Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a61ea561c87139992fe32afdee48a6f6b85d824a before 3858c44341ad49dc7544b19cc9f9ecffaa7cc50e; affected a61ea561c87139992fe32afdee48a6f6b85d824a before 60d7a3d2b985a395318faa1d88da6915fad11c19; affected a61ea561c87139992fe32afdee48a6f6b85d824a before 26d29b2ac87a2989071755f9828ebf839b560d4c; affected a61ea561c87139992fe32afdee48a6f6b85d824a before 4e87f461d61959647464a94d11ae15c011be58ce; affected a61ea561c87139992fe32afdee48a6f6b85d824a before 3260a3f0828e06f5f13fac69fb1999a6d60d9cff |
| Linux / Linux | affected 5.18; unaffected 0 before 5.18; unaffected 6.1.153 through 6.1.*; unaffected 6.6.107 through 6.6.*; unaffected 6.12.48 through 6.12.*; unaffected 6.16.8 through 6.16.*; unaffected 6.17 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/3858c44341ad49dc7544b19cc9f9ecffaa7cc50e
- https://git.kernel.org/stable/c/60d7a3d2b985a395318faa1d88da6915fad11c19
- https://git.kernel.org/stable/c/26d29b2ac87a2989071755f9828ebf839b560d4c
- https://git.kernel.org/stable/c/4e87f461d61959647464a94d11ae15c011be58ce
- https://git.kernel.org/stable/c/3260a3f0828e06f5f13fac69fb1999a6d60d9cff
ADP enrichment
No English description supplied.