270 lines
13 KiB
JSON
270 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47546",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-24T15:02:54.829Z",
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"datePublished": "2024-05-24T15:09:51.286Z",
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"dateUpdated": "2026-05-23T15:20:10.607Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-05-23T15:20:10.607Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix memory leak in fib6_rule_suppress\n\nThe kernel leaks memory when a `fib` rule is present in IPv6 nftables\nfirewall rules and a suppress_prefix rule is present in the IPv6 routing\nrules (used by certain tools such as wg-quick). In such scenarios, every\nincoming packet will leak an allocation in `ip6_dst_cache` slab cache.\n\nAfter some hours of `bpftrace`-ing and source code reading, I tracked\ndown the issue to ca7a03c41753 (\"ipv6: do not free rt if\nFIB_LOOKUP_NOREF is set on suppress rule\").\n\nThe problem with that change is that the generic `args->flags` always have\n`FIB_LOOKUP_NOREF` set[1][2] but the IPv6-specific flag\n`RT6_LOOKUP_F_DST_NOREF` might not be, leading to `fib6_rule_suppress` not\ndecreasing the refcount when needed.\n\nHow to reproduce:\n - Add the following nftables rule to a prerouting chain:\n meta nfproto ipv6 fib saddr . mark . iif oif missing drop\n This can be done with:\n sudo nft create table inet test\n sudo nft create chain inet test test_chain '{ type filter hook prerouting priority filter + 10; policy accept; }'\n sudo nft add rule inet test test_chain meta nfproto ipv6 fib saddr . mark . iif oif missing drop\n - Run:\n sudo ip -6 rule add table main suppress_prefixlength 0\n - Watch `sudo slabtop -o | grep ip6_dst_cache` to see memory usage increase\n with every incoming ipv6 packet.\n\nThis patch exposes the protocol-specific flags to the protocol\nspecific `suppress` function, and check the protocol-specific `flags`\nargument for RT6_LOOKUP_F_DST_NOREF instead of the generic\nFIB_LOOKUP_NOREF when decreasing the refcount, like this.\n\n[1]: https://github.com/torvalds/linux/blob/ca7a03c4175366a92cee0ccc4fec0038c3266e26/net/ipv6/fib6_rules.c#L71\n[2]: https://github.com/torvalds/linux/blob/ca7a03c4175366a92cee0ccc4fec0038c3266e26/net/ipv6/fib6_rules.c#L99"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/net/fib_rules.h",
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"net/core/fib_rules.c",
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"net/ipv4/fib_rules.c",
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"net/ipv6/fib6_rules.c"
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],
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"versions": [
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{
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"version": "ca7a03c4175366a92cee0ccc4fec0038c3266e26",
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"lessThan": "ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29",
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"status": "affected",
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},
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{
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"version": "ca7a03c4175366a92cee0ccc4fec0038c3266e26",
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"lessThan": "209d35ee34e25f9668c404350a1c86d914c54ffa",
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},
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},
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"version": "d37c966752043733eb847dd897d6e3405084c559",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ecc265624956ea784cb2bd2b31a95bd54c4f5f13",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.2.19",
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"lessThan": "5.3",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.3.4",
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"lessThan": "5.4",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/net/fib_rules.h",
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"net/core/fib_rules.c",
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"net/ipv4/fib_rules.c",
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"net/ipv6/fib6_rules.c"
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],
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"versions": [
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{
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"version": "5.4",
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"status": "affected"
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},
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{
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"version": "0",
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"status": "unaffected",
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},
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{
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"version": "5.4.164",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.84",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.7",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.16",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"title": "ipv6: fix memory leak in fib6_rule_suppress",
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"timestamp": "2024-06-17T17:34:31.593424Z",
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"id": "CVE-2021-47546",
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