CVE-2025-39764
In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: remove refcounting in expectation dumpers Same pattern as previous patch: do not keep the expectation object alive via refcount, only store a cookie value and then…
Does this matter?
Lower severity and a low EPSS score (0.17%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: remove refcounting in expectation dumpers Same pattern as previous patch: do not keep the expectation object alive via refcount, only store a cookie value and then use that as the skip hint for dump resumption. AFAICS this has the same issue as the one resolved in the conntrack dumper, when we do if (!refcount_inc_not_zero(&exp->use)) to increment the refcount, there is a chance that exp == last, which causes a double-increment of the refcount and subsequent memory leak.
- 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
- 0.17% probability · 6th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/078d33c95bf534d37aa04269d1ae6158e20082d5
- https://git.kernel.org/stable/c/1492e3dcb2be3aa46d1963da96aa9593e4e4db5aPatch
- https://git.kernel.org/stable/c/64b7684042246e3238464c66894e30ba30c7e851
- https://git.kernel.org/stable/c/9e5021a906532ca16e2aac69c0607711e1c70b1f
- https://git.kernel.org/stable/c/a4d634ded4d3d400f115d84f654f316f249531c9Patch
- https://git.kernel.org/stable/c/b05500444b8eb97644efdd180839a04a706be97c
- https://git.kernel.org/stable/c/bada48ad5b0590e318d0f79636ff62a2ef9f4955
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.