Vulnerability-Lookup

GHSA-8Q79-FMF3-XH7R

Vulnerability from github – Published: 2025-02-27 21:32 – Updated: 2025-02-27 21:32

Details

In the Linux kernel, the following vulnerability has been resolved:

bfq: Update cgroup information before merging bio

When the process is migrated to a different cgroup (or in case of writeback just starts submitting bios associated with a different cgroup) bfq_merge_bio() can operate with stale cgroup information in bic. Thus the bio can be merged to a request from a different cgroup or it can result in merging of bfqqs for different cgroups or bfqqs of already dead cgroups and causing possible use-after-free issues. Fix the problem by updating cgroup information in bfq_merge_bio().

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49413"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:17Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbfq: Update cgroup information before merging bio\n\nWhen the process is migrated to a different cgroup (or in case of\nwriteback just starts submitting bios associated with a different\ncgroup) bfq_merge_bio() can operate with stale cgroup information in\nbic. Thus the bio can be merged to a request from a different cgroup or\nit can result in merging of bfqqs for different cgroups or bfqqs of\nalready dead cgroups and causing possible use-after-free issues. Fix the\nproblem by updating cgroup information in bfq_merge_bio().",
  "id": "GHSA-8q79-fmf3-xh7r",
  "modified": "2025-02-27T21:32:14Z",
  "published": "2025-02-27T21:32:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49413"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a1077f17169a6059992a0bbdb330e0abad1e6d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b06691af08b41dfd81052a3362514d9827b44bb1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d9165200c5627a2cf4408eefabdf0058bdf95e1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da9f3025d595956410ceaab2bea01980d7775948"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e8821f45612f2e6d9adb9c6ba0fb4184f57692aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea591cd4eb270393810e7be01feb8fde6a34fbbe"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49413 (GCVE-0-2022-49413)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:12 – Updated: 2026-08-05 08:55

Title

bfq: Update cgroup information before merging bio

Summary

In the Linux kernel, the following vulnerability has been resolved: bfq: Update cgroup information before merging bio When the process is migrated to a different cgroup (or in case of writeback just starts submitting bios associated with a different cgroup) bfq_merge_bio() can operate with stale cgroup information in bic. Thus the bio can be merged to a request from a different cgroup or it can result in merging of bfqqs for different cgroups or bfqqs of already dead cgroups and causing possible use-after-free issues. Fix the problem by updating cgroup information in bfq_merge_bio().

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-27 18:16 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/da9f3025d59595641…
https://git.kernel.org/stable/c/b06691af08b41dfd8…
https://git.kernel.org/stable/c/e8821f45612f2e6d9…
https://git.kernel.org/stable/c/d9165200c5627a2cf…
https://git.kernel.org/stable/c/2a1077f17169a6059…
https://git.kernel.org/stable/c/ea591cd4eb2703938…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e21b7a0b988772e82e7147e1c659a5afe2ae003c , < da9f3025d595956410ceaab2bea01980d7775948 (git) Affected: e21b7a0b988772e82e7147e1c659a5afe2ae003c , < b06691af08b41dfd81052a3362514d9827b44bb1 (git) Affected: e21b7a0b988772e82e7147e1c659a5afe2ae003c , < e8821f45612f2e6d9adb9c6ba0fb4184f57692aa (git) Affected: e21b7a0b988772e82e7147e1c659a5afe2ae003c , < d9165200c5627a2cf4408eefabdf0058bdf95e1a (git) Affected: e21b7a0b988772e82e7147e1c659a5afe2ae003c , < 2a1077f17169a6059992a0bbdb330e0abad1e6d9 (git) Affected: e21b7a0b988772e82e7147e1c659a5afe2ae003c , < ea591cd4eb270393810e7be01feb8fde6a34fbbe (git)
Linux	Linux	Affected: 4.12 Unaffected: 0 , < 4.12 (semver) Unaffected: 5.4.198 , ≤ 5.4.* (semver) Unaffected: 5.10.121 , ≤ 5.10.* (semver) Unaffected: 5.15.46 , ≤ 5.15.* (semver) Unaffected: 5.17.14 , ≤ 5.17.* (semver) Unaffected: 5.18.3 , ≤ 5.18.* (semver) Unaffected: 5.19 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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",
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                "role": "CISA Coordinator",
                "timestamp": "2025-02-27T18:16:22.832240Z",
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              "value": "AV:L - The bug is in BFQ\u0027s bio-merge path (bfq_bio_merge), reached only when a local process submits block I/O via write/fsync/etc. through submit_bio \u2192 blk_mq_submit_bio \u2192 blk_mq_sched_bio_merge; it is not reachable from network protocol parsers.\nAC:L - After a cgroup change (or writeback bios for a different cgroup), the bic retains stale cgroup/bfqq state and the next mergeable bio reliably uses it; an attacker who migrates within a delegated cgroup tree and issues I/O controls both sides, so success does not depend on uncontrolled conditions.\nPR:L - Any unprivileged local user can submit I/O into BFQ, and cgroup moves that desync bic state are achievable without real root via delegated cgroup subtrees (containers, systemd user sessions, Android app cgroups).\nUI:N - Exploitation requires only the attacker\u0027s own I/O and cgroup operations; no separate victim action is needed.\nS:U - Impact is confined to the host kernel\u0027s block/cgroup authority (local memory corruption / privilege escalation); it does not cross a VM, IOMMU, or other security boundary.\nC:H - The commit describes merging against bfqqs of already-dead cgroups, i.e. a use-after-free, which per scoring guidance enables attacker-controlled object reuse and arbitrary kernel read primitives.\nI:H - The same UAF on bfqq/bfqg structures enables heap spray and arbitrary write / control-flow hijacking in the kernel, not merely incorrect accounting.\nA:H - Use-after-free on freed BFQ cgroup queue structures can oops/panic the kernel (as shown by related BFQ cgroup UAF KASAN reports in the same fix series)."
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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.

Detection rules are retrieved from Rulezet.

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.

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