{"id":"CVE-2023-53189","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6/addrconf: fix a potential refcount underflow for idev\n\nNow in addrconf_mod_rs_timer(), reference idev depends on whether\nrs_timer is not pending","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6/addrconf: fix a potential refcount underflow for idev\n\nNow in addrconf_mod_rs_timer(), reference idev depends on whether\nrs_timer is not pending. Then modify rs_ti…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-191"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 3.10.105, < 4.14.322","linux_kernel >= 4.15, < 4.19.291","linux_kernel >= 4.20, < 5.4.251","linux_kernel >= 5.5, < 5.10.188","linux_kernel >= 5.11, < 5.15.121","linux_kernel >= 5.16, < 6.1.40","linux_kernel >= 6.2, < 6.4.5","linux_kernel = 6.5"],"patched":["linux_kernel 6.4.5"],"published":"2025-09-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:39.233","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-53189","references":[{"url":"https://git.kernel.org/stable/c/06a0716949c22e2aefb648526580671197151acc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1f656e483eb4733d62f18dfb206a49b78f60f495","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2ad31ce40e8182860b631e37209e93e543790b7c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/436b7cc7eae7851c184b671ed7a4a64c750b86f7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/82abd1c37d3bf2a2658b34772c17a25a6f9cca42","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c6395e32935d35e6f935e7caf1c2dac5a95943b4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c7eeba47058532f6077d6a658e38b6698f6ae71a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/df62fdcd004afa72ecbed0e862ebb983acd3aa57","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00168,"epssPercentile":0.06121,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:34:23.338472Z"},"ingestedAt":"2026-10-15T22:48:25.401Z","slug":"CVE-2023-53189","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nipv6/addrconf: fix a potential refcount underflow for idev\n\nNow in addrconf_mod_rs_timer(), reference idev depends on whether\nrs_timer is not pending. Then modify rs_timer timeout.\n\nThere is a time gap in [1], during which if the pending rs_timer\nbecomes not pending. It will miss to hold idev, but the rs_timer\nis activated. Thus rs_timer callback function addrconf_rs_timer()\nwill be executed and put idev later without holding idev. A refcount\nunderflow issue for idev can be caused by this.\n\n\tif (!timer_pending(&idev->rs_timer))\n\t\tin6_dev_hold(idev);\n\t\t  <--------------[1]\n\tmod_timer(&idev->rs_timer, jiffies + when);\n\nTo fix the issue, hold idev if mod_timer() return 0.\n\n## Affected\n\n- `linux_kernel >= 3.10.105, < 4.14.322`\n- `linux_kernel >= 4.15, < 4.19.291`\n- `linux_kernel >= 4.20, < 5.4.251`\n- `linux_kernel >= 5.5, < 5.10.188`\n- `linux_kernel >= 5.11, < 5.15.121`\n- `linux_kernel >= 5.16, < 6.1.40`\n- `linux_kernel >= 6.2, < 6.4.5`\n- `linux_kernel = 6.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.4.5`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}