CVE-2026-93226ipv6: use RCU iterator to dump route exceptions
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU iterator to dump route exceptions rt6_nh_dump_exceptions() uses hlist_for_each_entry() to iterate over RCU-protected exception lists. The caller holds rcu_read_lock(), but does not hold rt6_exception_lock, so rt6_insert_exception() can concurrently add an entry with hlist_add_head_rcu(). KCSAN reports this race (irrelevant details omitted): ================================================================== BUG: KCSAN: data-race in rt6_insert_exception / rt6_nh_dump_exceptions write (marked) to 0xffff8a7c44c59620 of 8 bytes by interrupt on cpu 5: rt6_insert_exception+0x3bb/0x760 __ip6_rt_update_pmtu+0x4fe/0x750 ip6_sk_update_pmtu+0x19a/0x3b0 udpv6_err+0x3ff/0x800 icmpv6_notify+0x1e1/0x440 icmpv6_rcv+0x8c0/0xab0 ip6_protocol_deliver_rcu+0x616/0x840 ip6_input_finish+0xb9/0x160 ... entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff8a7c44c59620 of 8 bytes by task 549 on cpu 14: rt6_nh_dump_exceptions+0xb3/0x260 rt6_dump_route+0x53e/0x5f0 fib6_dump_node+0x6d/0xf0 fib6_walk_continue+0x290/0x2d0 fib6_dump_table+0x28d/0x360 inet6_dump_fib+0x37d/0x620 rtnl_dumpit+0x7b/0xd0 netlink_dump+0x3ae/0x7e0 ... entry_SYSCALL_64_after_hwframe+0x77/0x7f 4 locks held by dumper/549: ... #1: (rcu_read_lock){....}-{1:3}, at: inet6_dump_fib+0x88/0x620 #2: (&tb->tb6_lock){+.-.}-{3:3}, at: fib6_dump_table+0x1e9/0x360 #3: (rcu_read_lock){....}-{1:3}, at: rt6_dump_route+0x483/0x5f0 value changed: 0xffff8a7c44e05700 -> 0xffff8a7c45d60100 Reported by Kernel Concurrency Sanitizer on: CPU: 14 UID: 0 PID: 549 Comm: dumper Not tainted 7.2.0-rc7-virtme #38 PREEMPT(lazy) ... Use hlist_for_each_entry_rcu() to safely iterate over the exception list.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 25 days later
· 25 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9 – < dffbfb3117138e8e0e09d05f507bd36ca1f696e5
- affected 1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9 – < 6bd3f94ed858f2d072627546b4cdf712b0f8ea88
- affected 1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9 – < 9c6be625e1a7258e845d6193b3b6b084a00f8e9e
- affected 1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9 – < 3665abc3d2ae8a78cb67f858e848481432ec75db
- affected 1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9 – < eda56ee17713f9dd834b922f7dbfa2e25fa6358c
- affected 1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9 – < a602cd128d17a793e12888edc8eda85821ede7e1
- affected 1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9 – < f6b1b15848fd91fe122dac0d19d3d666e35075b6
- affected 1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9 – < 47cdab0d51aaa9bd85f8e4904585bd5bd4df4488
- affected 5.3
- unaffected < 5.3
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/dffbfb3117138e8e0e09d05f507bd36ca1f696e5 (opens in a new tab)
- https://git.kernel.org/stable/c/6bd3f94ed858f2d072627546b4cdf712b0f8ea88 (opens in a new tab)
- https://git.kernel.org/stable/c/9c6be625e1a7258e845d6193b3b6b084a00f8e9e (opens in a new tab)
- https://git.kernel.org/stable/c/3665abc3d2ae8a78cb67f858e848481432ec75db (opens in a new tab)
- https://git.kernel.org/stable/c/eda56ee17713f9dd834b922f7dbfa2e25fa6358c (opens in a new tab)
- https://git.kernel.org/stable/c/a602cd128d17a793e12888edc8eda85821ede7e1 (opens in a new tab)
- https://git.kernel.org/stable/c/f6b1b15848fd91fe122dac0d19d3d666e35075b6 (opens in a new tab)
- https://git.kernel.org/stable/c/47cdab0d51aaa9bd85f8e4904585bd5bd4df4488 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86231 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-93226)Record last updated .