetadata": {"cveId": "CVE-2024-26632", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:26:25.799Z", "dateReserved": "2024-02-19T14:20:24.136Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-03-18T10:07:48.908Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Move the test that we've reached the end of\nthe bio from bio_next_folio() to bio_first_folio().\n\n[axboe: add unlikely() to error case]"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bloque: corrige la iteraci\u00f3n sobre una biograf\u00eda vac\u00eda con bio_for_each_folio_all Si la biograf\u00eda no contiene datos, bio_first_folio() llama a page_folio() en un puntero NULL y \u00a1vaya! Mueve la prueba de que hemos llegado al final de la biograf\u00eda de bio_next_folio() a bio_first_folio(). [axboe: agregue improbable() al caso de error]"}], "id": "CVE-2024-26632", "lastModified": "2026-08-04T11:16:51.397", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-26632", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-03-18T15:42:33.391380Z", "version": "2.0.3"}}]}, "published": "2024-03-18T11:15:09.697", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a6bd8182137a12d22d3f2cee463271bdcb491659"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6350b5cb78e9024c49eaee6fdb914ad2903a5fe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ca3ede3f5893e2d26d4dbdef1eec28a8487fafde"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a6bd8182137a12d22d3f2cee463271bdcb491659"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6350b5cb78e9024c49eaee6fdb914ad2903a5fe"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ca3ede3f5893e2d26d4dbdef1eec28a8487fafde"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: block: Fix iterating over an empty bio with bio_for_each_folio_all", "id": "2270131", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2270131"}, "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-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nblock: Fix iterating over an empty bio with bio_for_each_folio_all\nIf the bio contains no data, bio_first_folio() calls page_folio() on a\nNULL pointer and oopses. Move the test that we've reached the end of\nthe bio from bio_next_folio() to bio_first_folio().\n[axboe: add unlikely() to error case]", "A vulnerability was found in block subsystem of Linux Kernel causing a system crash when iterating an empty bio using bio_for_each_folio_all() function. This occurred because bio_first_folio() called page_folio() on a NULL pointer."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2024-26632", "package_state": [{"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-03-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26632\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26632\nhttps://lore.kernel.org/linux-cve-announce/20240318100758.2828621-15-lee@kernel.org/T"], "threat_severity": "Moderate"}

{}