{
  "cveId": "CVE-2025-21823",
  "url": "https://patchblox.com/security/cve/CVE-2025-21823",
  "summary": "CVE-2025-21823 is fixed in 61 products on 1 platform, first by DEBIAN-CVE-2025-21823, released February 27, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  batman-adv: Drop unmanaged ELP metric worker  Th...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  batman-adv: Drop unmanaged ELP metric worker  The ELP worker needs to calculate new metric values for all neighbors \u0022reachable\u0022 over an interface. Some of the used metric sources require locks which might need to sleep. This sleep is incompatible with the RCU list iterator used for the recorded neighbors. The initial approach to work around of this problem was to queue another work item per neighbor and then run this in a new context.  Even when this solved the RCU vs might_sleep() conflict, it has a major problems: Nothing was stopping the work item in case it is not needed anymore - for example because one of the related interfaces was removed or the batman-adv module was unloaded - resulting in potential invalid memory accesses.  Directly canceling the metric worker also has various problems:  * cancel_work_sync for a to-be-deactivated interface is called with   rtnl_lock held. But the code in the ELP metric worker also tries to use   rtnl_lock() - which will never return in this case. This also means that   cancel_work_sync would never return because it is waiting for the worker   to finish. * iterating over the neighbor list for the to-be-deactivated interface is   currently done using the RCU specific methods. Which means that it is   possible to miss items when iterating over it without the associated   spinlock - a behaviour which is acceptable for a periodic metric check   but not for a cleanup routine (which must \u0022stop\u0022 all still running   workers)  The better approch is to get rid of the per interface neighbor metric worker and handle everything in the interface worker. The original problems are solved by:  * creating a list of neighbors which require new metric information inside   the RCU protected context, gathering the metric according to the new list   outside the RCU protected context * only use rcu_trylock inside metric gathering code to avoid a deadlock   when the cancel_delayed_work_sync is called in the interface removal code   (which is called with the rtnl_lock held)",
  "published": "2025-02-27T20:16:04Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0024,
  "epssPercentile": 0.15192,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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