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EUVD-2026-309566
European Vulnerability Database identifier assigned by ENISAReserved
2026-10-02 07:09
Assigner
ENISA
Alias of
a CVE record, shown under related vulnerabilities.
This identifier carries no description, severity or references of its own:
they belong to that CVE.
{
"assigner": "ENISA",
"date_reserved": "2026-10-02T07:09:18.019974+00:00",
"id": "EUVD-2026-309566"
}
CVE-2021-47146 (GCVE-0-2021-47146)
Vulnerability from cvelistv5 – Published: 2024-03-25 09:07 – Updated: 2026-05-11 13:48
VLAI
EPSS
VEX
Title
mld: fix panic in mld_newpack()
Summary
In the Linux kernel, the following vulnerability has been resolved:
mld: fix panic in mld_newpack()
mld_newpack() doesn't allow to allocate high order page,
only order-0 allocation is allowed.
If headroom size is too large, a kernel panic could occur in skb_put().
Test commands:
ip netns del A
ip netns del B
ip netns add A
ip netns add B
ip link add veth0 type veth peer name veth1
ip link set veth0 netns A
ip link set veth1 netns B
ip netns exec A ip link set lo up
ip netns exec A ip link set veth0 up
ip netns exec A ip -6 a a 2001:db8:0::1/64 dev veth0
ip netns exec B ip link set lo up
ip netns exec B ip link set veth1 up
ip netns exec B ip -6 a a 2001:db8:0::2/64 dev veth1
for i in {1..99}
do
let A=$i-1
ip netns exec A ip link add ip6gre$i type ip6gre \
local 2001:db8:$A::1 remote 2001:db8:$A::2 encaplimit 100
ip netns exec A ip -6 a a 2001:db8:$i::1/64 dev ip6gre$i
ip netns exec A ip link set ip6gre$i up
ip netns exec B ip link add ip6gre$i type ip6gre \
local 2001:db8:$A::2 remote 2001:db8:$A::1 encaplimit 100
ip netns exec B ip -6 a a 2001:db8:$i::2/64 dev ip6gre$i
ip netns exec B ip link set ip6gre$i up
done
Splat looks like:
kernel BUG at net/core/skbuff.c:110!
invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.12.0+ #891
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:skb_panic+0x15d/0x15f
Code: 92 fe 4c 8b 4c 24 10 53 8b 4d 70 45 89 e0 48 c7 c7 00 ae 79 83
41 57 41 56 41 55 48 8b 54 24 a6 26 f9 ff <0f> 0b 48 8b 6c 24 20 89
34 24 e8 4a 4e 92 fe 8b 34 24 48 c7 c1 20
RSP: 0018:ffff88810091f820 EFLAGS: 00010282
RAX: 0000000000000089 RBX: ffff8881086e9000 RCX: 0000000000000000
RDX: 0000000000000089 RSI: 0000000000000008 RDI: ffffed1020123efb
RBP: ffff888005f6eac0 R08: ffffed1022fc0031 R09: ffffed1022fc0031
R10: ffff888117e00187 R11: ffffed1022fc0030 R12: 0000000000000028
R13: ffff888008284eb0 R14: 0000000000000ed8 R15: 0000000000000ec0
FS: 0000000000000000(0000) GS:ffff888117c00000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8b801c5640 CR3: 0000000033c2c006 CR4: 00000000003706f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
? ip6_mc_hdr.isra.26.constprop.46+0x12a/0x600
? ip6_mc_hdr.isra.26.constprop.46+0x12a/0x600
skb_put.cold.104+0x22/0x22
ip6_mc_hdr.isra.26.constprop.46+0x12a/0x600
? rcu_read_lock_sched_held+0x91/0xc0
mld_newpack+0x398/0x8f0
? ip6_mc_hdr.isra.26.constprop.46+0x600/0x600
? lock_contended+0xc40/0xc40
add_grhead.isra.33+0x280/0x380
add_grec+0x5ca/0xff0
? mld_sendpack+0xf40/0xf40
? lock_downgrade+0x690/0x690
mld_send_initial_cr.part.34+0xb9/0x180
ipv6_mc_dad_complete+0x15d/0x1b0
addrconf_dad_completed+0x8d2/0xbb0
? lock_downgrade+0x690/0x690
? addrconf_rs_timer+0x660/0x660
? addrconf_dad_work+0x73c/0x10e0
addrconf_dad_work+0x73c/0x10e0
Allowing high order page allocation could fix this problem.
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:54 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
72e09ad107e78d69ff4d3b97a69f0aad2b77280f , < 0e35b7457b7b6e73ffeaaca1a577fdf1af0feca1
(git)
Affected: 72e09ad107e78d69ff4d3b97a69f0aad2b77280f , < 17728616a4c85baf0edc975c60ba4e4157684d9a (git) Affected: 72e09ad107e78d69ff4d3b97a69f0aad2b77280f , < 221142038f36d9f28b64e83e954774da4d4ccd17 (git) Affected: 72e09ad107e78d69ff4d3b97a69f0aad2b77280f , < 4b77ad9097067b31237eeeee0bf70f80849680a0 (git) Affected: 72e09ad107e78d69ff4d3b97a69f0aad2b77280f , < 37d697759958d111439080bab7e14d2b0e7b39f5 (git) Affected: 72e09ad107e78d69ff4d3b97a69f0aad2b77280f , < beb39adb150f8f3b516ddf7c39835a9788704d23 (git) Affected: 72e09ad107e78d69ff4d3b97a69f0aad2b77280f , < a76fb9ba545289379acf409653ad5f74417be59c (git) Affected: 72e09ad107e78d69ff4d3b97a69f0aad2b77280f , < 020ef930b826d21c5446fdc9db80fd72a791bc21 (git) |
|
| Linux | Linux |
Affected:
2.6.35
Unaffected: 0 , < 2.6.35 (semver) Unaffected: 4.4.271 , ≤ 4.4.* (semver) Unaffected: 4.9.271 , ≤ 4.9.* (semver) Unaffected: 4.14.235 , ≤ 4.14.* (semver) Unaffected: 4.19.193 , ≤ 4.19.* (semver) Unaffected: 5.4.124 , ≤ 5.4.* (semver) Unaffected: 5.10.42 , ≤ 5.10.* (semver) Unaffected: 5.12.9 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix) |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmld: fix panic in mld_newpack()\n\nmld_newpack() doesn\u0027t allow to allocate high order page,\nonly order-0 allocation is allowed.\nIf headroom size is too large, a kernel panic could occur in skb_put().\n\nTest commands:\n ip netns del A\n ip netns del B\n ip netns add A\n ip netns add B\n ip link add veth0 type veth peer name veth1\n ip link set veth0 netns A\n ip link set veth1 netns B\n\n ip netns exec A ip link set lo up\n ip netns exec A ip link set veth0 up\n ip netns exec A ip -6 a a 2001:db8:0::1/64 dev veth0\n ip netns exec B ip link set lo up\n ip netns exec B ip link set veth1 up\n ip netns exec B ip -6 a a 2001:db8:0::2/64 dev veth1\n for i in {1..99}\n do\n let A=$i-1\n ip netns exec A ip link add ip6gre$i type ip6gre \\\n\tlocal 2001:db8:$A::1 remote 2001:db8:$A::2 encaplimit 100\n ip netns exec A ip -6 a a 2001:db8:$i::1/64 dev ip6gre$i\n ip netns exec A ip link set ip6gre$i up\n\n ip netns exec B ip link add ip6gre$i type ip6gre \\\n\tlocal 2001:db8:$A::2 remote 2001:db8:$A::1 encaplimit 100\n ip netns exec B ip -6 a a 2001:db8:$i::2/64 dev ip6gre$i\n ip netns exec B ip link set ip6gre$i up\n done\n\nSplat looks like:\nkernel BUG at net/core/skbuff.c:110!\ninvalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI\nCPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.12.0+ #891\nWorkqueue: ipv6_addrconf addrconf_dad_work\nRIP: 0010:skb_panic+0x15d/0x15f\nCode: 92 fe 4c 8b 4c 24 10 53 8b 4d 70 45 89 e0 48 c7 c7 00 ae 79 83\n41 57 41 56 41 55 48 8b 54 24 a6 26 f9 ff \u003c0f\u003e 0b 48 8b 6c 24 20 89\n34 24 e8 4a 4e 92 fe 8b 34 24 48 c7 c1 20\nRSP: 0018:ffff88810091f820 EFLAGS: 00010282\nRAX: 0000000000000089 RBX: ffff8881086e9000 RCX: 0000000000000000\nRDX: 0000000000000089 RSI: 0000000000000008 RDI: ffffed1020123efb\nRBP: ffff888005f6eac0 R08: ffffed1022fc0031 R09: ffffed1022fc0031\nR10: ffff888117e00187 R11: ffffed1022fc0030 R12: 0000000000000028\nR13: ffff888008284eb0 R14: 0000000000000ed8 R15: 0000000000000ec0\nFS: 0000000000000000(0000) GS:ffff888117c00000(0000)\nknlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f8b801c5640 CR3: 0000000033c2c006 CR4: 00000000003706f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n ? ip6_mc_hdr.isra.26.constprop.46+0x12a/0x600\n ? ip6_mc_hdr.isra.26.constprop.46+0x12a/0x600\n skb_put.cold.104+0x22/0x22\n ip6_mc_hdr.isra.26.constprop.46+0x12a/0x600\n ? rcu_read_lock_sched_held+0x91/0xc0\n mld_newpack+0x398/0x8f0\n ? ip6_mc_hdr.isra.26.constprop.46+0x600/0x600\n ? lock_contended+0xc40/0xc40\n add_grhead.isra.33+0x280/0x380\n add_grec+0x5ca/0xff0\n ? mld_sendpack+0xf40/0xf40\n ? lock_downgrade+0x690/0x690\n mld_send_initial_cr.part.34+0xb9/0x180\n ipv6_mc_dad_complete+0x15d/0x1b0\n addrconf_dad_completed+0x8d2/0xbb0\n ? lock_downgrade+0x690/0x690\n ? addrconf_rs_timer+0x660/0x660\n ? addrconf_dad_work+0x73c/0x10e0\n addrconf_dad_work+0x73c/0x10e0\n\nAllowing high order page allocation could fix this problem."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T13:48:55.352Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
{
"url": "https://git.kernel.org/stable/c/0e35b7457b7b6e73ffeaaca1a577fdf1af0feca1"
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"url": "https://git.kernel.org/stable/c/beb39adb150f8f3b516ddf7c39835a9788704d23"
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"url": "https://git.kernel.org/stable/c/a76fb9ba545289379acf409653ad5f74417be59c"
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"url": "https://git.kernel.org/stable/c/020ef930b826d21c5446fdc9db80fd72a791bc21"
}
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"title": "mld: fix panic in mld_newpack()",
"x_generator": {
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"cveMetadata": {
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"cveId": "CVE-2021-47146",
"datePublished": "2024-03-25T09:07:43.043Z",
"dateReserved": "2024-03-04T18:12:48.845Z",
"dateUpdated": "2026-05-11T13:48:55.352Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.2"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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