{"api_version":"1","generated_at":"2026-04-24T08:09:42+00:00","cve":"CVE-2026-31445","urls":{"html":"https://cve.report/CVE-2026-31445","api":"https://cve.report/api/cve/CVE-2026-31445.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31445","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31445"},"summary":{"title":"mm/damon/core: avoid use of half-online-committed context","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: avoid use of half-online-committed context\n\nOne major usage of damon_call() is online DAMON parameters update.  It is\ndone by calling damon_commit_ctx() inside the damon_call() callback\nfunction.  damon_commit_ctx() can fail for two reasons: 1) invalid\nparameters and 2) internal memory allocation failures.  In case of\nfailures, the damon_ctx that attempted to be updated (commit destination)\ncan be partially updated (or, corrupted from a perspective), and therefore\nshouldn't be used anymore.  The function only ensures the damon_ctx object\ncan safely deallocated using damon_destroy_ctx().\n\nThe API callers are, however, calling damon_commit_ctx() only after\nasserting the parameters are valid, to avoid damon_commit_ctx() fails due\nto invalid input parameters.  But it can still theoretically fail if the\ninternal memory allocation fails.  In the case, DAMON may run with the\npartially updated damon_ctx.  This can result in unexpected behaviors\nincluding even NULL pointer dereference in case of damos_commit_dests()\nfailure [1].  Such allocation failure is arguably too small to fail, so\nthe real world impact would be rare.  But, given the bad consequence, this\nneeds to be fixed.\n\nAvoid such partially-committed (maybe-corrupted) damon_ctx use by saving\nthe damon_commit_ctx() failure on the damon_ctx object.  For this,\nintroduce damon_ctx->maybe_corrupted field.  damon_commit_ctx() sets it\nwhen it is failed.  kdamond_call() checks if the field is set after each\ndamon_call_control->fn() is executed.  If it is set, ignore remaining\ncallback requests and return.  All kdamond_call() callers including\nkdamond_fn() also check the maybe_corrupted field right after\nkdamond_call() invocations.  If the field is set, break the kdamond_fn()\nmain loop so that DAMON sill doesn't use the context that might be\ncorrupted.\n\n[sj@kernel.org: let kdamond_call() with cancel regardless of maybe_corrupted]","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-22 14:16:38","updated_at":"2026-04-23 16:17:41"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/26f775a054c3cda86ad465a64141894a90a9e145","name":"https://git.kernel.org/stable/c/26f775a054c3cda86ad465a64141894a90a9e145","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1b247cd0654a3a306996fa80741d79296c683a56","name":"https://git.kernel.org/stable/c/1b247cd0654a3a306996fa80741d79296c683a56","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9c495f9d3781cd692bd199531cabd4627155e8cd","name":"https://git.kernel.org/stable/c/9c495f9d3781cd692bd199531cabd4627155e8cd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31445","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31445","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3301f1861d34f53911a30a8f5f41b9141bd8ed39 9c495f9d3781cd692bd199531cabd4627155e8cd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3301f1861d34f53911a30a8f5f41b9141bd8ed39 1b247cd0654a3a306996fa80741d79296c683a56 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3301f1861d34f53911a30a8f5f41b9141bd8ed39 26f775a054c3cda86ad465a64141894a90a9e145 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.21 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.11 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"31445","cve":"CVE-2026-31445","epss":"0.000170000","percentile":"0.040460000","score_date":"2026-04-23","updated_at":"2026-04-24 00:02:49"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/linux/damon.h","mm/damon/core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9c495f9d3781cd692bd199531cabd4627155e8cd","status":"affected","version":"3301f1861d34f53911a30a8f5f41b9141bd8ed39","versionType":"git"},{"lessThan":"1b247cd0654a3a306996fa80741d79296c683a56","status":"affected","version":"3301f1861d34f53911a30a8f5f41b9141bd8ed39","versionType":"git"},{"lessThan":"26f775a054c3cda86ad465a64141894a90a9e145","status":"affected","version":"3301f1861d34f53911a30a8f5f41b9141bd8ed39","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/linux/damon.h","mm/damon/core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.15"},{"lessThan":"6.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.21","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.21","versionStartIncluding":"6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.11","versionStartIncluding":"6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"6.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: avoid use of half-online-committed context\n\nOne major usage of damon_call() is online DAMON parameters update.  It is\ndone by calling damon_commit_ctx() inside the damon_call() callback\nfunction.  damon_commit_ctx() can fail for two reasons: 1) invalid\nparameters and 2) internal memory allocation failures.  In case of\nfailures, the damon_ctx that attempted to be updated (commit destination)\ncan be partially updated (or, corrupted from a perspective), and therefore\nshouldn't be used anymore.  The function only ensures the damon_ctx object\ncan safely deallocated using damon_destroy_ctx().\n\nThe API callers are, however, calling damon_commit_ctx() only after\nasserting the parameters are valid, to avoid damon_commit_ctx() fails due\nto invalid input parameters.  But it can still theoretically fail if the\ninternal memory allocation fails.  In the case, DAMON may run with the\npartially updated damon_ctx.  This can result in unexpected behaviors\nincluding even NULL pointer dereference in case of damos_commit_dests()\nfailure [1].  Such allocation failure is arguably too small to fail, so\nthe real world impact would be rare.  But, given the bad consequence, this\nneeds to be fixed.\n\nAvoid such partially-committed (maybe-corrupted) damon_ctx use by saving\nthe damon_commit_ctx() failure on the damon_ctx object.  For this,\nintroduce damon_ctx->maybe_corrupted field.  damon_commit_ctx() sets it\nwhen it is failed.  kdamond_call() checks if the field is set after each\ndamon_call_control->fn() is executed.  If it is set, ignore remaining\ncallback requests and return.  All kdamond_call() callers including\nkdamond_fn() also check the maybe_corrupted field right after\nkdamond_call() invocations.  If the field is set, break the kdamond_fn()\nmain loop so that DAMON sill doesn't use the context that might be\ncorrupted.\n\n[sj@kernel.org: let kdamond_call() with cancel regardless of maybe_corrupted]"}],"providerMetadata":{"dateUpdated":"2026-04-22T13:53:42.090Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9c495f9d3781cd692bd199531cabd4627155e8cd"},{"url":"https://git.kernel.org/stable/c/1b247cd0654a3a306996fa80741d79296c683a56"},{"url":"https://git.kernel.org/stable/c/26f775a054c3cda86ad465a64141894a90a9e145"}],"title":"mm/damon/core: avoid use of half-online-committed context","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31445","datePublished":"2026-04-22T13:53:42.090Z","dateReserved":"2026-03-09T15:48:24.090Z","dateUpdated":"2026-04-22T13:53:42.090Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-22 14:16:38","lastModifiedDate":"2026-04-23 16:17:41","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31445","Ordinal":"1","Title":"mm/damon/core: avoid use of half-online-committed context","CVE":"CVE-2026-31445","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31445","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: avoid use of half-online-committed context\n\nOne major usage of damon_call() is online DAMON parameters update.  It is\ndone by calling damon_commit_ctx() inside the damon_call() callback\nfunction.  damon_commit_ctx() can fail for two reasons: 1) invalid\nparameters and 2) internal memory allocation failures.  In case of\nfailures, the damon_ctx that attempted to be updated (commit destination)\ncan be partially updated (or, corrupted from a perspective), and therefore\nshouldn't be used anymore.  The function only ensures the damon_ctx object\ncan safely deallocated using damon_destroy_ctx().\n\nThe API callers are, however, calling damon_commit_ctx() only after\nasserting the parameters are valid, to avoid damon_commit_ctx() fails due\nto invalid input parameters.  But it can still theoretically fail if the\ninternal memory allocation fails.  In the case, DAMON may run with the\npartially updated damon_ctx.  This can result in unexpected behaviors\nincluding even NULL pointer dereference in case of damos_commit_dests()\nfailure [1].  Such allocation failure is arguably too small to fail, so\nthe real world impact would be rare.  But, given the bad consequence, this\nneeds to be fixed.\n\nAvoid such partially-committed (maybe-corrupted) damon_ctx use by saving\nthe damon_commit_ctx() failure on the damon_ctx object.  For this,\nintroduce damon_ctx->maybe_corrupted field.  damon_commit_ctx() sets it\nwhen it is failed.  kdamond_call() checks if the field is set after each\ndamon_call_control->fn() is executed.  If it is set, ignore remaining\ncallback requests and return.  All kdamond_call() callers including\nkdamond_fn() also check the maybe_corrupted field right after\nkdamond_call() invocations.  If the field is set, break the kdamond_fn()\nmain loop so that DAMON sill doesn't use the context that might be\ncorrupted.\n\n[sj@kernel.org: let kdamond_call() with cancel regardless of maybe_corrupted]","Type":"Description","Title":"mm/damon/core: avoid use of half-online-committed context"}]}}}