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CVE-2024-35974: block: fix q->blkg_list corruption during disk rebind

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-20 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: block: fix q->blkg_list corruption during disk rebind Multiple gendisk instances can allocated/added for single request queue in case of disk rebind. blkg may still stay in q->blkg_list when calling blkcg_init_disk() for rebind, then q->blkg_list becomes corrupted. Fix the list corruption issue by: - add blkg_init_queue() to initialize q->blkg_list & q->blkcg_mutex only - move calling blkg_init_queue() into blk_alloc_queue() The list corruption should be started since commit f1c006f1c685 ("blk-cgroup: synchronize pd_free_fn() from blkg_free_workfn() and blkcg_deactivate_policy()") which delays removing blkg from q->blkg_list into blkg_free_workfn().

Affected products

• Linux kernel: from 5.18 before 6.6.28; from 6.7 before 6.8.7; 6.9-rc1, 6.9-rc2, 6.9-rc3 — fixed in 6.6.28, 6.8.7

How to fix

Upgrade to a fixed version: Linux kernel 6.6.28, 6.8.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df
• https://git.kernel.org/stable/c/740ffad95ca8033bd6e080ed337655b13b4d38ac
• https://git.kernel.org/stable/c/858c489d81d659af17a4d11cfaad2afb42e47a76
• https://git.kernel.org/stable/c/8b8ace080319a866f5dfe9da8e665ae51d971c54
• https://git.kernel.org/stable/c/b5dae1cd0d8368b4338430ff93403df67f0b8bcc
• https://git.kernel.org/stable/c/740ffad95ca8033bd6e080ed337655b13b4d38ac
• https://git.kernel.org/stable/c/858c489d81d659af17a4d11cfaad2afb42e47a76
• https://git.kernel.org/stable/c/8b8ace080319a866f5dfe9da8e665ae51d971c54

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