Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: md: scope memalloc_noio to allocation critical sections Storing a memalloc_noio_save() token in mddev->noio_flags lets one task save the token and another task restore it. With concurrent suspend sysfs writes, task A can enter PF_MEMALLOC_NOIO, return to userspace still in that scope, and later task B can restore A's saved token. Avoid tying the token lifetime to mddev. Keep mddev_suspend() and mddev_resume() only responsible for array suspension, and enter PF_MEMALLOC_NOIO only in the MD paths that allocate memory after the array has been suspended. Restore the token before resuming the array. A reproducer repeatedly writes suspend_lo and suspend_hi from concurrent workers and checks each worker's /proc/self/stat flags before and after the sysfs write.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 78f57ef9d50a75326da73d352d7c27828495229a before 72ebfdf507ede7d7f2b7ca0a5634811a0e4bf045; affected 78f57ef9d50a75326da73d352d7c27828495229a before 28fdea874f68cac6c36651b1fc7272fd2199c48d; affected 78f57ef9d50a75326da73d352d7c27828495229a before a58923756b0f8e71032070c23ae0b167e46731da; affected 78f57ef9d50a75326da73d352d7c27828495229a before bace2010dd7ac07bc980575afb135c406730a7fe |
| Linux / Linux | affected 5.8; unaffected 0 before 5.8; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.