GHSA-5876-WPJ2-HW48
Vulnerability from github – Published: 2025-03-18 21:32 – Updated: 2025-03-18 21:32In the Linux kernel, the following vulnerability has been resolved:
drm/dp: Fix OOB read when handling Post Cursor2 register
The link_status array was not large enough to read the Adjust Request Post Cursor2 register, so remove the common helper function to avoid an OOB read, found with a -Warray-bounds build:
drivers/gpu/drm/drm_dp_helper.c: In function 'drm_dp_get_adjust_request_post_cursor': drivers/gpu/drm/drm_dp_helper.c:59:27: error: array subscript 10 is outside array bounds of 'const u8[6]' {aka 'const unsigned char[6]'} [-Werror=array-bounds] 59 | return link_status[r - DP_LANE0_1_STATUS]; | ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/drm_dp_helper.c:147:51: note: while referencing 'link_status' 147 | u8 drm_dp_get_adjust_request_post_cursor(const u8 link_status[DP_LINK_STATUS_SIZE], | ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Replace the only user of the helper with an open-coded fetch and decode, similar to drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c.
{
"affected": [],
"aliases": [
"CVE-2022-49218"
],
"database_specific": {
"cwe_ids": [
"CWE-125"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-26T07:00:58Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/dp: Fix OOB read when handling Post Cursor2 register\n\nThe link_status array was not large enough to read the Adjust Request\nPost Cursor2 register, so remove the common helper function to avoid\nan OOB read, found with a -Warray-bounds build:\n\ndrivers/gpu/drm/drm_dp_helper.c: In function \u0027drm_dp_get_adjust_request_post_cursor\u0027:\ndrivers/gpu/drm/drm_dp_helper.c:59:27: error: array subscript 10 is outside array bounds of \u0027const u8[6]\u0027 {aka \u0027const unsigned char[6]\u0027} [-Werror=array-bounds]\n 59 | return link_status[r - DP_LANE0_1_STATUS];\n | ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~\ndrivers/gpu/drm/drm_dp_helper.c:147:51: note: while referencing \u0027link_status\u0027\n 147 | u8 drm_dp_get_adjust_request_post_cursor(const u8 link_status[DP_LINK_STATUS_SIZE],\n | ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nReplace the only user of the helper with an open-coded fetch and decode,\nsimilar to drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c.",
"id": "GHSA-5876-wpj2-hw48",
"modified": "2025-03-18T21:32:00Z",
"published": "2025-03-18T21:32:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49218"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a2151490cc6c57b368d7974ffd447a8b36ade639"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aeaed9a9fe694f8b1462fb81e2d33298c929180b"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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