Vulnerability Details CVE-2022-50221
In the Linux kernel, the following vulnerability has been resolved:
drm/fb-helper: Fix out-of-bounds access
Clip memory range to screen-buffer size to avoid out-of-bounds access
in fbdev deferred I/O's damage handling.
Fbdev's deferred I/O can only track pages. From the range of pages, the
damage handler computes the clipping rectangle for the display update.
If the fbdev screen buffer ends near the beginning of a page, that page
could contain more scanlines. The damage handler would then track these
non-existing scanlines as dirty and provoke an out-of-bounds access
during the screen update. Hence, clip the maximum memory range to the
size of the screen buffer.
While at it, rename the variables min/max to min_off/max_off in
drm_fb_helper_deferred_io(). This avoids confusion with the macros of
the same name.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 4.6%
CVSS Severity
CVSS v3 Score 7.1
References
Products affected by CVE-2022-50221
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cpe:2.3:o:linux:linux_kernel:5.18
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cpe:2.3:o:linux:linux_kernel:5.18.1
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cpe:2.3:o:linux:linux_kernel:5.18.10
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cpe:2.3:o:linux:linux_kernel:5.18.11
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cpe:2.3:o:linux:linux_kernel:5.18.12
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cpe:2.3:o:linux:linux_kernel:5.18.13
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cpe:2.3:o:linux:linux_kernel:5.18.14
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cpe:2.3:o:linux:linux_kernel:5.18.15
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cpe:2.3:o:linux:linux_kernel:5.18.16
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cpe:2.3:o:linux:linux_kernel:5.18.17
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cpe:2.3:o:linux:linux_kernel:5.18.18
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cpe:2.3:o:linux:linux_kernel:5.18.19
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cpe:2.3:o:linux:linux_kernel:5.18.2
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cpe:2.3:o:linux:linux_kernel:5.18.3
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cpe:2.3:o:linux:linux_kernel:5.18.4
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cpe:2.3:o:linux:linux_kernel:5.18.5
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cpe:2.3:o:linux:linux_kernel:5.18.6
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cpe:2.3:o:linux:linux_kernel:5.18.7
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cpe:2.3:o:linux:linux_kernel:5.18.8
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cpe:2.3:o:linux:linux_kernel:5.18.9
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cpe:2.3:o:linux:linux_kernel:5.19
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cpe:2.3:o:linux:linux_kernel:5.19.1