CVE-2026-68290
- Source
- https://cve.org/CVERecord?id=CVE-2026-68290
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68290.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-68290
- Downstream
- Published
- 2026-08-10T12:02:23Z
- Modified
- 2026-08-18T03:30:51Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- rds: tcp: unregister sysctl before tearing down listen socket
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
rds: tcp: unregister sysctl before tearing down listen socket
rds_tcp_exit_net() frees the per-netns RDS TCP listen socket via rds_tcp_kill_sock() before unregistering the per-netns sysctl table. Since rds_tcp_skbuf_handler() derives the netns from rtn->rds_tcp_listen_sock->sk, a concurrent sysctl write can race with netns teardown and dereference the freed socket/sk.
KASAN reports the race as:
BUG: KASAN: slab-use-after-free in rds_tcp_skbuf_handler+0x2aa/0x2e0 rds_tcp_skbuf_handler net/rds/tcp.c:721 proc_sys_call_handler fs/proc/proc_sysctl.c vfs_write fs/read_write.c __x64_sys_pwrite64 fs/read_write.c
Fix this by unregistering the RDS TCP sysctl table before calling rds_tcp_kill_sock(). unregister_net_sysctl_table() prevents new sysctl handlers from starting and waits for in-flight handlers to finish, so the listen socket can then be released safely. The fix was tested against the linked reproducer.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68290.json" }- References
-
- https://git.kernel.org/stable/c/167e54c703ccd4fa028feb568b0d1002020cff86
- https://git.kernel.org/stable/c/16df2d154ec82e2f7e7585b4fa154751ba37729a
- https://git.kernel.org/stable/c/3aa13fe0c1bb7bc5312f878e61523e5d8cf3f85d
- https://git.kernel.org/stable/c/80fffed08dc1c10e971066941d2daa56253f1552
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68290.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-68290
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedde8d6de0ee27be4b2b1e5b06f04aeacbabbba492Fixed80fffed08dc1c10e971066941d2daa56253f1552
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7f5611cbc4871c7fb1ad36c2e5a9edad63dca95cFixed16df2d154ec82e2f7e7585b4fa154751ba37729aFixed3aa13fe0c1bb7bc5312f878e61523e5d8cf3f85dFixed167e54c703ccd4fa028feb568b0d1002020cff86
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.12.10Fixed6.12.101