CVE-2026-31680

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown `ip6fl_seq_show()` walks the global flowlabel hash under the seq-file RCU read-side lock and prints `fl->opt->opt_nflen` when an option block is present. Exclusive flowlabels currently free `fl->opt` as soon as `fl->users` drops to zero in `fl_release()`. However, the surrounding `struct ip6_flowlabel` remains visible in the global hash table until later garbage collection removes it and `fl_free_rcu()` finally tears it down. A concurrent `/proc/net/ip6_fl...

Affected product and versions

Product

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

Affected versions

>= d3aedd5ebd4b0b925b0bcda548066803e1318499 < 4b6798024f7b2d535f3db1002c760143cdbd1bd3, >= d3aedd5ebd4b0b925b0bcda548066803e1318499 < 3c54b66c83fb8fcbde8e6a7bf90b65856e39f827, >= d3aedd5ebd4b0b925b0bcda548066803e1318499 < 5a6b15f861b7c1304949e3350d23490a5fe429fd, >= d3aedd5ebd4b0b925b0bcda548066803e1318499 < 6c7fbdb8ffde6413640de7cfbd7c976c353e89f8, >= d3aedd5ebd4b0b925b0bcda548066803e1318499 < 8027964931785cb73d520ac70a342a3dc16c249b, >= d3aedd5ebd4b0b925b0bcda548066803e1318499 < 414726b69921fe6355ae453f5b35e68dd078342a, >= d3aedd5ebd4b0b925b0bcda548066803e1318499 < 572ce62778519a7d4d1c15f55dd2e45a474133c4, >= d3aedd5ebd4b0b925b0bcda548066803e1318499 < 9ca562bb8e66978b53028fa32b1a190708e6a091, >= 3.9, >= V3.1.6, >= V3.1.5, >= 3.9 < 5.10.253, >= 5.11 < 5.15.203, >= 5.16 < 6.1.168, >= 6.2 < 6.6.134, >= 6.7 < 6.12.81, >= 6.13 < 6.18.22, >= 6.19 < 6.19.12, 7.0

Fixed versions

5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12

Technical data

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

Not available