CVE-2022-49305
In the Linux kernel, the following vulnerability has been resolved: drivers: staging: rtl8192u: Fix deadlock in ieee80211_beacons_stop() There is a deadlock in ieee80211_beacons_stop(), which is shown below: (Thread 1) | (Thread 2) |…
Does this matter?
Lower severity and a low EPSS score (0.20%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: drivers: staging: rtl8192u: Fix deadlock in ieee80211_beacons_stop() There is a deadlock in ieee80211_beacons_stop(), which is shown below: (Thread 1) | (Thread 2) | ieee80211_send_beacon() ieee80211_beacons_stop() | mod_timer() spin_lock_irqsave() //(1) | (wait a time) ... | ieee80211_send_beacon_cb() del_timer_sync() | spin_lock_irqsave() //(2) (wait timer to stop) | ... We hold ieee->beacon_lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need ieee->beacon_lock in position (2) of thread 2. As a result, ieee80211_beacons_stop() will block forever. This patch extracts del_timer_sync() from the protection of spin_lock_irqsave(), which could let timer handler to obtain the needed lock.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.20% probability · 10th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-667
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/042915c1bfedd684c1d98a841794ee203200571aPatch
- https://git.kernel.org/stable/c/1fbe033c52480f7954c057510040fa6286c4ea25Patch
- https://git.kernel.org/stable/c/66f769762f65d957f688f3258755c6ec410bf710Patch
- https://git.kernel.org/stable/c/806c7b53414934ba2a39449b31fd1a038e500273Patch
- https://git.kernel.org/stable/c/b34cb54923a6e5ddefbaf358c85c922c6ab456e2Patch
- https://git.kernel.org/stable/c/b465bb2ebf666116c1ac745cb80c65154dc0d27ePatch
- https://git.kernel.org/stable/c/ffc9cab7243f8151be37966301307bfd3cda2db3Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.