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Vulnerability Details :

CVE-2025-38620

Summary
Assigner-Linux
Assigner Org ID-416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published At-22 Aug, 2025 | 16:00
Updated At-22 Aug, 2025 | 16:00
Rejected At-
Credits

zloop: fix KASAN use-after-free of tag set

In the Linux kernel, the following vulnerability has been resolved: zloop: fix KASAN use-after-free of tag set When a zoned loop device, or zloop device, is removed, KASAN enabled kernel reports "BUG KASAN use-after-free" in blk_mq_free_tag_set(). The BUG happens because zloop_ctl_remove() calls put_disk(), which invokes zloop_free_disk(). The zloop_free_disk() frees the memory allocated for the zlo pointer. However, after the memory is freed, zloop_ctl_remove() calls blk_mq_free_tag_set(&zlo->tag_set), which accesses the freed zlo. Hence the KASAN use-after-free. zloop_ctl_remove() put_disk(zlo->disk) put_device() kobject_put() ... zloop_free_disk() kvfree(zlo) blk_mq_free_tag_set(&zlo->tag_set) To avoid the BUG, move the call to blk_mq_free_tag_set(&zlo->tag_set) from zloop_ctl_remove() into zloop_free_disk(). This ensures that the tag_set is freed before the call to kvfree(zlo).

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VersionBase scoreBase severityVector
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Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:Linux
Assigner Org ID:416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published At:22 Aug, 2025 | 16:00
Updated At:22 Aug, 2025 | 16:00
Rejected At:
▼CVE Numbering Authority (CNA)
zloop: fix KASAN use-after-free of tag set

In the Linux kernel, the following vulnerability has been resolved: zloop: fix KASAN use-after-free of tag set When a zoned loop device, or zloop device, is removed, KASAN enabled kernel reports "BUG KASAN use-after-free" in blk_mq_free_tag_set(). The BUG happens because zloop_ctl_remove() calls put_disk(), which invokes zloop_free_disk(). The zloop_free_disk() frees the memory allocated for the zlo pointer. However, after the memory is freed, zloop_ctl_remove() calls blk_mq_free_tag_set(&zlo->tag_set), which accesses the freed zlo. Hence the KASAN use-after-free. zloop_ctl_remove() put_disk(zlo->disk) put_device() kobject_put() ... zloop_free_disk() kvfree(zlo) blk_mq_free_tag_set(&zlo->tag_set) To avoid the BUG, move the call to blk_mq_free_tag_set(&zlo->tag_set) from zloop_ctl_remove() into zloop_free_disk(). This ensures that the tag_set is freed before the call to kvfree(zlo).

Affected Products
Vendor
Linux Kernel Organization, IncLinux
Product
Linux
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Program Files
  • drivers/block/zloop.c
Default Status
unaffected
Versions
Affected
  • From eb0570c7df23c2f32fe899fcdaf8fca9a5ecd51e before c7c87046b41a9ef28ee7ac476c369da5b5228bc5 (git)
  • From eb0570c7df23c2f32fe899fcdaf8fca9a5ecd51e before 765761851d89c772f482494d452e266795460278 (git)
Vendor
Linux Kernel Organization, IncLinux
Product
Linux
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Program Files
  • drivers/block/zloop.c
Default Status
affected
Versions
Affected
  • 6.16
Unaffected
  • From 0 before 6.16 (semver)
  • From 6.16.1 through 6.16.* (semver)
  • From 6.17-rc1 through * (original_commit_for_fix)
Metrics
VersionBase scoreBase severityVector
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CAPEC IDDescription
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References
HyperlinkResource
https://git.kernel.org/stable/c/c7c87046b41a9ef28ee7ac476c369da5b5228bc5
N/A
https://git.kernel.org/stable/c/765761851d89c772f482494d452e266795460278
N/A
Hyperlink: https://git.kernel.org/stable/c/c7c87046b41a9ef28ee7ac476c369da5b5228bc5
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/765761851d89c772f482494d452e266795460278
Resource: N/A
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published At:22 Aug, 2025 | 16:15
Updated At:22 Aug, 2025 | 18:08

In the Linux kernel, the following vulnerability has been resolved: zloop: fix KASAN use-after-free of tag set When a zoned loop device, or zloop device, is removed, KASAN enabled kernel reports "BUG KASAN use-after-free" in blk_mq_free_tag_set(). The BUG happens because zloop_ctl_remove() calls put_disk(), which invokes zloop_free_disk(). The zloop_free_disk() frees the memory allocated for the zlo pointer. However, after the memory is freed, zloop_ctl_remove() calls blk_mq_free_tag_set(&zlo->tag_set), which accesses the freed zlo. Hence the KASAN use-after-free. zloop_ctl_remove() put_disk(zlo->disk) put_device() kobject_put() ... zloop_free_disk() kvfree(zlo) blk_mq_free_tag_set(&zlo->tag_set) To avoid the BUG, move the call to blk_mq_free_tag_set(&zlo->tag_set) from zloop_ctl_remove() into zloop_free_disk(). This ensures that the tag_set is freed before the call to kvfree(zlo).

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
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Vendor Statements
References
HyperlinkSourceResource
https://git.kernel.org/stable/c/765761851d89c772f482494d452e266795460278416baaa9-dc9f-4396-8d5f-8c081fb06d67
N/A
https://git.kernel.org/stable/c/c7c87046b41a9ef28ee7ac476c369da5b5228bc5416baaa9-dc9f-4396-8d5f-8c081fb06d67
N/A
Hyperlink: https://git.kernel.org/stable/c/765761851d89c772f482494d452e266795460278
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/c7c87046b41a9ef28ee7ac476c369da5b5228bc5
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource: N/A

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