{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39877","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.144Z","datePublished":"2025-09-23T06:00:48.317Z","dateUpdated":"2026-05-11T21:38:09.382Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:38:09.382Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/sysfs: fix use-after-free in state_show()\n\nstate_show() reads kdamond->damon_ctx without holding damon_sysfs_lock. \nThis allows a use-after-free race:\n\nCPU 0                         CPU 1\n-----                         -----\nstate_show()                  damon_sysfs_turn_damon_on()\nctx = kdamond->damon_ctx;     mutex_lock(&damon_sysfs_lock);\n                              damon_destroy_ctx(kdamond->damon_ctx);\n                              kdamond->damon_ctx = NULL;\n                              mutex_unlock(&damon_sysfs_lock);\ndamon_is_running(ctx);        /* ctx is freed */\nmutex_lock(&ctx->kdamond_lock); /* UAF */\n\n(The race can also occur with damon_sysfs_kdamonds_rm_dirs() and\ndamon_sysfs_kdamond_release(), which free or replace the context under\ndamon_sysfs_lock.)\n\nFix by taking damon_sysfs_lock before dereferencing the context, mirroring\nthe locking used in pid_show().\n\nThe bug has existed since state_show() first accessed kdamond->damon_ctx."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/damon/sysfs.c"],"versions":[{"version":"a61ea561c87139992fe32afdee48a6f6b85d824a","lessThan":"3858c44341ad49dc7544b19cc9f9ecffaa7cc50e","status":"affected","versionType":"git"},{"version":"a61ea561c87139992fe32afdee48a6f6b85d824a","lessThan":"60d7a3d2b985a395318faa1d88da6915fad11c19","status":"affected","versionType":"git"},{"version":"a61ea561c87139992fe32afdee48a6f6b85d824a","lessThan":"26d29b2ac87a2989071755f9828ebf839b560d4c","status":"affected","versionType":"git"},{"version":"a61ea561c87139992fe32afdee48a6f6b85d824a","lessThan":"4e87f461d61959647464a94d11ae15c011be58ce","status":"affected","versionType":"git"},{"version":"a61ea561c87139992fe32afdee48a6f6b85d824a","lessThan":"3260a3f0828e06f5f13fac69fb1999a6d60d9cff","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/damon/sysfs.c"],"versions":[{"version":"5.18","status":"affected"},{"version":"0","lessThan":"5.18","status":"unaffected","versionType":"semver"},{"version":"6.1.153","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.107","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.48","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.16.8","lessThanOrEqual":"6.16.*","status":"unaffected","versionType":"semver"},{"version":"6.17","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.1.153"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.6.107"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.12.48"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.16.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.17"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/3858c44341ad49dc7544b19cc9f9ecffaa7cc50e"},{"url":"https://git.kernel.org/stable/c/60d7a3d2b985a395318faa1d88da6915fad11c19"},{"url":"https://git.kernel.org/stable/c/26d29b2ac87a2989071755f9828ebf839b560d4c"},{"url":"https://git.kernel.org/stable/c/4e87f461d61959647464a94d11ae15c011be58ce"},{"url":"https://git.kernel.org/stable/c/3260a3f0828e06f5f13fac69fb1999a6d60d9cff"}],"title":"mm/damon/sysfs: fix use-after-free in state_show()","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T17:44:22.015Z"}}]}}