rds: drop incoming messages that cross network namespace boundaries
In the Linux kernel, the following vulnerability has been resolved: rds: drop incoming messages that cross network namespace boundaries rds_find_bound() looks up the destination socket using a global rhashtable keyed solely on (addr, port, scope_id). Network namespaces are not part of the key, so a sender in netns A can deliver an incoming message (inc) to a socket that lives in a different netns B. When this happens, inc->i_conn points to an rds_connection whose c_net is netns A, but the receiving rs lives in netns B. Once the child process that created netns A exits, cleanup_net() calls rds_loop_exit_net() -> rds_loop_kill_conns() -> rds_conn_destroy(), freeing that connection. If the survivor socket in netns B still holds the inc, any subsequent dereference of inc->i_conn is a use-after-free. There are two dangerous sites in rds_clear_recv_queue(): 1. inc->i_conn->c_lcong (offset 88 of freed rds_connection, size 200) read via rds_recv_rcvbuf_delta() -- confirmed by KASAN. 2. inc->i_conn->c_trans->inc_free(inc) (function pointer at offset 80) called via rds_inc_put() when the inc refcount reaches zero -- same race window, potential call-through-freed-object primitive. The bug is reachable from unprivileged user namespaces (CLONE_NEWUSER + CLONE_NEWNET), available since Linux 3.8. Fix this by rejecting the delivery in rds_recv_incoming() when the socket returned by rds_find_bound() belongs to a different network namespace than the connection that carried the message. Use the
CVE-2026-68335
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-2026-68335
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": "c809195f5523dd4d09403bbb1c9732d548aa0d1e",
"lessThan": "742ff6f02545212e991cd8b45011e40d2c2ef25a",
"versionType": "git"
},
{
"status": "affected",
"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e",
"lessThan": "abff41fd928328bbf3dda1140beb2e61fa424ccd",
"versionType": "git"
},
{
"status": "affected",
"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e",
"lessThan": "03c574112e5d066df0ddce36d7438e850bcf3050",
"versionType": "git"
},
{
"status": "affected",
"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e",
"lessThan": "1e2e2d9806944fe485824d617c8b7c78116c22db",
"versionType": "git"
},
{
"status": "affected",
"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e",
"lessThan": "cfb3ce07b705e486e022a2f2b1242b48f13981ff",
"versionType": "git"
},
{
"status": "affected",
"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e",
"lessThan": "9591042533140dfe6608d9344806d567dcd39d02",
"versionType": "git"
},
{
"status": "affected",
"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e",
"lessThan": "0f8690e3869109cd5803ccb400889d20a0b54e0e",
"versionType": "git"
},
{
"status": "affected",
"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e",
"lessThan": "5521ae71e32a8069ed4ca6e792179dc57bc43ab2",
"versionType": "git"
},
{
"status": "affected",
"version": "c827073c95fde388bc65fe5227f944eaf859b9f0",
"versionType": "git"
},
{
"status": "affected",
"version": "4.17.19",
"lessThan": "4.18",
"versionType": "semver"
}
],
"programFiles": [
"net/rds/recv.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"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/recv.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68335
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41698 · Revision 1
- Added to Heist Feed
- Publisher date