CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
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_flowlabel` reader can therefore race that early `kfree()` and dereference freed option state, triggering a crash in `ip6fl_seq_show()`. Fix this by keeping `fl->opt` alive until `fl_free_rcu()`. That matches the lifetime already required for the enclosing flowlabel while readers can still reach it under RCU.
Засегнати продукти
- Linux Linux: d3aedd5ebd4b0b925b0bcda548066803e1318499 преди 4b6798024f7b2d535f3db1002c760143cdbd1bd3; d3aedd5ebd4b0b925b0bcda548066803e1318499 преди 3c54b66c83fb8fcbde8e6a7bf90b65856e39f827; d3aedd5ebd4b0b925b0bcda548066803e1318499 преди 5a6b15f861b7c1304949e3350d23490a5fe429fd; d3aedd5ebd4b0b925b0bcda548066803e1318499 преди 6c7fbdb8ffde6413640de7cfbd7c976c353e89f8; d3aedd5ebd4b0b925b0bcda548066803e1318499 преди 8027964931785cb73d520ac70a342a3dc16c249b; d3aedd5ebd4b0b925b0bcda548066803e1318499 преди 414726b69921fe6355ae453f5b35e68dd078342a; d3aedd5ebd4b0b925b0bcda548066803e1318499 преди 572ce62778519a7d4d1c15f55dd2e45a474133c4; d3aedd5ebd4b0b925b0bcda548066803e1318499 преди 9ca562bb8e66978b53028fa32b1a190708e6a091
- Linux Linux: 3.9; преди 3.9; 5.10.253 до 5.10.*; 5.15.203 до 5.15.*; 6.1.168 до 6.1.*; 6.6.134 до 6.6.*; 6.12.81 до 6.12.*; 6.18.22 до 6.18.*; 6.19.12 до 6.19.*; 7.0 до *
- Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *
- Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.6 преди *
- Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *
Вид слабост
История
- 25 април 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-31680
- https://nvd.nist.gov/vuln/detail/CVE-2026-31680
- https://git.kernel.org/stable/c/4b6798024f7b2d535f3db1002c760143cdbd1bd3
- https://git.kernel.org/stable/c/3c54b66c83fb8fcbde8e6a7bf90b65856e39f827
- https://git.kernel.org/stable/c/5a6b15f861b7c1304949e3350d23490a5fe429fd
- https://git.kernel.org/stable/c/6c7fbdb8ffde6413640de7cfbd7c976c353e89f8
- https://git.kernel.org/stable/c/8027964931785cb73d520ac70a342a3dc16c249b
- https://git.kernel.org/stable/c/414726b69921fe6355ae453f5b35e68dd078342a
- https://git.kernel.org/stable/c/572ce62778519a7d4d1c15f55dd2e45a474133c4
- https://git.kernel.org/stable/c/9ca562bb8e66978b53028fa32b1a190708e6a091
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html