CVE-2026-64572: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-64572DEBIAN-CVE-2026-64572
Published 05-08-2026Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2026-64572 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.4% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.20%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 33 · Related 31
MGASA-2026-0336MGASA-2026-0337OPENSUSE-SU-2026:11476-1OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1

Timeline

  1. 05-08-2026
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ipv4: fib: free fib_alias with kfree_rcu() on insert error path fib_table_insert() publishes new_fa into the leaf's fa_list with fib_insert_alias() before calling the fib entry notifiers. When a notifier fails, the error path removes new_fa with fib_remove_alias() (hlist_del_rcu) and frees it right away with kmem_cache_free(). fib_table_lookup() walks that list under rcu_read_lock() only, so a concurrent lookup that already reached new_fa keeps reading it after the free: BUG: KASAN: slab-use-after-free in fib_table_lookup (net/ipv4/fib_trie.c:1601) Read of size 1 at addr ffff88810676d4eb by task exploit/297 Call Trace: fib_table_lookup (net/ipv4/fib_trie.c:1601) ip_route_output_key_hash_rcu (net/ipv4/route.c:2814) ip_route_output_key_hash (net/ipv4/route.c:2705) __ip4_datagram_connect (net/ipv4/datagram.c:49) udp_connect (net/ipv4/udp.c:2144) __sys_connect (net/socket.c:2167) __x64_sys_connect (net/socket.c:2173) do_syscall_64 entry_SYSCALL_64_after_hwframe which belongs to the cache ip_fib_alias of size 56 Triggering the error path needs CAP_NET_ADMIN and a registered fib notifier that can reject a route; a netdevsim device whose IPv4 FIB resource is exhausted is enough. Free new_fa with alias_free_mem_rcu(), as fib_table_delete() already does for a fib_alias removed from the trie.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

0.00 pp

From 0.20% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.20%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.101-1 | < 7.1.6-1
  • linux-6.12< 6.12.101-1~deb12u1
Linux1 product
  • linux≥ a6c76c17df021b141b0d306828c9fe4ba2d2717c, < 9d0778571def598c31e84a38ae5a7ebc6f65e6d8 | ≥ a6c76c17df021b141b0d306828c9fe4ba2d2717c, < bb03350f974aec352b660d032a1d283eb462165a | ≥ a6c76c17df021b141b0d306828c9fe4ba2d2717c, < 6429c9cfd941e62acd7bb0bc64d631574d4c3b2a | ≥ a6c76c17df021b141b0d306828c9fe4ba2d2717c, < 8150b5365f026e72250cacc527ea00be30f40105 | ≥ a6c76c17df021b141b0d306828c9fe4ba2d2717c, < d007056868723de9c0cc3f5ffaad47a8d468b9a4 | ≥ a6c76c17df021b141b0d306828c9fe4ba2d2717c, < cb8be318b4432abd88d3172ec157330f27a5f7a7 | ≥ a6c76c17df021b141b0d306828c9fe4ba2d2717c, < b8d2ea75c76abcd0d72679c2f488271f573e32fb | ≥ a6c76c17df021b141b0d306828c9fe4ba2d2717c, < f2f152e94a67bc746afaf05a1b2702c195553112 | 5.6

3 vendors · 160 products

References

27 links
Show all 27 references