{"id":"CVE-2022-49894","state":"PUBLISHED","title":"cxl/region: Fix region HPA ordering validation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/region: Fix region HPA ordering validation\n\nSome regions may not have any address space allocated. Skip them when\nvalidating HPA order otherwise a crash like the following may result:\n\n devm_cxl_add_region: cxl_acpi cxl_acpi.0: decoder3.4: created region9\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n [..]\n RIP: 0010:store_targetN+0x655/0x1740 [cxl_core]\n [..]\n Call Trace:\n  <TASK>\n  kernfs_fop_write_iter+0x144/0x200\n  vfs_write+0x24a/0x4d0\n  ksys_write+0x69/0xf0\n  do_syscall_64+0x3a/0x90\n\nstore_targetN+0x655/0x1740:\nalloc_region_ref at drivers/cxl/core/region.c:676\n(inlined by) cxl_port_attach_region at drivers/cxl/core/region.c:850\n(inlined by) cxl_region_attach at drivers/cxl/core/region.c:1290\n(inlined by) attach_target at drivers/cxl/core/region.c:1410\n(inlined by) store_targetN at drivers/cxl/core/region.c:1453","publishedAt":"2025-05-01T14:10:37.109Z","updatedAt":"2026-05-11T19:08:48.017Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"384e624bb211b406db40edc900bb51af8bb267d0","status":"affected","lessThan":"12316b9f7c18138ae656050cfd716728e27b7e2f","versionType":"git"},{"version":"384e624bb211b406db40edc900bb51af8bb267d0","status":"affected","lessThan":"a90accb358ae33ea982a35595573f7a045993f8b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cxl/core/region.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.0.8","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cxl/core/region.c"]}],"references":["https://git.kernel.org/stable/c/12316b9f7c18138ae656050cfd716728e27b7e2f","https://git.kernel.org/stable/c/a90accb358ae33ea982a35595573f7a045993f8b"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49894.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49894","state":"PUBLISHED","datePublished":"2025-05-01T14:10:37.109Z","dateUpdated":"2026-05-11T19:08:48.017Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-05-01T14:05:17.243Z"},"containers":{"cna":{"title":"cxl/region: Fix region HPA ordering validation","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/region: Fix region HPA ordering validation\n\nSome regions may not have any address space allocated. Skip them when\nvalidating HPA order otherwise a crash like the following may result:\n\n devm_cxl_add_region: cxl_acpi cxl_acpi.0: decoder3.4: created region9\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n [..]\n RIP: 0010:store_targetN+0x655/0x1740 [cxl_core]\n [..]\n Call Trace:\n  <TASK>\n  kernfs_fop_write_iter+0x144/0x200\n  vfs_write+0x24a/0x4d0\n  ksys_write+0x69/0xf0\n  do_syscall_64+0x3a/0x90\n\nstore_targetN+0x655/0x1740:\nalloc_region_ref at drivers/cxl/core/region.c:676\n(inlined by) cxl_port_attach_region at drivers/cxl/core/region.c:850\n(inlined by) cxl_region_attach at drivers/cxl/core/region.c:1290\n(inlined by) attach_target at drivers/cxl/core/region.c:1410\n(inlined by) store_targetN at drivers/cxl/core/region.c:1453"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"384e624bb211b406db40edc900bb51af8bb267d0","status":"affected","lessThan":"12316b9f7c18138ae656050cfd716728e27b7e2f","versionType":"git"},{"version":"384e624bb211b406db40edc900bb51af8bb267d0","status":"affected","lessThan":"a90accb358ae33ea982a35595573f7a045993f8b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cxl/core/region.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.0.8","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cxl/core/region.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/12316b9f7c18138ae656050cfd716728e27b7e2f"},{"url":"https://git.kernel.org/stable/c/a90accb358ae33ea982a35595573f7a045993f8b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:08:48.017Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.0.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2025-10-01T16:02:18.443986Z","id":"CVE-2022-49894","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","type":"CWE","lang":"en","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T16:02:20.632Z"}}]}}}