ipv6: use RCU iterator to dump route exceptions
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 -> 0x
CVE-2026-93226
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-2026-93226
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": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9",
"lessThan": "dffbfb3117138e8e0e09d05f507bd36ca1f696e5",
"versionType": "git"
},
{
"status": "affected",
"version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9",
"lessThan": "6bd3f94ed858f2d072627546b4cdf712b0f8ea88",
"versionType": "git"
},
{
"status": "affected",
"version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9",
"lessThan": "9c6be625e1a7258e845d6193b3b6b084a00f8e9e",
"versionType": "git"
},
{
"status": "affected",
"version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9",
"lessThan": "3665abc3d2ae8a78cb67f858e848481432ec75db",
"versionType": "git"
},
{
"status": "affected",
"version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9",
"lessThan": "eda56ee17713f9dd834b922f7dbfa2e25fa6358c",
"versionType": "git"
},
{
"status": "affected",
"version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9",
"lessThan": "a602cd128d17a793e12888edc8eda85821ede7e1",
"versionType": "git"
},
{
"status": "affected",
"version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9",
"lessThan": "f6b1b15848fd91fe122dac0d19d3d666e35075b6",
"versionType": "git"
},
{
"status": "affected",
"version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9",
"lessThan": "47cdab0d51aaa9bd85f8e4904585bd5bd4df4488",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/route.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/route.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93226
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37927 · Revision 1
- Added to Heist Feed
- Publisher date