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EUVD-2026-344340
European Vulnerability Database identifier assigned by ENISAReserved
2026-10-02 07:56
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": "2026-10-02T07:56:03.332004+00:00",
"id": "EUVD-2026-344340"
}
CVE-2021-46955 (GCVE-0-2021-46955)
Vulnerability from cvelistv5 – Published: 2024-02-27 18:46 – Updated: 2026-08-05 08:45
VLAI
EPSS
VEX
Title
openvswitch: fix stack OOB read while fragmenting IPv4 packets
Summary
In the Linux kernel, the following vulnerability has been resolved:
openvswitch: fix stack OOB read while fragmenting IPv4 packets
running openvswitch on kernels built with KASAN, it's possible to see the
following splat while testing fragmentation of IPv4 packets:
BUG: KASAN: stack-out-of-bounds in ip_do_fragment+0x1b03/0x1f60
Read of size 1 at addr ffff888112fc713c by task handler2/1367
CPU: 0 PID: 1367 Comm: handler2 Not tainted 5.12.0-rc6+ #418
Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014
Call Trace:
dump_stack+0x92/0xc1
print_address_description.constprop.7+0x1a/0x150
kasan_report.cold.13+0x7f/0x111
ip_do_fragment+0x1b03/0x1f60
ovs_fragment+0x5bf/0x840 [openvswitch]
do_execute_actions+0x1bd5/0x2400 [openvswitch]
ovs_execute_actions+0xc8/0x3d0 [openvswitch]
ovs_packet_cmd_execute+0xa39/0x1150 [openvswitch]
genl_family_rcv_msg_doit.isra.15+0x227/0x2d0
genl_rcv_msg+0x287/0x490
netlink_rcv_skb+0x120/0x380
genl_rcv+0x24/0x40
netlink_unicast+0x439/0x630
netlink_sendmsg+0x719/0xbf0
sock_sendmsg+0xe2/0x110
____sys_sendmsg+0x5ba/0x890
___sys_sendmsg+0xe9/0x160
__sys_sendmsg+0xd3/0x170
do_syscall_64+0x33/0x40
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f957079db07
Code: c3 66 90 41 54 41 89 d4 55 48 89 f5 53 89 fb 48 83 ec 10 e8 eb ec ff ff 44 89 e2 48 89 ee 89 df 41 89 c0 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 24 ed ff ff 48
RSP: 002b:00007f956ce35a50 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 00007f957079db07
RDX: 0000000000000000 RSI: 00007f956ce35ae0 RDI: 0000000000000019
RBP: 00007f956ce35ae0 R08: 0000000000000000 R09: 00007f9558006730
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f956ce37308 R14: 00007f956ce35f80 R15: 00007f956ce35ae0
The buggy address belongs to the page:
page:00000000af2a1d93 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112fc7
flags: 0x17ffffc0000000()
raw: 0017ffffc0000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
addr ffff888112fc713c is located in stack of task handler2/1367 at offset 180 in frame:
ovs_fragment+0x0/0x840 [openvswitch]
this frame has 2 objects:
[32, 144) 'ovs_dst'
[192, 424) 'ovs_rt'
Memory state around the buggy address:
ffff888112fc7000: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888112fc7080: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00
>ffff888112fc7100: 00 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00
^
ffff888112fc7180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888112fc7200: 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00
for IPv4 packets, ovs_fragment() uses a temporary struct dst_entry. Then,
in the following call graph:
ip_do_fragment()
ip_skb_dst_mtu()
ip_dst_mtu_maybe_forward()
ip_mtu_locked()
the pointer to struct dst_entry is used as pointer to struct rtable: this
turns the access to struct members like rt_mtu_locked into an OOB read in
the stack. Fix this changing the temporary variable used for IPv4 packets
in ovs_fragment(), similarly to what is done for IPv6 few lines below.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-28 17:01 UTC
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
119bbaa6795a4f4aed46994cc7d9ab01989c87e3 , < b1d7280f9ba1bfdbc3af5bdb82e51f014854f26f
(git)
Affected: d543907a4730400f5c5b684c57cb5bbbfd6136ab , < 23e17ec1a5eb53fe39cc34fa5592686d5acd0dac (git) Affected: 8387fbac8e18e26a60559adc63e0b7067303b0a4 , < 5a52fa8ad45b5a593ed416adf326538638454ff1 (git) Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < df9e900de24637be41879e2c50afb713ec4e8b2e (git) Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < 490ad0a2390442d0a7b8c00972a83dbb09cab142 (git) Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < a1478374b0bda89b4277a8afd39208271faad4be (git) Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < d841d3cf5297fde4ce6a41ff35451d0e82917f3e (git) Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < b3502b04e84ac5349be95fc033c17bd701d2787a (git) Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < 7c0ea5930c1c211931819d83cfb157bff1539a4c (git) Affected: df9ece1148e2ec242871623dedb004f7a1387125 (git) Affected: 4.4.134 , < 4.4.269 (semver) Affected: 4.9.104 , < 4.9.269 (semver) Affected: 4.14.45 , < 4.14.233 (semver) Affected: 3.16.57 , < 3.17 (semver) |
|
| Linux | Linux |
Affected:
4.16
Unaffected: 0 , < 4.16 (semver) Unaffected: 4.4.269 , ≤ 4.4.* (semver) Unaffected: 4.9.269 , ≤ 4.9.* (semver) Unaffected: 4.14.233 , ≤ 4.14.* (semver) Unaffected: 4.19.191 , ≤ 4.19.* (semver) Unaffected: 5.4.118 , ≤ 5.4.* (semver) Unaffected: 5.10.36 , ≤ 5.10.* (semver) Unaffected: 5.11.20 , ≤ 5.11.* (semver) Unaffected: 5.12.3 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix) |
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: fix stack OOB read while fragmenting IPv4 packets\n\nrunning openvswitch on kernels built with KASAN, it\u0027s possible to see the\nfollowing splat while testing fragmentation of IPv4 packets:\n\n BUG: KASAN: stack-out-of-bounds in ip_do_fragment+0x1b03/0x1f60\n Read of size 1 at addr ffff888112fc713c by task handler2/1367\n\n CPU: 0 PID: 1367 Comm: handler2 Not tainted 5.12.0-rc6+ #418\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\n Call Trace:\n dump_stack+0x92/0xc1\n print_address_description.constprop.7+0x1a/0x150\n kasan_report.cold.13+0x7f/0x111\n ip_do_fragment+0x1b03/0x1f60\n ovs_fragment+0x5bf/0x840 [openvswitch]\n do_execute_actions+0x1bd5/0x2400 [openvswitch]\n ovs_execute_actions+0xc8/0x3d0 [openvswitch]\n ovs_packet_cmd_execute+0xa39/0x1150 [openvswitch]\n genl_family_rcv_msg_doit.isra.15+0x227/0x2d0\n genl_rcv_msg+0x287/0x490\n netlink_rcv_skb+0x120/0x380\n genl_rcv+0x24/0x40\n netlink_unicast+0x439/0x630\n netlink_sendmsg+0x719/0xbf0\n sock_sendmsg+0xe2/0x110\n ____sys_sendmsg+0x5ba/0x890\n ___sys_sendmsg+0xe9/0x160\n __sys_sendmsg+0xd3/0x170\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f957079db07\n Code: c3 66 90 41 54 41 89 d4 55 48 89 f5 53 89 fb 48 83 ec 10 e8 eb ec ff ff 44 89 e2 48 89 ee 89 df 41 89 c0 b8 2e 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 24 ed ff ff 48\n RSP: 002b:00007f956ce35a50 EFLAGS: 00000293 ORIG_RAX: 000000000000002e\n RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 00007f957079db07\n RDX: 0000000000000000 RSI: 00007f956ce35ae0 RDI: 0000000000000019\n RBP: 00007f956ce35ae0 R08: 0000000000000000 R09: 00007f9558006730\n R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000\n R13: 00007f956ce37308 R14: 00007f956ce35f80 R15: 00007f956ce35ae0\n\n The buggy address belongs to the page:\n page:00000000af2a1d93 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112fc7\n flags: 0x17ffffc0000000()\n raw: 0017ffffc0000000 0000000000000000 dead000000000122 0000000000000000\n raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n addr ffff888112fc713c is located in stack of task handler2/1367 at offset 180 in frame:\n ovs_fragment+0x0/0x840 [openvswitch]\n\n this frame has 2 objects:\n [32, 144) \u0027ovs_dst\u0027\n [192, 424) \u0027ovs_rt\u0027\n\n Memory state around the buggy address:\n ffff888112fc7000: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ffff888112fc7080: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00\n \u003effff888112fc7100: 00 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00\n ^\n ffff888112fc7180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ffff888112fc7200: 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00\n\nfor IPv4 packets, ovs_fragment() uses a temporary struct dst_entry. Then,\nin the following call graph:\n\n ip_do_fragment()\n ip_skb_dst_mtu()\n ip_dst_mtu_maybe_forward()\n ip_mtu_locked()\n\nthe pointer to struct dst_entry is used as pointer to struct rtable: this\nturns the access to struct members like rt_mtu_locked into an OOB read in\nthe stack. Fix this changing the temporary variable used for IPv4 packets\nin ovs_fragment(), similarly to what is done for IPv6 few lines below."
}
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"metrics": [
{
"cvssV3_1": {
"baseScore": 8.2,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
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{
"lang": "en",
"value": "AV:N - In common OVS deployments with conntrack (e.g. OVN/OpenStack security groups), a remote attacker\u2019s fragmented IPv4 packets are reassembled by ovs_ct_handle_fragments (setting MRU), then do_output calls ovs_fragment on output\u2014so the vulnerable path runs on unauthenticated network packet processing.\nAC:L - Sending fragmented IPv4 traffic that completes CT reassembly and is then output deterministically hits ovs_fragment; OVS+CT being configured is a normal deployment precondition for this subsystem, not an attacker-uncontrollable race or rare condition.\nPR:N - The network/CT path runs in the datapath receive path with no authentication; the attacker only needs to deliver packets to an OVS port that applies CT then output, and needs no local privileges on the host.\nUI:N - Exploitation is triggered by received packets processed automatically in the OVS datapath; no victim user action is required.\nS:U - Impact stays within the host kernel/networking authority (stack OOB read during fragmentation); it is not a VM escape, IOMMU bypass, or other cross-boundary issue.\nC:L - The flaw is a strictly bounded stack OOB read of a few rtable fields (e.g. rt_mtu_locked/rt_pmtu) past the temporary dst_entry, used only for MTU decisions\u2014limited disclosure, not an arbitrary/unbounded read primitive.\nI:N - This is a read-only stack OOB with no out-of-bounds write, UAF, or other kernel memory corruption write/control-flow primitive.\nA:H - The OOB access is reported as a KASAN stack-out-of-bounds fault in the fix, and a remote attacker can retrigger fragmentation repeatedly in softirq/datapath context, which is defensibly a high availability impact on hardened/debug kernels."
}
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},
{
"url": "https://git.kernel.org/stable/c/5a52fa8ad45b5a593ed416adf326538638454ff1"
},
{
"url": "https://git.kernel.org/stable/c/df9e900de24637be41879e2c50afb713ec4e8b2e"
},
{
"url": "https://git.kernel.org/stable/c/490ad0a2390442d0a7b8c00972a83dbb09cab142"
},
{
"url": "https://git.kernel.org/stable/c/a1478374b0bda89b4277a8afd39208271faad4be"
},
{
"url": "https://git.kernel.org/stable/c/d841d3cf5297fde4ce6a41ff35451d0e82917f3e"
},
{
"url": "https://git.kernel.org/stable/c/b3502b04e84ac5349be95fc033c17bd701d2787a"
},
{
"url": "https://git.kernel.org/stable/c/7c0ea5930c1c211931819d83cfb157bff1539a4c"
}
],
"title": "openvswitch: fix stack OOB read while fragmenting IPv4 packets",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-46955",
"datePublished": "2024-02-27T18:46:57.428Z",
"dateReserved": "2024-02-27T18:42:55.937Z",
"dateUpdated": "2026-08-05T08:45:12.777Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"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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