CVE-2024-26632 (GCVE-0-2024-26632)
Vulnerability from cvelistv5 – Published: 2024-03-18 10:07 – Updated: 2026-08-05 11:26
VLAI
EPSS
VEX
Title
block: Fix iterating over an empty bio with bio_for_each_folio_all
Summary
In the Linux kernel, the following vulnerability has been resolved:
block: Fix iterating over an empty bio with bio_for_each_folio_all
If the bio contains no data, bio_first_folio() calls page_folio() on a
NULL pointer and oopses. Move the test that we've reached the end of
the bio from bio_next_folio() to bio_first_folio().
[axboe: add unlikely() to error case]
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-18 15:42 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 , < c6350b5cb78e9024c49eaee6fdb914ad2903a5fe
(git)
Affected: 640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 , < a6bd8182137a12d22d3f2cee463271bdcb491659 (git) Affected: 640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 , < ca3ede3f5893e2d26d4dbdef1eec28a8487fafde (git) Affected: 640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 , < 7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7 (git) |
guessed | |
| Linux | Linux |
Affected:
5.17
Unaffected: 0 , < 5.17 (semver) Unaffected: 6.1.75 , ≤ 6.1.* (semver) Unaffected: 6.6.14 , ≤ 6.6.* (semver) Unaffected: 6.7.2 , ≤ 6.7.* (semver) Unaffected: 6.8 , ≤ * (original_commit_for_fix) |
guessed |
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T19:13:24+00:00",
"cve": "CVE-2024-26632",
"id": "CVE-2024-26632",
"initial_release_date": "2024-03-18T00:00:00+00:00",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: block: Fix iterating over an empty bio with bio_for_each_folio_all",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26632.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-31T00:46:09Z",
"cve": "CVE-2024-26632",
"id": "CVE-2024-26632",
"initial_release_date": "2024-03-19T03:36:32Z",
"product_status:known_affected": "394",
"product_status:known_not_affected": "425",
"product_status:recommended": "353",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2024-26632",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26632.json",
"version": "82"
},
"vulnrichment": {
"containers": {
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"title": "CVE Program Container"
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"metrics": [
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"id": "CVE-2024-26632",
"options": [
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},
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"role": "CISA Coordinator",
"timestamp": "2024-03-18T15:42:33.391380Z",
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"providerMetadata": {
"dateUpdated": "2024-05-23T19:01:18.395Z",
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"shortName": "CISA-ADP"
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"title": "CISA ADP Vulnrichment"
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"product": "Linux",
"programFiles": [
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"status": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "5.17"
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{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.8",
"versionType": "original_commit_for_fix"
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],
"cpeApplicability": [
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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\u0027ve 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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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"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\u0027s 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."
}
]
}
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"cveId": "CVE-2024-26632",
"datePublished": "2024-03-18T10:07:48.908Z",
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"state": "PUBLISHED"
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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