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CVE-2023-53189

ipv6/addrconf: fix a potential refcount underflow for idev

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 3.11, 4.14.322, 4.19.291, 5.4.251, 5.10.188, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: ipv6/addrconf: fix a potential refcount underflow for idev Now in addrconf_mod_rs_timer(), reference idev depends on whether rs_timer is not pending. Then modify rs_timer timeout. There is a time gap in [1], during which if the pending rs_timer becomes not pending. It will miss to hold idev, but the rs_timer is activated. Thus rs_timer callback function addrconf_rs_timer() will be executed and put idev later without holding idev. A refcount underflow issue for idev can be caused by this. if (!timer_pending(&idev->rs_timer)) in6_dev_hold(idev); <--------------[1] mod_timer(&idev->rs_timer, jiffies + when); To fix the issue, hold idev if mod_timer() return 0.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From b7b1bfce0bb68bd8f6e62a28295922785cc63781 · fixed in c6395e32935d35e6f935e7caf1c2dac5a95943b4; From b7b1bfce0bb68bd8f6e62a28295922785cc63781 · fixed in df62fdcd004afa72ecbed0e862ebb983acd3aa57; From b7b1bfce0bb68bd8f6e62a28295922785cc63781 · fixed in c7eeba47058532f6077d6a658e38b6698f6ae71a; From b7b1bfce0bb68bd8f6e62a28295922785cc63781 · fixed in 2ad31ce40e8182860b631e37209e93e543790b7c; From b7b1bfce0bb68bd8f6e62a28295922785cc63781 · fixed in 82abd1c37d3bf2a2658b34772c17a25a6f9cca42; From b7b1bfce0bb68bd8f6e62a28295922785cc63781 · fixed in 436b7cc7eae7851c184b671ed7a4a64c750b86f7; From b7b1bfce0bb68bd8f6e62a28295922785cc63781 · fixed in 1f656e483eb4733d62f18dfb206a49b78f60f495; From b7b1bfce0bb68bd8f6e62a28295922785cc63781 · fixed in 06a0716949c22e2aefb648526580671197151acc; From 3.10.105 · fixed in 3.11

  • Linux Linux

    3.11

  • KernelLinux

    From 3.11.0 · fixed in 4.14.322; From 4.15.0 · fixed in 4.19.291; From 4.20.0 · fixed in 5.4.251; From 5.5.0 · fixed in 5.10.188; From 5.11.0 · fixed in 5.15.121; From 5.16.0 · fixed in 6.1.40; From 6.2.0 · fixed in 6.4.5

References 8

git.kernel.org