NULL pointer dereference in Linux kernel - CVE-2024-49921

Detailed vulnerability description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the dp_verify_link_cap_with_retries() function in drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c, within the dcn35_init_hw() and dcn35_calc_blocks_to_gate() functions in drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c, within the dcn31_init_hw() function in drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c, within the dcn10_init_hw() function in drivers/gpu/drm/amd/display/dc/hwss/dcn10/dcn10_hwseq.c, within the dce110_edp_backlight_control() function in drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c, within the hubp2_is_flip_pending() function in drivers/gpu/drm/amd/display/dc/hubp/dcn20/dcn20_hubp.c, within the hubp1_is_flip_pending() function in drivers/gpu/drm/amd/display/dc/hubp/dcn10/dcn10_hubp.c, within the dce11_pplib_apply_display_requirements() function in drivers/gpu/drm/amd/display/dc/clk_mgr/dce110/dce110_clk_mgr.c. A local user can perform a denial of service (DoS) attack.

How to mitigate CVE-2024-49921

Sources

• https://git.kernel.org/stable/c/5b35bf1a82eb29841b67ff5643ba83762250fc24
• https://git.kernel.org/stable/c/be1fb44389ca3038ad2430dac4234669bc177ee3
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.11.3
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12