CVE-2025-39877None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: fix use-after-free in state_show() state_show() reads kdamond->damon_ctx without holding damon_sysfs_lock. This allows a use-after-free race: CPU 0 …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
mm/damon/sysfs: fix use-after-free in state_show()
state_show() reads kdamond->damon_ctx without holding damon_sysfs_lock. This allows a use-after-free race:
CPU 0 CPU 1
state_show() damon_sysfs_turn_damon_on() ctx = kdamond->damon_ctx; mutex_lock(&damon_sysfs_lock); damon_destroy_ctx(kdamond->damon_ctx); kdamond->damon_ctx = NULL; mutex_unlock(&damon_sysfs_lock); damon_is_running(ctx); /* ctx is freed / mutex_lock(&ctx->kdamond_lock); / UAF */
(The race can also occur with damon_sysfs_kdamonds_rm_dirs() and damon_sysfs_kdamond_release(), which free or replace the context under damon_sysfs_lock.)
Fix by taking damon_sysfs_lock before dereferencing the context, mirroring the locking used in pid_show().
The bug has existed since state_show() first accessed kdamond->damon_ctx.
Linux >= a61ea561c87139992fe32afdee48a6f6b85d824a < 3858c44341ad49dc7544b19cc9f9ecffaa7cc50eLinux >= a61ea561c87139992fe32afdee48a6f6b85d824a < 60d7a3d2b985a395318faa1d88da6915fad11c19Linux >= a61ea561c87139992fe32afdee48a6f6b85d824a < 26d29b2ac87a2989071755f9828ebf839b560d4cLinux >= a61ea561c87139992fe32afdee48a6f6b85d824a < 4e87f461d61959647464a94d11ae15c011be58ceLinux >= a61ea561c87139992fe32afdee48a6f6b85d824a < 3260a3f0828e06f5f13fac69fb1999a6d60d9cffLinux 5.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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