github - ghsa-6g88-wmq7-m8g5

GHSA-6G88-WMQ7-M8G5

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2025-11-03 18:31

Details

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

block: don't call rq_qos_ops->done_bio if the bio isn't tracked

rq_qos framework is only applied on request based driver, so:

1) rq_qos_done_bio() needn't to be called for bio based driver

2) rq_qos_done_bio() needn't to be called for bio which isn't tracked, such as bios ended from error handling code.

Especially in bio_endio():

1) request queue is referred via bio->bi_bdev->bd_disk->queue, which may be gone since request queue refcount may not be held in above two cases

2) q->rq_qos may be freed in blk_cleanup_queue() when calling into __rq_qos_done_bio()

Fix the potential kernel panic by not calling rq_qos_ops->done_bio if the bio isn't tracked. This way is safe because both ioc_rqos_done_bio() and blkcg_iolatency_done_bio() are nop if the bio isn't tracked.

Severity ?

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47412"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:26Z",
    "severity": "MODERATE"
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  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: don\u0027t call rq_qos_ops-\u003edone_bio if the bio isn\u0027t tracked\n\nrq_qos framework is only applied on request based driver, so:\n\n1) rq_qos_done_bio() needn\u0027t to be called for bio based driver\n\n2) rq_qos_done_bio() needn\u0027t to be called for bio which isn\u0027t tracked,\nsuch as bios ended from error handling code.\n\nEspecially in bio_endio():\n\n1) request queue is referred via bio-\u003ebi_bdev-\u003ebd_disk-\u003equeue, which\nmay be gone since request queue refcount may not be held in above two\ncases\n\n2) q-\u003erq_qos may be freed in blk_cleanup_queue() when calling into\n__rq_qos_done_bio()\n\nFix the potential kernel panic by not calling rq_qos_ops-\u003edone_bio if\nthe bio isn\u0027t tracked. This way is safe because both ioc_rqos_done_bio()\nand blkcg_iolatency_done_bio() are nop if the bio isn\u0027t tracked.",
  "id": "GHSA-6g88-wmq7-m8g5",
  "modified": "2025-11-03T18:31:14Z",
  "published": "2024-05-21T15:31:45Z",
  "references": [
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}

CVE-2021-47412 (GCVE-0-2021-47412)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:04 – Updated: 2025-11-03 17:30

Summary

In the Linux kernel, the following vulnerability has been resolved: block: don't call rq_qos_ops->done_bio if the bio isn't tracked rq_qos framework is only applied on request based driver, so: 1) rq_qos_done_bio() needn't to be called for bio based driver 2) rq_qos_done_bio() needn't to be called for bio which isn't tracked, such as bios ended from error handling code. Especially in bio_endio(): 1) request queue is referred via bio->bi_bdev->bd_disk->queue, which may be gone since request queue refcount may not be held in above two cases 2) q->rq_qos may be freed in blk_cleanup_queue() when calling into __rq_qos_done_bio() Fix the potential kernel panic by not calling rq_qos_ops->done_bio if the bio isn't tracked. This way is safe because both ioc_rqos_done_bio() and blkcg_iolatency_done_bio() are nop if the bio isn't tracked.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/db60edbfff332a6a5…
	https://git.kernel.org/stable/c/004b8f8a691205a93…
	https://git.kernel.org/stable/c/a647a524a46736786…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < db60edbfff332a6a5477c367af8125f034570989 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 004b8f8a691205a93d9e80d98b786b2b97424d6e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a647a524a46736786c95cdb553a070322ca096e3 (git)

Linux

Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.14.11 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-6G88-WMQ7-M8G5

CVE-2021-47412 (GCVE-0-2021-47412)

Tags

Sightings

Nomenclature