netpoll: Fix race condition in netpoll_owner_active
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.10.221, 5.15.162, 6.1.96, 6.6.36, 6.9.7
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
In the Linux kernel, the following vulnerability has been resolved: netpoll: Fix race condition in netpoll_owner_active KCSAN detected a race condition in netpoll: BUG: KCSAN: data-race in net_rx_action / netpoll_send_skb write (marked) to 0xffff8881164168b0 of 4 bytes by interrupt on cpu 10: net_rx_action (./include/linux/netpoll.h:90 net/core/dev.c:6712 net/core/dev.c:6822) <snip> read to 0xffff8881164168b0 of 4 bytes by task 1 on cpu 2: netpoll_send_skb (net/core/netpoll.c:319 net/core/netpoll.c:345 net/core/netpoll.c:393) netpoll_send_udp (net/core/netpoll.c:?) <snip> value changed: 0x0000000a -> 0xffffffff This happens because netpoll_owner_active() needs to check if the current CPU is the owner of the lock, touching napi->poll_owner non atomically. The ->poll_owner field contains the current CPU holding the lock. Use an atomic read to check if the poll owner is the current CPU.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From 89c4b442b78bdba388337cc746fe63caba85f46c · fixed in 43c0ca793a18578a0f5b305dd77fcf7ed99f1265; From 89c4b442b78bdba388337cc746fe63caba85f46c · fixed in efd29cd9c7b8369dfc7bcb34637e6bf1a188aa8e; From 89c4b442b78bdba388337cc746fe63caba85f46c · fixed in 96826b16ef9c6568d31a1f6ceaa266411a46e46c; From 89c4b442b78bdba388337cc746fe63caba85f46c · fixed in 3f1a155950a1685ffd0fd7175b3f671da8771f3d; From 89c4b442b78bdba388337cc746fe63caba85f46c · fixed in a130e7da73ae93afdb4659842267eec734ffbd57; From 89c4b442b78bdba388337cc746fe63caba85f46c · fixed in c2e6a872bde9912f1a7579639c5ca3adf1003916
- Linux Linux
4.10
- KernelLinux
From 4.10.0 · fixed in 5.10.221; From 5.11.0 · fixed in 5.15.162; From 5.16.0 · fixed in 6.1.96; From 6.2.0 · fixed in 6.6.36; From 6.7.0 · fixed in 6.9.7