{"id":"CVE-2026-68176","state":"PUBLISHED","title":"tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix mmiotrace possible NULL dereferencing of hiter->dev\n\nIf the mmio_pipe_open() fails to find a PCI device, the hiter->dev\nwill be assigned to NULL. The mmiotrace read() function dereferences the\nhiter->dev if hiter exists.\n\nChange the test of the read to not only check hiter being NULL, but also\nthe hiter->dev before dereferencing it.","publishedAt":"2026-08-10T11:59:47.298Z","updatedAt":"2026-08-19T16:30:41.982Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"c06470320f8156306986a831010cdc9f9f87cb50","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"0d5aaf91a3d05f7f993401af27872a5fc0f26edc","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"3635a9e8b453e658a49b39d025f35bbc6e58d0e2","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"faaf95135184208ee3ac6f33175c8d1800669dfc","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"201a01102c529772168181190cb084471082cf5c","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"8464427e1c177809a9488a97dfa2807d9dcf323b","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"724cd84b0546c07806840fa658714488553d13a2","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"144f29e85702234b23d2a62abf723e6a17eb5427","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_mmiotrace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.27","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.27","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_mmiotrace.c"]}],"references":["https://git.kernel.org/stable/c/c06470320f8156306986a831010cdc9f9f87cb50","https://git.kernel.org/stable/c/0d5aaf91a3d05f7f993401af27872a5fc0f26edc","https://git.kernel.org/stable/c/3635a9e8b453e658a49b39d025f35bbc6e58d0e2","https://git.kernel.org/stable/c/faaf95135184208ee3ac6f33175c8d1800669dfc","https://git.kernel.org/stable/c/201a01102c529772168181190cb084471082cf5c","https://git.kernel.org/stable/c/8464427e1c177809a9488a97dfa2807d9dcf323b","https://git.kernel.org/stable/c/724cd84b0546c07806840fa658714488553d13a2","https://git.kernel.org/stable/c/144f29e85702234b23d2a62abf723e6a17eb5427"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68176.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68176","state":"PUBLISHED","datePublished":"2026-08-10T11:59:47.298Z","dateUpdated":"2026-08-19T16:30:41.982Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.372Z"},"containers":{"cna":{"title":"tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix mmiotrace possible NULL dereferencing of hiter->dev\n\nIf the mmio_pipe_open() fails to find a PCI device, the hiter->dev\nwill be assigned to NULL. The mmiotrace read() function dereferences the\nhiter->dev if hiter exists.\n\nChange the test of the read to not only check hiter being NULL, but also\nthe hiter->dev before dereferencing it."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"c06470320f8156306986a831010cdc9f9f87cb50","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"0d5aaf91a3d05f7f993401af27872a5fc0f26edc","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"3635a9e8b453e658a49b39d025f35bbc6e58d0e2","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"faaf95135184208ee3ac6f33175c8d1800669dfc","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"201a01102c529772168181190cb084471082cf5c","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"8464427e1c177809a9488a97dfa2807d9dcf323b","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"724cd84b0546c07806840fa658714488553d13a2","versionType":"git"},{"version":"f984b51e0779a6dd30feedc41404013ca54e5d05","status":"affected","lessThan":"144f29e85702234b23d2a62abf723e6a17eb5427","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_mmiotrace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.27","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.27","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_mmiotrace.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c06470320f8156306986a831010cdc9f9f87cb50"},{"url":"https://git.kernel.org/stable/c/0d5aaf91a3d05f7f993401af27872a5fc0f26edc"},{"url":"https://git.kernel.org/stable/c/3635a9e8b453e658a49b39d025f35bbc6e58d0e2"},{"url":"https://git.kernel.org/stable/c/faaf95135184208ee3ac6f33175c8d1800669dfc"},{"url":"https://git.kernel.org/stable/c/201a01102c529772168181190cb084471082cf5c"},{"url":"https://git.kernel.org/stable/c/8464427e1c177809a9488a97dfa2807d9dcf323b"},{"url":"https://git.kernel.org/stable/c/724cd84b0546c07806840fa658714488553d13a2"},{"url":"https://git.kernel.org/stable/c/144f29e85702234b23d2a62abf723e6a17eb5427"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:30:41.982Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}