High 7.8Published Sep 15, 2025

CVE-2023-53189ipv6/addrconf: fix a potential refcount underflow for idev

Updated under an hour ago (Oct 27, 2026, 2:30 AM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b7b1bfce0bb68bd8f6e62a28295922785cc63781 before c6395e32935d35e6f935e7caf1c2dac5a95943b4; from b7b1bfce0bb68bd8f6e62a28295922785cc63781 before df62fdcd004afa72ecbed0e862ebb983acd3aa57; from b7b1bfce0bb68bd8f6e62a28295922785cc63781 before c7eeba47058532f6077d6a658e38b6698f6ae71a; from b7b1bfce0bb68bd8f6e62a28295922785cc63781 before 2ad31ce40e8182860b631e37209e93e543790b7c; from b7b1bfce0bb68bd8f6e62a28295922785cc63781 before 82abd1c37d3bf2a2658b34772c17a25a6f9cca42; from b7b1bfce0bb68bd8f6e62a28295922785cc63781 before 436b7cc7eae7851c184b671ed7a4a64c750b86f7; from b7b1bfce0bb68bd8f6e62a28295922785cc63781 before 1f656e483eb4733d62f18dfb206a49b78f60f495; from b7b1bfce0bb68bd8f6e62a28295922785cc63781 before 06a0716949c22e2aefb648526580671197151acc; and 2 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 3.10.105 before 4.14.322; from 4.15 before 4.19.291; from 4.20 before 5.4.251; from 5.5 before 5.10.188; from 5.11 before 5.15.121; from 5.16 before 6.1.40; from 6.2 before 6.4.5; 6.5	NVD

References

References

https://git.kernel.org/stable/c/c6395e32935d35e6f935e7caf1c2dac5a95943b4	patch
https://git.kernel.org/stable/c/df62fdcd004afa72ecbed0e862ebb983acd3aa57	patch
https://git.kernel.org/stable/c/c7eeba47058532f6077d6a658e38b6698f6ae71a	patch
https://git.kernel.org/stable/c/2ad31ce40e8182860b631e37209e93e543790b7c	patch
https://git.kernel.org/stable/c/82abd1c37d3bf2a2658b34772c17a25a6f9cca42	patch
https://git.kernel.org/stable/c/436b7cc7eae7851c184b671ed7a4a64c750b86f7	patch
https://git.kernel.org/stable/c/1f656e483eb4733d62f18dfb206a49b78f60f495	patch
https://git.kernel.org/stable/c/06a0716949c22e2aefb648526580671197151acc	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.