CVE-2021-47248

Summary

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

udp: fix race between close() and udp_abort()

Kaustubh reported and diagnosed a panic in udp_lib_lookup(). The root cause is udp_abort() racing with close(). Both racing functions acquire the socket lock, but udp{v6}_destroy_sock() release it before performing destructive actions.

We can't easily extend the socket lock scope to avoid the race, instead use the SOCK_DEAD flag to prevent udp_abort from doing any action when the critical race happens.

Diagnosed-and-tested-by: Kaustubh Pandey <kapandey@codeaurora.org>

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5d77dca82839ef016a93ad7acd7058b14d967752 < e3c36c773aed0fef8b1d3d555b43393ec564400faffected
LinuxLinux5d77dca82839ef016a93ad7acd7058b14d967752 < a0882f68f54f7a8b6308261acee9bd4faab5a69eaffected
LinuxLinux5d77dca82839ef016a93ad7acd7058b14d967752 < 2f73448041bd0682d4b552cfd314ace66107f1adaffected
LinuxLinux5d77dca82839ef016a93ad7acd7058b14d967752 < 5a88477c1c85e4baa51e91f2d40f2166235daa56affected
LinuxLinux5d77dca82839ef016a93ad7acd7058b14d967752 < 8729ec8a2238152a4afc212a331a6cd2c61aeeacaffected
LinuxLinux5d77dca82839ef016a93ad7acd7058b14d967752 < 65310b0aff86980a011c7c7bfa487a333d4ca241affected
LinuxLinux5d77dca82839ef016a93ad7acd7058b14d967752 < a8b897c7bcd47f4147d066e22cc01d1026d7640eaffected
LinuxLinux4.9affected
LinuxLinux0 < 4.9unaffected
LinuxLinux4.9.274 <= 4.9.*unaffected
LinuxLinux4.14.238 <= 4.14.*unaffected
LinuxLinux4.19.196 <= 4.19.*unaffected
LinuxLinux5.4.128 <= 5.4.*unaffected
LinuxLinux5.10.46 <= 5.10.*unaffected
LinuxLinux5.12.13 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References