Description

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

drm/amd/display: fix null-pointer dereference on edid reading

Use i2c adapter when there isn't aux_mode in dc_link to fix a
null-pointer derefence that happens when running
igt@kms_force_connector_basic in a system with DCN2.1 and HDMI connector
detected as below:

[ +0.178146] BUG: kernel NULL pointer dereference, address: 00000000000004c0
[ +0.000010] #PF: supervisor read access in kernel mode
[ +0.000005] #PF: error_code(0x0000) - not-present page
[ +0.000004] PGD 0 P4D 0
[ +0.000006] Oops: 0000 [#1] PREEMPT SMP NOPTI
[ +0.000006] CPU: 15 PID: 2368 Comm: kms_force_conne Not tainted 6.5.0-asdn+ #152
[ +0.000005] Hardware name: HP HP ENVY x360 Convertible 13-ay1xxx/8929, BIOS F.01 07/14/2021
[ +0.000004] RIP: 0010:i2c_transfer+0xd/0x100
[ +0.000011] Code: ea fc ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 41 54 55 53 <48> 8b 47 10 48 89 fb 48 83 38 00 0f 84 b3 00 00 00 83 3d 2f 80 16
[ +0.000004] RSP: 0018:ffff9c4f89c0fad0 EFLAGS: 00010246
[ +0.000005] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000080
[ +0.000003] RDX: 0000000000000002 RSI: ffff9c4f89c0fb20 RDI: 00000000000004b0
[ +0.000003] RBP: ffff9c4f89c0fb80 R08: 0000000000000080 R09: ffff8d8e0b15b980
[ +0.000003] R10: 00000000000380e0 R11: 0000000000000000 R12: 0000000000000080
[ +0.000002] R13: 0000000000000002 R14: ffff9c4f89c0fb0e R15: ffff9c4f89c0fb0f...

Classification

CVE ID: CVE-2024-26728

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 11.48% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/2d392f7268a1a9bfbd98c831f0f4c964e59aa145
https://git.kernel.org/stable/c/9671761792156f2339627918bafcd713a8a6f777

Timeline