CVE-2021-47099 (GCVE-0-2021-47099)

Vulnerability from cvelistv5 – Published: 2024-03-04 18:10 – Updated: 2025-05-04 07:04
VLAI?
Title
veth: ensure skb entering GRO are not cloned.
Summary
In the Linux kernel, the following vulnerability has been resolved: veth: ensure skb entering GRO are not cloned. After commit d3256efd8e8b ("veth: allow enabling NAPI even without XDP"), if GRO is enabled on a veth device and TSO is disabled on the peer device, TCP skbs will go through the NAPI callback. If there is no XDP program attached, the veth code does not perform any share check, and shared/cloned skbs could enter the GRO engine. Ignat reported a BUG triggered later-on due to the above condition: [ 53.970529][ C1] kernel BUG at net/core/skbuff.c:3574! [ 53.981755][ C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI [ 53.982634][ C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5+ #25 [ 53.982634][ C1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 [ 53.982634][ C1] RIP: 0010:skb_shift+0x13ef/0x23b0 [ 53.982634][ C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 41 0c 00 00 41 80 7f 02 00 4d 8d b5 d0 00 00 00 0f 85 74 f5 ff ff <0f> 0b 4d 8d 77 20 be 04 00 00 00 4c 89 44 24 78 4c 89 f7 4c 89 8c [ 53.982634][ C1] RSP: 0018:ffff8881008f7008 EFLAGS: 00010246 [ 53.982634][ C1] RAX: 0000000000000000 RBX: ffff8881180b4c80 RCX: 0000000000000000 [ 53.982634][ C1] RDX: 0000000000000002 RSI: ffff8881180b4d3c RDI: ffff88810bc9cac2 [ 53.982634][ C1] RBP: ffff8881008f70b8 R08: ffff8881180b4cf4 R09: ffff8881180b4cf0 [ 53.982634][ C1] R10: ffffed1022999e5c R11: 0000000000000002 R12: 0000000000000590 [ 53.982634][ C1] R13: ffff88810f940c80 R14: ffff88810f940d50 R15: ffff88810bc9cac0 [ 53.982634][ C1] FS: 0000000000000000(0000) GS:ffff888235880000(0000) knlGS:0000000000000000 [ 53.982634][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 53.982634][ C1] CR2: 00007ff5f9b86680 CR3: 0000000108ce8004 CR4: 0000000000170ee0 [ 53.982634][ C1] Call Trace: [ 53.982634][ C1] <TASK> [ 53.982634][ C1] tcp_sacktag_walk+0xaba/0x18e0 [ 53.982634][ C1] tcp_sacktag_write_queue+0xe7b/0x3460 [ 53.982634][ C1] tcp_ack+0x2666/0x54b0 [ 53.982634][ C1] tcp_rcv_established+0x4d9/0x20f0 [ 53.982634][ C1] tcp_v4_do_rcv+0x551/0x810 [ 53.982634][ C1] tcp_v4_rcv+0x22ed/0x2ed0 [ 53.982634][ C1] ip_protocol_deliver_rcu+0x96/0xaf0 [ 53.982634][ C1] ip_local_deliver_finish+0x1e0/0x2f0 [ 53.982634][ C1] ip_sublist_rcv_finish+0x211/0x440 [ 53.982634][ C1] ip_list_rcv_finish.constprop.0+0x424/0x660 [ 53.982634][ C1] ip_list_rcv+0x2c8/0x410 [ 53.982634][ C1] __netif_receive_skb_list_core+0x65c/0x910 [ 53.982634][ C1] netif_receive_skb_list_internal+0x5f9/0xcb0 [ 53.982634][ C1] napi_complete_done+0x188/0x6e0 [ 53.982634][ C1] gro_cell_poll+0x10c/0x1d0 [ 53.982634][ C1] __napi_poll+0xa1/0x530 [ 53.982634][ C1] net_rx_action+0x567/0x1270 [ 53.982634][ C1] __do_softirq+0x28a/0x9ba [ 53.982634][ C1] run_ksoftirqd+0x32/0x60 [ 53.982634][ C1] smpboot_thread_fn+0x559/0x8c0 [ 53.982634][ C1] kthread+0x3b9/0x490 [ 53.982634][ C1] ret_from_fork+0x22/0x30 [ 53.982634][ C1] </TASK> Address the issue by skipping the GRO stage for shared or cloned skbs. To reduce the chance of OoO, try to unclone the skbs before giving up. v1 -> v2: - use avoid skb_copy and fallback to netif_receive_skb - Eric
Severity ?
6 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d3256efd8e8b234a6251e4d4580bd2c3c31fdc4c , < d2269ae48598e05b59ec9ea9e6e44fd33941130d (git)
Affected: d3256efd8e8b234a6251e4d4580bd2c3c31fdc4c , < 9695b7de5b4760ed22132aca919570c0190cb0ce (git)
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    Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.12 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nveth: ensure skb entering GRO are not cloned.\n\nAfter commit d3256efd8e8b (\"veth: allow enabling NAPI even without XDP\"),\nif GRO is enabled on a veth device and TSO is disabled on the peer\ndevice, TCP skbs will go through the NAPI callback. If there is no XDP\nprogram attached, the veth code does not perform any share check, and\nshared/cloned skbs could enter the GRO engine.\n\nIgnat reported a BUG triggered later-on due to the above condition:\n\n[   53.970529][    C1] kernel BUG at net/core/skbuff.c:3574!\n[   53.981755][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\n[   53.982634][    C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5+ #25\n[   53.982634][    C1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n[   53.982634][    C1] RIP: 0010:skb_shift+0x13ef/0x23b0\n[   53.982634][    C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0\n7f 08 84 c0 0f 85 41 0c 00 00 41 80 7f 02 00 4d 8d b5 d0 00 00 00 0f\n85 74 f5 ff ff \u003c0f\u003e 0b 4d 8d 77 20 be 04 00 00 00 4c 89 44 24 78 4c 89\nf7 4c 89 8c\n[   53.982634][    C1] RSP: 0018:ffff8881008f7008 EFLAGS: 00010246\n[   53.982634][    C1] RAX: 0000000000000000 RBX: ffff8881180b4c80 RCX: 0000000000000000\n[   53.982634][    C1] RDX: 0000000000000002 RSI: ffff8881180b4d3c RDI: ffff88810bc9cac2\n[   53.982634][    C1] RBP: ffff8881008f70b8 R08: ffff8881180b4cf4 R09: ffff8881180b4cf0\n[   53.982634][    C1] R10: ffffed1022999e5c R11: 0000000000000002 R12: 0000000000000590\n[   53.982634][    C1] R13: ffff88810f940c80 R14: ffff88810f940d50 R15: ffff88810bc9cac0\n[   53.982634][    C1] FS:  0000000000000000(0000) GS:ffff888235880000(0000) knlGS:0000000000000000\n[   53.982634][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[   53.982634][    C1] CR2: 00007ff5f9b86680 CR3: 0000000108ce8004 CR4: 0000000000170ee0\n[   53.982634][    C1] Call Trace:\n[   53.982634][    C1]  \u003cTASK\u003e\n[   53.982634][    C1]  tcp_sacktag_walk+0xaba/0x18e0\n[   53.982634][    C1]  tcp_sacktag_write_queue+0xe7b/0x3460\n[   53.982634][    C1]  tcp_ack+0x2666/0x54b0\n[   53.982634][    C1]  tcp_rcv_established+0x4d9/0x20f0\n[   53.982634][    C1]  tcp_v4_do_rcv+0x551/0x810\n[   53.982634][    C1]  tcp_v4_rcv+0x22ed/0x2ed0\n[   53.982634][    C1]  ip_protocol_deliver_rcu+0x96/0xaf0\n[   53.982634][    C1]  ip_local_deliver_finish+0x1e0/0x2f0\n[   53.982634][    C1]  ip_sublist_rcv_finish+0x211/0x440\n[   53.982634][    C1]  ip_list_rcv_finish.constprop.0+0x424/0x660\n[   53.982634][    C1]  ip_list_rcv+0x2c8/0x410\n[   53.982634][    C1]  __netif_receive_skb_list_core+0x65c/0x910\n[   53.982634][    C1]  netif_receive_skb_list_internal+0x5f9/0xcb0\n[   53.982634][    C1]  napi_complete_done+0x188/0x6e0\n[   53.982634][    C1]  gro_cell_poll+0x10c/0x1d0\n[   53.982634][    C1]  __napi_poll+0xa1/0x530\n[   53.982634][    C1]  net_rx_action+0x567/0x1270\n[   53.982634][    C1]  __do_softirq+0x28a/0x9ba\n[   53.982634][    C1]  run_ksoftirqd+0x32/0x60\n[   53.982634][    C1]  smpboot_thread_fn+0x559/0x8c0\n[   53.982634][    C1]  kthread+0x3b9/0x490\n[   53.982634][    C1]  ret_from_fork+0x22/0x30\n[   53.982634][    C1]  \u003c/TASK\u003e\n\nAddress the issue by skipping the GRO stage for shared or cloned skbs.\nTo reduce the chance of OoO, try to unclone the skbs before giving up.\n\nv1 -\u003e v2:\n - use avoid skb_copy and fallback to netif_receive_skb  - Eric"
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      "title": "veth: ensure skb entering GRO are not cloned.",
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    "cveId": "CVE-2021-47099",
    "datePublished": "2024-03-04T18:10:51.200Z",
    "dateReserved": "2024-02-29T22:33:44.301Z",
    "dateUpdated": "2025-05-04T07:04:09.396Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:24:39.924Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"HIGH\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47099\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-03-12T14:24:44.909749Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:16.883Z\"}}], \"cna\": {\"title\": \"veth: ensure skb entering GRO are not cloned.\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"d3256efd8e8b234a6251e4d4580bd2c3c31fdc4c\", \"lessThan\": \"d2269ae48598e05b59ec9ea9e6e44fd33941130d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d3256efd8e8b234a6251e4d4580bd2c3c31fdc4c\", \"lessThan\": \"9695b7de5b4760ed22132aca919570c0190cb0ce\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/veth.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/veth.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d\"}, {\"url\": \"https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nveth: ensure skb entering GRO are not cloned.\\n\\nAfter commit d3256efd8e8b (\\\"veth: allow enabling NAPI even without XDP\\\"),\\nif GRO is enabled on a veth device and TSO is disabled on the peer\\ndevice, TCP skbs will go through the NAPI callback. If there is no XDP\\nprogram attached, the veth code does not perform any share check, and\\nshared/cloned skbs could enter the GRO engine.\\n\\nIgnat reported a BUG triggered later-on due to the above condition:\\n\\n[   53.970529][    C1] kernel BUG at net/core/skbuff.c:3574!\\n[   53.981755][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\\n[   53.982634][    C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5+ #25\\n[   53.982634][    C1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\\n[   53.982634][    C1] RIP: 0010:skb_shift+0x13ef/0x23b0\\n[   53.982634][    C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0\\n7f 08 84 c0 0f 85 41 0c 00 00 41 80 7f 02 00 4d 8d b5 d0 00 00 00 0f\\n85 74 f5 ff ff \u003c0f\u003e 0b 4d 8d 77 20 be 04 00 00 00 4c 89 44 24 78 4c 89\\nf7 4c 89 8c\\n[   53.982634][    C1] RSP: 0018:ffff8881008f7008 EFLAGS: 00010246\\n[   53.982634][    C1] RAX: 0000000000000000 RBX: ffff8881180b4c80 RCX: 0000000000000000\\n[   53.982634][    C1] RDX: 0000000000000002 RSI: ffff8881180b4d3c RDI: ffff88810bc9cac2\\n[   53.982634][    C1] RBP: ffff8881008f70b8 R08: ffff8881180b4cf4 R09: ffff8881180b4cf0\\n[   53.982634][    C1] R10: ffffed1022999e5c R11: 0000000000000002 R12: 0000000000000590\\n[   53.982634][    C1] R13: ffff88810f940c80 R14: ffff88810f940d50 R15: ffff88810bc9cac0\\n[   53.982634][    C1] FS:  0000000000000000(0000) GS:ffff888235880000(0000) knlGS:0000000000000000\\n[   53.982634][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[   53.982634][    C1] CR2: 00007ff5f9b86680 CR3: 0000000108ce8004 CR4: 0000000000170ee0\\n[   53.982634][    C1] Call Trace:\\n[   53.982634][    C1]  \u003cTASK\u003e\\n[   53.982634][    C1]  tcp_sacktag_walk+0xaba/0x18e0\\n[   53.982634][    C1]  tcp_sacktag_write_queue+0xe7b/0x3460\\n[   53.982634][    C1]  tcp_ack+0x2666/0x54b0\\n[   53.982634][    C1]  tcp_rcv_established+0x4d9/0x20f0\\n[   53.982634][    C1]  tcp_v4_do_rcv+0x551/0x810\\n[   53.982634][    C1]  tcp_v4_rcv+0x22ed/0x2ed0\\n[   53.982634][    C1]  ip_protocol_deliver_rcu+0x96/0xaf0\\n[   53.982634][    C1]  ip_local_deliver_finish+0x1e0/0x2f0\\n[   53.982634][    C1]  ip_sublist_rcv_finish+0x211/0x440\\n[   53.982634][    C1]  ip_list_rcv_finish.constprop.0+0x424/0x660\\n[   53.982634][    C1]  ip_list_rcv+0x2c8/0x410\\n[   53.982634][    C1]  __netif_receive_skb_list_core+0x65c/0x910\\n[   53.982634][    C1]  netif_receive_skb_list_internal+0x5f9/0xcb0\\n[   53.982634][    C1]  napi_complete_done+0x188/0x6e0\\n[   53.982634][    C1]  gro_cell_poll+0x10c/0x1d0\\n[   53.982634][    C1]  __napi_poll+0xa1/0x530\\n[   53.982634][    C1]  net_rx_action+0x567/0x1270\\n[   53.982634][    C1]  __do_softirq+0x28a/0x9ba\\n[   53.982634][    C1]  run_ksoftirqd+0x32/0x60\\n[   53.982634][    C1]  smpboot_thread_fn+0x559/0x8c0\\n[   53.982634][    C1]  kthread+0x3b9/0x490\\n[   53.982634][    C1]  ret_from_fork+0x22/0x30\\n[   53.982634][    C1]  \u003c/TASK\u003e\\n\\nAddress the issue by skipping the GRO stage for shared or cloned skbs.\\nTo reduce the chance of OoO, try to unclone the skbs before giving up.\\n\\nv1 -\u003e v2:\\n - use avoid skb_copy and fallback to netif_receive_skb  - Eric\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:35:12.769Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47099\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:35:12.769Z\", \"dateReserved\": \"2024-02-29T22:33:44.301Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-04T18:10:51.200Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • 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.



Detection rules are retrieved from Rulezet.