Description
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.
Mitigation
Minimal update. May introduce new vulnerabilities or breaking changes.
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 debian 11 | | =5.10.103-1 || =5.10.103-1~bpo10+1 || =5.10.106-1 || =5.10.113-1 || =5.10.120-1 || =5.10.120-1~bpo10+1 || =5.10.127-1 || =5.10.127-2 || =5.10.127-2~bpo10+1 || =5.10.136-1 || =5.10.140-1 || =5.10.148-1 || =5.10.149-1 || =5.10.149-2 || =5.10.158-1 || =5.10.158-2 || =5.10.162-1 || =5.10.178-1 || =5.10.178-2 || =5.10.178-3 || =5.10.179-1 || =5.10.179-2 || =5.10.179-3 || =5.10.179-4 || =5.10.179-5 || =5.10.191-1 || =5.10.197-1 || =5.10.205-1 || =5.10.205-2 || =5.10.209-1 || =5.10.209-2 || =5.10.216-1 || =5.10.218-1 || =5.10.221-1 || =5.10.223-1 || =5.10.226-1 || =5.10.234-1 || =5.10.237-1 || =5.10.244-1 || =5.10.247-1 || =5.10.249-1 || =5.10.251-1 || =5.10.251-3 || =5.10.251-4 || =5.10.251-5 || =5.10.46-4 || =5.10.46-5 || =5.10.70-1 || =5.10.70-1~bpo10+1 || =5.10.84-1 || =5.10.92-1 || =5.10.92-1~bpo10+1 || =5.10.92-2 || >=0 <5.10.257-1 | 5.10.257-1 |
debian 13 | | =6.12.38-1 || =6.12.41-1 || =6.12.43-1 || =6.12.43-1~bpo12+1 || =6.12.48-1 || =6.12.57-1 || =6.12.57-1~bpo12+1 || =6.12.63-1 || =6.12.63-1~bpo12+1 || =6.12.69-1 || =6.12.69-1~bpo12+1 || =6.12.73-1 || =6.12.73-1~bpo12+1 || =6.12.74-1 || =6.12.74-2 || =6.12.74-2~bpo12+1 || =6.12.85-1~bpo12+1 || >=0 <6.12.85-1 | 6.12.85-1 |
debian 14 | | =6.12.38-1 || =6.12.41-1 || =6.12.43-1 || =6.12.43-1~bpo12+1 || =6.12.48-1 || =6.12.57-1 || =6.12.57-1~bpo12+1 || =6.12.63-1 || =6.12.63-1~bpo12+1 || =6.12.69-1 || =6.12.69-1~bpo12+1 || =6.12.73-1 || =6.12.73-1~bpo12+1 || =6.12.74-1 || =6.12.74-2 || =6.12.74-2~bpo12+1 || =6.12.85-1 || =6.12.85-1~bpo12+1 || =6.12.86-1 || =6.12.86-1~bpo12+1 || =6.12.88-1 || =6.12.88-1~bpo12+1 || =6.12.90-1 || =6.12.90-1~bpo12+1 || =6.12.90-2 || =6.13.10-1~exp1 || =6.13.11-1~exp1 || =6.13.2-1~exp1 || =6.13.3-1~exp1 || =6.13.4-1~exp1 || =6.13.5-1~exp1 || =6.13.6-1~exp1 || =6.13.7-1~exp1 || =6.13.8-1~exp1 || =6.13.9-1~exp1 || =6.13~rc6-1~exp1 || =6.13~rc7-1~exp1 || =6.14.3-1~exp1 || =6.14.5-1~exp1 || =6.14.6-1~exp1 || =6.15-1~exp1 || =6.15.1-1~exp1 || =6.15.2-1~exp1 || =6.15.3-1~exp1 || =6.15.4-1~exp1 || =6.15.5-1~exp1 || =6.15.6-1~exp1 || =6.15~rc7-1~exp1 || =6.16-1~exp1 || =6.16.1-1~exp1 || =6.16.10-1 || =6.16.11-1 || =6.16.12-1 || =6.16.12-1~bpo13+1 || =6.16.12-2 || =6.16.3-1 || =6.16.3-1~bpo13+1 || =6.16.5-1 || =6.16.6-1 || =6.16.7-1 || =6.16.8-1 || =6.16.9-1 || =6.16~rc7-1~exp1 || =6.17.10-1 || =6.17.11-1 || =6.17.12-1 || =6.17.13-1 || =6.17.13-1~bpo13+1 || =6.17.2-1~exp1 || =6.17.5-1~exp1 || =6.17.6-1 || =6.17.7-1 || =6.17.7-2 || =6.17.8-1 || =6.17.8-1~bpo13+1 || =6.17.9-1 || =6.18.1-1~exp1 || =6.18.10-1 || =6.18.12-1 || =6.18.12-1~bpo13+1 || =6.18.13-1 || =6.18.14-1 || =6.18.15-1 || =6.18.15-1~bpo13+1 || =6.18.2-1~exp1 || =6.18.3-1 || =6.18.5-1 || =6.18.5-1~bpo13+1 || =6.18.8-1 || =6.18.9-1 || =6.18.9-1~bpo13+1 || =6.18~rc4-1~exp1 || =6.18~rc4-1~exp2 || =6.18~rc5-1~exp1 || =6.18~rc6-1~exp1 || =6.18~rc7-1~exp1 || =6.19-1~exp1 || =6.19.10-1 || =6.19.10-1~bpo13+1 || =6.19.11-1 || =6.19.11-1~bpo13+1 || =6.19.2-1~exp1 || =6.19.3-1~exp1 || =6.19.4-1~exp1 || =6.19.5-1~exp1 || =6.19.6-1 || =6.19.6-2 || =6.19.6-2~bpo13+1 || =6.19.8-1 || =6.19.8-1~bpo13+1 || =6.19~rc4-1~exp1 || =6.19~rc5-1~exp1 || =6.19~rc6-1~exp1 || =6.19~rc7-1~exp1 || =6.19~rc8-1~exp1 || >=0 <6.19.12-1 | 6.19.12-1 |
debian 12 | | =6.1.106-1 || =6.1.106-2 || =6.1.106-3 || =6.1.112-1 || =6.1.115-1 || =6.1.119-1 || =6.1.123-1 || =6.1.124-1 || =6.1.128-1 || =6.1.129-1 || =6.1.133-1 || =6.1.135-1 || =6.1.137-1 || =6.1.139-1 || =6.1.140-1 || =6.1.147-1 || =6.1.148-1 || =6.1.153-1 || =6.1.158-1 || =6.1.159-1 || =6.1.162-1 || =6.1.164-1 || =6.1.27-1 || =6.1.37-1 || =6.1.38-1 || =6.1.38-2 || =6.1.38-2~bpo11+1 || =6.1.38-3 || =6.1.38-4 || =6.1.38-4~bpo11+1 || =6.1.52-1 || =6.1.55-1 || =6.1.55-1~bpo11+1 || =6.1.64-1 || =6.1.66-1 || =6.1.67-1 || =6.1.69-1 || =6.1.69-1~bpo11+1 || =6.1.76-1 || =6.1.76-1~bpo11+1 || =6.1.82-1 || =6.1.85-1 || =6.1.90-1 || =6.1.90-1~bpo11+1 || =6.1.94-1 || =6.1.94-1~bpo11+1 || =6.1.98-1 || =6.1.99-1 || >=0 <6.1.170-1 | 6.1.170-1 |
 rpm rhel10 | | - | - |
rpm rhel7 | | - | - |
rpm rhel8 | | - | - |
rpm rhel9 | | - | - |
rpm rhel8 | | - | - |
rpm rhel9 | | - | - |
