248 lines
12 KiB
JSON
248 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-26632",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-19T14:20:24.136Z",
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"datePublished": "2024-03-18T10:07:48.908Z",
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"dateUpdated": "2026-08-05T11:26:25.799Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:26:25.799Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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]"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/linux/bio.h"
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],
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"versions": [
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{
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"version": "640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662",
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"lessThan": "c6350b5cb78e9024c49eaee6fdb914ad2903a5fe",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662",
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"lessThan": "a6bd8182137a12d22d3f2cee463271bdcb491659",
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"status": "affected",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/linux/bio.h"
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],
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"versions": [
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{
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"version": "5.17",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.17",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.75",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.14",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.7.2",
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"lessThanOrEqual": "6.7.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.8",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.17",
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"versionEndExcluding": "6.1.75"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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"url": "https://git.kernel.org/stable/c/c6350b5cb78e9024c49eaee6fdb914ad2903a5fe"
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"url": "https://git.kernel.org/stable/c/a6bd8182137a12d22d3f2cee463271bdcb491659"
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{
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"url": "https://git.kernel.org/stable/c/7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7"
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}
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],
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"title": "block: Fix iterating over an empty bio with bio_for_each_folio_all",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"title": "CISA ADP Vulnrichment",
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"metrics": [
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-26632",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-03-18T15:42:33.391380Z"
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"dateUpdated": "2024-08-02T00:07:19.786Z"
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"title": "CVE Program Container",
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"references": [
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