{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26632", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.136Z", "datePublished": "2024-03-18T10:07:48.908Z", "dateUpdated": "2026-08-05T11:26:25.799Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:25.799Z" }, "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]" } ], "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 — `ioctl(SG_IO)` on a SCSI/block device fd, or `preadv2`/`pwritev2` with O_DIRECT — 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 — 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" ] } ] } ] } }