netfilter: ipset: fix race between dump and ip_set_list resize
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: fix race between dump and ip_set_list resize The release path of ip_set_dump_do() and ip_set_dump_done() read inst->ip_set_list via ip_set_ref_netlink(), a plain rcu_dereference_raw() of the array pointer. These run from netlink_recvmsg() without the nfnl mutex and without an RCU read-side critical section. A concurrent ip_set_create() can grow the array: it publishes the new array, calls synchronize_net() and then kvfree()s the old one. Since the dump paths read the array outside any RCU reader, synchronize_net() does not wait for them and the old array can be freed while they still index into it, causing a use-after-free. The dumped set itself stays pinned via set->ref_netlink, so only the array load needs protecting. Take rcu_read_lock() around it, matching ip_set_get_byname() and __ip_set_put_byindex(). BUG: KASAN: slab-use-after-free in ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697) Read of size 8 at addr ffff88800b5c4018 by task exploit/150 Call Trace: ... kasan_report (mm/kasan/report.c:595) ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697) netlink_dump (net/netlink/af_netlink.c:2325) netlink_recvmsg (net/netlink/af_netlink.c:1976) sock_recvmsg (net/socket.c:1159) __sys_recvfrom (net/socket.c:2315) ... Oops: general protection fault, probably for non-canonical address ... KASAN NOPTI KASAN: maybe wild-memory-access in range [0x02d6...d0-0x02d6...d7] RIP: 0010:ip_set_dum
CVE-2026-64189
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-2026-64189
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": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7",
"lessThan": "a7a299277959683204d73333c32c092fd69327d4",
"versionType": "git"
},
{
"status": "affected",
"version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7",
"lessThan": "1bc67c3fc98e9fc07032cc56afcdbc690c47d11e",
"versionType": "git"
},
{
"status": "affected",
"version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7",
"lessThan": "e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710",
"versionType": "git"
},
{
"status": "affected",
"version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7",
"lessThan": "96fbafc20ebd9a613736c2998b89c539fe3042f5",
"versionType": "git"
},
{
"status": "affected",
"version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7",
"lessThan": "ff86ea9b7fdf70564e60436fbee68c96bc459943",
"versionType": "git"
},
{
"status": "affected",
"version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7",
"lessThan": "81d54c766337b923eec26da0a13406760b091093",
"versionType": "git"
},
{
"status": "affected",
"version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7",
"lessThan": "e8ee198bbc04a32d336e79160fde980e0235b39f",
"versionType": "git"
},
{
"status": "affected",
"version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7",
"lessThan": "7cd9103283b26b917360ec99d7d2f2d761bcf1ab",
"versionType": "git"
},
{
"status": "affected",
"version": "2f6bf7917f55f9dae913193e49672b3598620eab",
"versionType": "git"
},
{
"status": "affected",
"version": "4.19.5",
"lessThan": "4.20",
"versionType": "semver"
}
],
"programFiles": [
"net/netfilter/ipset/ip_set_core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.20"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/ipset/ip_set_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64189
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40971 · Revision 1
- Added to Heist Feed
- Publisher date