CVE-2022-50359

media: cx88: Fix a null-ptr-deref bug in buffer_prepare()

State: Published
Severity: 5.5 Medium
Published: Sep 17, 2025
Updated: May 11, 2026
Reserved: Sep 17, 2025

Description

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

media: cx88: Fix a null-ptr-deref bug in buffer_prepare()

When the driver calls cx88_risc_buffer() to prepare the buffer, the function call may fail, resulting in a empty buffer and null-ptr-deref later in buffer_queue().

The following log can reveal it:

[ 41.822762] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI [ 41.824488] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 41.828027] RIP: 0010:buffer_queue+0xc2/0x500 [ 41.836311] Call Trace: [ 41.836945] __enqueue_in_driver+0x141/0x360 [ 41.837262] vb2_start_streaming+0x62/0x4a0 [ 41.838216] vb2_core_streamon+0x1da/0x2c0 [ 41.838516] __vb2_init_fileio+0x981/0xbc0 [ 41.839141] __vb2_perform_fileio+0xbf9/0x1120 [ 41.840072] vb2_fop_read+0x20e/0x400 [ 41.840346] v4l2_read+0x215/0x290 [ 41.840603] vfs_read+0x162/0x4c0

Fix this by checking the return value of cx88_risc_buffer()

[hverkuil: fix coding style issues]

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c76d04d2079a4b7369ce9a0e859c0f3f2250bcc1Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 10c99d1c46ea9cd940029e17bab11d021f315c21Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4befc7ffa18ef9a4b70d854465313a345a06862fAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9181af2dbf06e7f432e5dbe88d10b22343e851b9Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c2257c8a501537afab276c306cb717b7260276e1Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6f21976095c1e92454ab030976f95f40d652351bAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 704838040f3bdb4aa07ff4f26505a666a3defcfeAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 644d5a87ab1863eb606526ea743021752a17e9cbAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2b064d91440b33fba5b452f2d1b31f13ae911d71Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 4.9.331 through 4.9.Not affected 4.14.296 through 4.14.Not affected 4.19.262 through 4.19.Not affected 5.4.220 through 5.4.Not affected 5.10.150 through 5.10.Not affected 5.15.75 through 5.15.Not affected 5.19.17 through 5.19.Not affected 6.0.3 through 6.0.Not affected 6.1 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c76d04d2079a4b7369ce9a0e859c0f3f2250bcc1Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 10c99d1c46ea9cd940029e17bab11d021f315c21Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4befc7ffa18ef9a4b70d854465313a345a06862fAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9181af2dbf06e7f432e5dbe88d10b22343e851b9Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c2257c8a501537afab276c306cb717b7260276e1Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6f21976095c1e92454ab030976f95f40d652351bAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 704838040f3bdb4aa07ff4f26505a666a3defcfeAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 644d5a87ab1863eb606526ea743021752a17e9cbAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2b064d91440b33fba5b452f2d1b31f13ae911d71Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
4.9.331 through 4.9.*Not affected
4.14.296 through 4.14.*Not affected
4.19.262 through 4.19.*Not affected
5.4.220 through 5.4.*Not affected
5.10.150 through 5.10.*Not affected
5.15.75 through 5.15.*Not affected
5.19.17 through 5.19.*Not affected
6.0.3 through 6.0.*Not affected
6.1 and laterNot affected

References

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