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Bug 829491 (CVE-2021-39685) - Linux Kernel USB Gadget buffer overflow
Summary: Linux Kernel USB Gadget buffer overflow
Alias: CVE-2021-39685
Product: Gentoo Security
Classification: Unclassified
Component: Kernel (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
Depends on: 829458 829459
  Show dependency tree
Reported: 2021-12-17 16:45 UTC by Michał Górny
Modified: 2023-05-01 05:56 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Michał Górny archtester Gentoo Infrastructure gentoo-dev Security 2021-12-17 16:45:13 UTC
Quoting ${URL}:

TLTR; The issue reported to the Linux security team allowed one to read 
and/or write up to 65kB of kernel memory past buffer boundaries by exploiting
lack of limiting of the usb control transfer request wLength in certain
gadget functions.

fixed: 5.15.8, 5.10.85, 5.4.165

Thanks to Sam for noticing and checking affected versions!
Comment 1 John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2021-12-22 20:25:16 UTC
kernel@: please stabilize fixed versions for gentoo-sources.
Comment 2 Mike Pagano gentoo-dev 2022-03-28 15:44:49 UTC
Affected gentoo-sources kernels are removed, newer ones are stabilized
Comment 3 Larry the Git Cow gentoo-dev 2022-04-13 06:00:31 UTC
The bug has been referenced in the following commit(s):

commit 4e7a45f555a91fcf9cd8d0848c6528e280c95ee8
Author:     Sam James <>
AuthorDate: 2022-04-13 06:00:19 +0000
Commit:     Sam James <>
CommitDate: 2022-04-13 06:00:19 +0000

    profiles: drop obsolete 5.14 masks
    Signed-off-by: Sam James <>

 profiles/package.mask | 8 --------
 1 file changed, 8 deletions(-)
Comment 4 Mike Pagano gentoo-dev 2023-04-30 18:41:05 UTC
The two patches that address this CVE are have been in kernels since:

4.4.296 4.9.294 4.14.259 4.19.222 5.4.168 5.10.88 5.15.11 5.16

Feel free to close as this is mitigated by much more recents kernels in the tree.
Comment 5 John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2023-05-01 05:56:46 UTC
Agreed, thanks!