rds: tcp: unregister sysctl before tearing down listen socket
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.
CVE-2026-68290
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-68290
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "de8d6de0ee27be4b2b1e5b06f04aeacbabbba492",
"lessThan": "80fffed08dc1c10e971066941d2daa56253f1552",
"versionType": "git"
},
{
"status": "affected",
"version": "7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c",
"lessThan": "16df2d154ec82e2f7e7585b4fa154751ba37729a",
"versionType": "git"
},
{
"status": "affected",
"version": "7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c",
"lessThan": "3aa13fe0c1bb7bc5312f878e61523e5d8cf3f85d",
"versionType": "git"
},
{
"status": "affected",
"version": "7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c",
"lessThan": "167e54c703ccd4fa028feb568b0d1002020cff86",
"versionType": "git"
},
{
"status": "affected",
"version": "33b3e09a489a31b30342b77cc55290f025d95c7e",
"versionType": "git"
},
{
"status": "affected",
"version": "6.12.10",
"lessThan": "6.12.101",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.160",
"lessThan": "6.7",
"versionType": "semver"
}
],
"programFiles": [
"net/rds/tcp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/rds/tcp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68290
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46457 · Revision 1
- Added to Heist Feed
- Publisher date