CVE-2026-68290rds: tcp: unregister sysctl before tearing down listen socket
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 98% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 6f353c2230c199f343406c08482940ec5d8ba89c – < 66fd678eef1bc2862bde5e7a0f6106256de74f30
- affected de8d6de0ee27be4b2b1e5b06f04aeacbabbba492 – < 80fffed08dc1c10e971066941d2daa56253f1552
- affected 7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c – < 16df2d154ec82e2f7e7585b4fa154751ba37729a
- affected 7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c – < 3aa13fe0c1bb7bc5312f878e61523e5d8cf3f85d
- affected 7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c – < 167e54c703ccd4fa028feb568b0d1002020cff86
- affected 33b3e09a489a31b30342b77cc55290f025d95c7e
- affected 6.12.10 – < 6.12.101
- affected 6.6.160 – < 6.7
- affected 6.13
- unaffected < 6.13
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References5
- https://git.kernel.org/stable/c/66fd678eef1bc2862bde5e7a0f6106256de74f30 (opens in a new tab)
- https://git.kernel.org/stable/c/80fffed08dc1c10e971066941d2daa56253f1552 (opens in a new tab)
- https://git.kernel.org/stable/c/16df2d154ec82e2f7e7585b4fa154751ba37729a (opens in a new tab)
- https://git.kernel.org/stable/c/3aa13fe0c1bb7bc5312f878e61523e5d8cf3f85d (opens in a new tab)
- https://git.kernel.org/stable/c/167e54c703ccd4fa028feb568b0d1002020cff86 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-55391 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-68290)Record last updated .