{"api_version":"1","generated_at":"2026-08-09T12:13:44+00:00","cve":"CVE-2022-50255","urls":{"html":"https://cve.report/CVE-2022-50255","api":"https://cve.report/api/cve/CVE-2022-50255.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-50255","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-50255"},"summary":{"title":"tracing: Fix reading strings from synthetic events","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix reading strings from synthetic events\n\nThe follow commands caused a crash:\n\n  # cd /sys/kernel/tracing\n  # echo 's:open char file[]' > dynamic_events\n  # echo 'hist:keys=common_pid:file=filename:onchange($file).trace(open,$file)' > events/syscalls/sys_enter_openat/trigger'\n  # echo 1 > events/synthetic/open/enable\n\nBOOM!\n\nThe problem is that the synthetic event field \"char file[]\" will read\nthe value given to it as a string without any memory checks to make sure\nthe address is valid. The above example will pass in the user space\naddress and the sythetic event code will happily call strlen() on it\nand then strscpy() where either one will cause an oops when accessing\nuser space addresses.\n\nUse the helper functions from trace_kprobe and trace_eprobe that can\nread strings safely (and actually succeed when the address is from user\nspace and the memory is mapped in).\n\nNow the above can show:\n\n     packagekitd-1721    [000] ...2.   104.597170: open: file=/usr/lib/rpm/fileattrs/cmake.attr\n    in:imjournal-978     [006] ...2.   104.599642: open: file=/var/lib/rsyslog/imjournal.state.tmp\n     packagekitd-1721    [000] ...2.   104.626308: open: file=/usr/lib/rpm/fileattrs/debuginfo.attr","state":"PUBLISHED","assigner":"Linux","published_at":"2025-09-15 14:15:36","updated_at":"2026-08-04 10:18:09"},"problem_types":["CWE-125"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/0934ae9977c27133449b6dd8c6213970e7eece38","name":"https://git.kernel.org/stable/c/0934ae9977c27133449b6dd8c6213970e7eece38","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d9c79fbcbdb6cb10c07c85040eaf615180b26c48","name":"https://git.kernel.org/stable/c/d9c79fbcbdb6cb10c07c85040eaf615180b26c48","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f8bae1853196b52ede50950387f5b48cf83b9815","name":"https://git.kernel.org/stable/c/f8bae1853196b52ede50950387f5b48cf83b9815","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/149198d0b884e4606ed1d29b330c70016d878276","name":"https://git.kernel.org/stable/c/149198d0b884e4606ed1d29b330c70016d878276","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-50255","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50255","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd82631d7ccdc894af2738e47abcba2cb6e7dea9 d9c79fbcbdb6cb10c07c85040eaf615180b26c48 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd82631d7ccdc894af2738e47abcba2cb6e7dea9 149198d0b884e4606ed1d29b330c70016d878276 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd82631d7ccdc894af2738e47abcba2cb6e7dea9 f8bae1853196b52ede50950387f5b48cf83b9815 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd82631d7ccdc894af2738e47abcba2cb6e7dea9 0934ae9977c27133449b6dd8c6213970e7eece38 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix reading strings from synthetic events\n\nThe follow commands caused a crash:\n\n  # cd /sys/kernel/tracing\n  # echo 's:open char file[]' > dynamic_events\n  # echo 'hist:keys=common_pid:file=filename:onchange($file).trace(open,$file)' > events/syscalls/sys_enter_openat/trigger'\n  # echo 1 > events/synthetic/open/enable\n\nBOOM!\n\nThe problem is that the synthetic event field \"char file[]\" will read\nthe value given to it as a string without any memory checks to make sure\nthe address is valid. The above example will pass in the user space\naddress and the sythetic event code will happily call strlen() on it\nand then strscpy() where either one will cause an oops when accessing\nuser space addresses.\n\nUse the helper functions from trace_kprobe and trace_eprobe that can\nread strings safely (and actually succeed when the address is from user\nspace and the memory is mapped in).\n\nNow the above can show:\n\n     packagekitd-1721    [000] ...2.   104.597170: open: file=/usr/lib/rpm/fileattrs/cmake.attr\n    in:imjournal-978     [006] ...2.   104.599642: open: file=/var/lib/rsyslog/imjournal.state.tmp\n     packagekitd-1721    [000] ...2.   104.626308: open: file=/usr/lib/rpm/fileattrs/debuginfo.attr"}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:08:15.514Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/d9c79fbcbdb6cb10c07c85040eaf615180b26c48"},{"url":"https://git.kernel.org/stable/c/149198d0b884e4606ed1d29b330c70016d878276"},{"url":"https://git.kernel.org/stable/c/f8bae1853196b52ede50950387f5b48cf83b9815"},{"url":"https://git.kernel.org/stable/c/0934ae9977c27133449b6dd8c6213970e7eece38"}],"title":"tracing: Fix reading strings from synthetic events","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2022-50255","datePublished":"2025-09-15T14:02:37.224Z","dateReserved":"2025-09-15T13:58:00.973Z","dateUpdated":"2026-08-04T09:08:15.514Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-09-15 14:15:36","lastModifiedDate":"2026-08-04 10:18:09","problem_types":["CWE-125"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.2}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.15.75","matchCriteriaId":"31A04601-B8E8-4F81-8415-9142CA0221FA"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"5.19.17","matchCriteriaId":"19B4C3A4-E5C3-41DC-BB14-BE72858E7D35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.0.3","matchCriteriaId":"5BCD8201-B847-4442-B894-70D430128DEF"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2022","CveId":"50255","Ordinal":"1","Title":"tracing: Fix reading strings from synthetic events","CVE":"CVE-2022-50255","Year":"2022"},"notes":[{"CveYear":"2022","CveId":"50255","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix reading strings from synthetic events\n\nThe follow commands caused a crash:\n\n  # cd /sys/kernel/tracing\n  # echo 's:open char file[]' > dynamic_events\n  # echo 'hist:keys=common_pid:file=filename:onchange($file).trace(open,$file)' > events/syscalls/sys_enter_openat/trigger'\n  # echo 1 > events/synthetic/open/enable\n\nBOOM!\n\nThe problem is that the synthetic event field \"char file[]\" will read\nthe value given to it as a string without any memory checks to make sure\nthe address is valid. The above example will pass in the user space\naddress and the sythetic event code will happily call strlen() on it\nand then strscpy() where either one will cause an oops when accessing\nuser space addresses.\n\nUse the helper functions from trace_kprobe and trace_eprobe that can\nread strings safely (and actually succeed when the address is from user\nspace and the memory is mapped in).\n\nNow the above can show:\n\n     packagekitd-1721    [000] ...2.   104.597170: open: file=/usr/lib/rpm/fileattrs/cmake.attr\n    in:imjournal-978     [006] ...2.   104.599642: open: file=/var/lib/rsyslog/imjournal.state.tmp\n     packagekitd-1721    [000] ...2.   104.626308: open: file=/usr/lib/rpm/fileattrs/debuginfo.attr","Type":"Description","Title":"tracing: Fix reading strings from synthetic events"}]}}}