Answer in brief
CVE-2026-64189 records a High severity (CVSS 7.8) vulnerability in netfilter: ipset: fix race between dump and ip_set_list resize. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.20:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.20:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.20:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.20:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.20:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.20:rc6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.20:rc7:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <a7a299277959683204d73333c32c092fd69327d4 || >=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <1bc67c3fc98e9fc07032cc56afcdbc690c47d11e || >=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710 || >=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <96fbafc20ebd9a613736c2998b89c539fe3042f5 || >=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <ff86ea9b7fdf70564e60436fbee68c96bc459943 || >=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <81d54c766337b923eec26da0a13406760b091093 || >=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <e8ee198bbc04a32d336e79160fde980e0235b39f || >=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <7cd9103283b26b917360ec99d7d2f2d761bcf1ab || 2f6bf7917f55f9dae913193e49672b3598620eab || >=4.19.5 <4.20 | a7a299277959683204d73333c32c092fd69327d4, 1bc67c3fc98e9fc07032cc56afcdbc690c47d11e, e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710, 96fbafc20ebd9a613736c2998b89c539fe3042f5, ff86ea9b7fdf70564e60436fbee68c96bc459943, 81d54c766337b923eec26da0a13406760b091093, e8ee198bbc04a32d336e79160fde980e0235b39f, 7cd9103283b26b917360ec99d7d2f2d761bcf1ab, 4.20 |
| Linux/Linuxgeneric | 4.20 | Not reported |
Published upstream
Jul 20, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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_dump_do (net/netfilter/ipset/ip_set_core.c:1698) Kernel panic - not syncing: Fatal exception
Quoted source text, attributed separately from HOL analysis.