{"id":"CVE-2022-49218","state":"PUBLISHED","title":"drm/dp: Fix OOB read when handling Post Cursor2 register","description":"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 'drm_dp_get_adjust_request_post_cursor':\ndrivers/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]\n   59 |         return link_status[r - DP_LANE0_1_STATUS];\n      |                ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~\ndrivers/gpu/drm/drm_dp_helper.c:147:51: note: while referencing 'link_status'\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.","publishedAt":"2025-02-26T01:55:51.646Z","updatedAt":"2026-05-11T18:55:26.026Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"79465e0ffeb9e4866939ea562bc55367be91e595","status":"affected","lessThan":"aeaed9a9fe694f8b1462fb81e2d33298c929180b","versionType":"git"},{"version":"79465e0ffeb9e4866939ea562bc55367be91e595","status":"affected","lessThan":"a2151490cc6c57b368d7974ffd447a8b36ade639","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/dp/drm_dp.c","drivers/gpu/drm/tegra/dp.c","include/drm/dp/drm_dp_helper.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.17.2","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/dp/drm_dp.c","drivers/gpu/drm/tegra/dp.c","include/drm/dp/drm_dp_helper.h"]}],"references":["https://git.kernel.org/stable/c/aeaed9a9fe694f8b1462fb81e2d33298c929180b","https://git.kernel.org/stable/c/a2151490cc6c57b368d7974ffd447a8b36ade639"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49218.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49218","state":"PUBLISHED","datePublished":"2025-02-26T01:55:51.646Z","dateUpdated":"2026-05-11T18:55:26.026Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T01:49:39.292Z"},"containers":{"cna":{"title":"drm/dp: Fix OOB read when handling Post Cursor2 register","descriptions":[{"lang":"en","value":"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 'drm_dp_get_adjust_request_post_cursor':\ndrivers/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]\n   59 |         return link_status[r - DP_LANE0_1_STATUS];\n      |                ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~\ndrivers/gpu/drm/drm_dp_helper.c:147:51: note: while referencing 'link_status'\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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"79465e0ffeb9e4866939ea562bc55367be91e595","status":"affected","lessThan":"aeaed9a9fe694f8b1462fb81e2d33298c929180b","versionType":"git"},{"version":"79465e0ffeb9e4866939ea562bc55367be91e595","status":"affected","lessThan":"a2151490cc6c57b368d7974ffd447a8b36ade639","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/dp/drm_dp.c","drivers/gpu/drm/tegra/dp.c","include/drm/dp/drm_dp_helper.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.17.2","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/dp/drm_dp.c","drivers/gpu/drm/tegra/dp.c","include/drm/dp/drm_dp_helper.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/aeaed9a9fe694f8b1462fb81e2d33298c929180b"},{"url":"https://git.kernel.org/stable/c/a2151490cc6c57b368d7974ffd447a8b36ade639"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T18:55:26.026Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.17.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.1,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2022-49218","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:46:31.327734Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","type":"CWE","description":"CWE-125 Out-of-bounds Read"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T19:47:04.533Z"}}]}}}