CVE-2023-53189
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.
Does this matter?
Lower severity and a low EPSS score (0.16%). Track it; it rarely justifies an emergency change on its own.
Description
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 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.16% probability · 6th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-191
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/06a0716949c22e2aefb648526580671197151accPatch
- https://git.kernel.org/stable/c/1f656e483eb4733d62f18dfb206a49b78f60f495Patch
- https://git.kernel.org/stable/c/2ad31ce40e8182860b631e37209e93e543790b7cPatch
- https://git.kernel.org/stable/c/436b7cc7eae7851c184b671ed7a4a64c750b86f7Patch
- https://git.kernel.org/stable/c/82abd1c37d3bf2a2658b34772c17a25a6f9cca42Patch
- https://git.kernel.org/stable/c/c6395e32935d35e6f935e7caf1c2dac5a95943b4Patch
- https://git.kernel.org/stable/c/c7eeba47058532f6077d6a658e38b6698f6ae71aPatch
- https://git.kernel.org/stable/c/df62fdcd004afa72ecbed0e862ebb983acd3aa57Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.