In the Linux kernel, the following vulnerability has been resolved:

bridge: cfm: reject invalid CCM interval at configuration time

ccm_tx_work_expired() re-arms itself via queue_delayed_work() using
the configured exp_interval converted by interval_to_us(). When
exp_interval is BR_CFM_CCM_INTERVAL_NONE or out of range,
interval_to_us() returns 0, causing the worker to fire immediately in
a tight loop that allocates skbs until OOM.

Fix this by validating exp_interval at configuration time:

 - Constrain IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL to the valid range
   [BR_CFM_CCM_INTERVAL_3_3_MS, BR_CFM_CCM_INTERVAL_10_MIN] in the
   netlink policy so userspace cannot set an invalid value.

 - Reject starting CCM TX in br_cfm_cc_ccm_tx() when exp_interval has
   not yet been configured (defaults to 0 from kzalloc).

https://git.kernel.org/stable/c/2870056a78961e0fecd652362ee9d3fcfd24a8a6

https://git.kernel.org/stable/c/53788b134519e995699ea3721969c96a08d64575

https://git.kernel.org/stable/c/865643640b5b5c4579b32d7a55ac9ad648362eaa

https://git.kernel.org/stable/c/a090880c1f544589427e5b7050c40fb211ccecb4

https://git.kernel.org/stable/c/b42aeb58317f12024734759ff745856b53948873

https://git.kernel.org/stable/c/f0f5eb59a97ece0d85de8cfa95dc18c609302a8b

https://git.kernel.org/stable/c/f3e02edd8322b31b8e6517faa6ba053bf29d1e26

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