CVE-2022-48874

published 2024-08-21

CVE-2022-48874: In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix use-after-free and race in fastrpc_map_find Currently, there is a race…

Priority P3 38 high 7.8 CVSS 3.1

AV L AC L PR L UI N S U C H I H A H

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

misc: fastrpc: Fix use-after-free and race in fastrpc_map_find

Currently, there is a race window between the point when the mutex is
unlocked in fastrpc_map_lookup and the reference count increasing
(fastrpc_map_get) in fastrpc_map_find, which can also lead to
use-after-free.

So lets merge fastrpc_map_find into fastrpc_map_lookup which allows us
to both protect the maps list by also taking the &fl->lock spinlock and
the reference count, since the spinlock will be released only after.
Add take_ref argument to make this suitable for all callers.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.8-1 (bookworm)	linux 6.1.8-1 (bookworm)
linux	linux	—	—
linux	linux	>= 8f6c1d8c4f0cc316b0456788fff8373554d1d99d < a50c5c25b6e7d2824698c0e6385f882a18f4a498	a50c5c25b6e7d2824698c0e6385f882a18f4a498
linux	linux	>= 8f6c1d8c4f0cc316b0456788fff8373554d1d99d < 9446fa1683a7e3937d9970248ced427c1983a1c5	9446fa1683a7e3937d9970248ced427c1983a1c5
linux	linux_kernel	>= 0 < 6.1.8-1	6.1.8-1
linux	linux_kernel	>= 0 < 6.1.8-1	6.1.8-1
linux	linux_kernel	>= 0 < 6.1.8-1	6.1.8-1
linux	linux_kernel	>= 5.18 < 6.1.8	6.1.8

CVSS provenance

nvd v3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

osv 7.8 HIGH

vendor_debian 7.8 HIGH

vendor_redhat 7.8 HIGH

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