{"id":"CVE-2026-72040","state":"PUBLISHED","title":"ipmi: fix refcount leak in i_ipmi_request()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipmi: fix refcount leak in i_ipmi_request()\n\nWhen a caller provides a `supplied_recv` message to i_ipmi_request(),\nthe function increments the user's `nr_msgs` reference count. If an\nerror occurs later, the out_err cleanup path only frees the recv_msg\nif the function allocated it itself (i.e., !supplied_recv). In the\nsupplied_recv case the cleanup is skipped, leaving the reference count\nelevated. The caller ipmi_request_supply_msgs() does not release the\nsupplied_recv on error, so the reference is permanently leaked.\n\nFix this by explicitly reverting the reference count operations when a\nsupplied recv_msg with a valid user pointer is present in the error\npath: decrement nr_msgs and drop the user's kref.","publishedAt":"2026-08-15T05:51:59.975Z","updatedAt":"2026-08-23T12:46:30.954Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f63723ca7d7623f9dae1990973cd158671f03c56","status":"affected","lessThan":"122ca6b2af714e114c9b872a48372ace31a9ab1f","versionType":"git"},{"version":"348121b29594d42d1635648fd3ed31dfa25351d5","status":"affected","lessThan":"9409e18ffe7378d202efe1cf69989df9f67b0369","versionType":"git"},{"version":"53d6e403affbf6df2c859a0ea00ccfc1e72090ca","status":"affected","lessThan":"e2a3b77df6aef031455dd83ea8ed4344b7dca1f9","versionType":"git"},{"version":"b52da4054ee0bf9ecb44996f2c83236ff50b3812","status":"affected","lessThan":"f5c5065963024390ddad51bd455d1adc710de575","versionType":"git"},{"version":"b52da4054ee0bf9ecb44996f2c83236ff50b3812","status":"affected","lessThan":"0fd23994ec8c5436d9f0b50848deb87ed933e6b3","versionType":"git"},{"version":"b52da4054ee0bf9ecb44996f2c83236ff50b3812","status":"affected","lessThan":"a3f3859cecacb64f18fd446271ece9a3b3f2d4de","versionType":"git"},{"version":"0ed73be9a2547ffb9b5c1d879ad9bfab73d920b5","status":"affected","versionType":"git"},{"version":"6.1.157","status":"affected","lessThan":"6.1.184","versionType":"semver"},{"version":"6.6.113","status":"affected","lessThan":"6.6.148","versionType":"semver"},{"version":"6.12.54","status":"affected","lessThan":"6.12.101","versionType":"semver"},{"version":"6.17.4","status":"affected","lessThan":"6.18","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/ipmi/ipmi_msghandler.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.1.184","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":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","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":["drivers/char/ipmi/ipmi_msghandler.c"]}],"references":["https://git.kernel.org/stable/c/122ca6b2af714e114c9b872a48372ace31a9ab1f","https://git.kernel.org/stable/c/9409e18ffe7378d202efe1cf69989df9f67b0369","https://git.kernel.org/stable/c/e2a3b77df6aef031455dd83ea8ed4344b7dca1f9","https://git.kernel.org/stable/c/f5c5065963024390ddad51bd455d1adc710de575","https://git.kernel.org/stable/c/0fd23994ec8c5436d9f0b50848deb87ed933e6b3","https://git.kernel.org/stable/c/a3f3859cecacb64f18fd446271ece9a3b3f2d4de"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72040.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72040","state":"PUBLISHED","datePublished":"2026-08-15T05:51:59.975Z","dateUpdated":"2026-08-23T12:46:30.954Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.901Z"},"containers":{"cna":{"title":"ipmi: fix refcount leak in i_ipmi_request()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipmi: fix refcount leak in i_ipmi_request()\n\nWhen a caller provides a `supplied_recv` message to i_ipmi_request(),\nthe function increments the user's `nr_msgs` reference count. If an\nerror occurs later, the out_err cleanup path only frees the recv_msg\nif the function allocated it itself (i.e., !supplied_recv). In the\nsupplied_recv case the cleanup is skipped, leaving the reference count\nelevated. The caller ipmi_request_supply_msgs() does not release the\nsupplied_recv on error, so the reference is permanently leaked.\n\nFix this by explicitly reverting the reference count operations when a\nsupplied recv_msg with a valid user pointer is present in the error\npath: decrement nr_msgs and drop the user's kref."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f63723ca7d7623f9dae1990973cd158671f03c56","status":"affected","lessThan":"122ca6b2af714e114c9b872a48372ace31a9ab1f","versionType":"git"},{"version":"348121b29594d42d1635648fd3ed31dfa25351d5","status":"affected","lessThan":"9409e18ffe7378d202efe1cf69989df9f67b0369","versionType":"git"},{"version":"53d6e403affbf6df2c859a0ea00ccfc1e72090ca","status":"affected","lessThan":"e2a3b77df6aef031455dd83ea8ed4344b7dca1f9","versionType":"git"},{"version":"b52da4054ee0bf9ecb44996f2c83236ff50b3812","status":"affected","lessThan":"f5c5065963024390ddad51bd455d1adc710de575","versionType":"git"},{"version":"b52da4054ee0bf9ecb44996f2c83236ff50b3812","status":"affected","lessThan":"0fd23994ec8c5436d9f0b50848deb87ed933e6b3","versionType":"git"},{"version":"b52da4054ee0bf9ecb44996f2c83236ff50b3812","status":"affected","lessThan":"a3f3859cecacb64f18fd446271ece9a3b3f2d4de","versionType":"git"},{"version":"0ed73be9a2547ffb9b5c1d879ad9bfab73d920b5","status":"affected","versionType":"git"},{"version":"6.1.157","status":"affected","lessThan":"6.1.184","versionType":"semver"},{"version":"6.6.113","status":"affected","lessThan":"6.6.148","versionType":"semver"},{"version":"6.12.54","status":"affected","lessThan":"6.12.101","versionType":"semver"},{"version":"6.17.4","status":"affected","lessThan":"6.18","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/ipmi/ipmi_msghandler.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.1.184","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":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","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":["drivers/char/ipmi/ipmi_msghandler.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/122ca6b2af714e114c9b872a48372ace31a9ab1f"},{"url":"https://git.kernel.org/stable/c/9409e18ffe7378d202efe1cf69989df9f67b0369"},{"url":"https://git.kernel.org/stable/c/e2a3b77df6aef031455dd83ea8ed4344b7dca1f9"},{"url":"https://git.kernel.org/stable/c/f5c5065963024390ddad51bd455d1adc710de575"},{"url":"https://git.kernel.org/stable/c/0fd23994ec8c5436d9f0b50848deb87ed933e6b3"},{"url":"https://git.kernel.org/stable/c/a3f3859cecacb64f18fd446271ece9a3b3f2d4de"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-23T12:46:30.954Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.157","versionEndExcluding":"6.1.184"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.113","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.54","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17.4"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}