github - ghsa-q54v-653w-2v9v

ghsa-q54v-653w-2v9v

Vulnerability from github

Published

2024-04-10 21:30

Modified

2024-04-10 21:30

Details

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: CT, Fix multiple allocations and memleak of mod acts

CT clear action offload adds additional mod hdr actions to the flow's original mod actions in order to clear the registers which hold ct_state. When such flow also includes encap action, a neigh update event can cause the driver to unoffload the flow and then reoffload it.

Each time this happens, the ct clear handling adds that same set of mod hdr actions to reset ct_state until the max of mod hdr actions is reached.

Also the driver never releases the allocated mod hdr actions and causing a memleak.

Fix above two issues by moving CT clear mod acts allocation into the parsing actions phase and only use it when offloading the rule. The release of mod acts will be done in the normal flow_put().

backtrace: [<000000007316e2f3>] krealloc+0x83/0xd0 [<00000000ef157de1>] mlx5e_mod_hdr_alloc+0x147/0x300 [mlx5_core] [<00000000970ce4ae>] mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core] [<0000000067c5fa17>] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core] [<00000000d032eb98>] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0 [mlx5_core] [<00000000fd23b869>] mlx5_tc_ct_flow_offload+0x272/0x1f10 [mlx5_core] [<000000004fc24acc>] mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core] [<00000000dc741c17>] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core] [<00000000e92e49d7>] mlx5e_rep_update_flows+0x6e4/0x9b0 [mlx5_core] [<00000000f60f5602>] mlx5e_rep_neigh_update+0x39a/0x5d0 [mlx5_core]

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47199"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-10T19:15:48Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: CT, Fix multiple allocations and memleak of mod acts\n\nCT clear action offload adds additional mod hdr actions to the\nflow\u0027s original mod actions in order to clear the registers which\nhold ct_state.\nWhen such flow also includes encap action, a neigh update event\ncan cause the driver to unoffload the flow and then reoffload it.\n\nEach time this happens, the ct clear handling adds that same set\nof mod hdr actions to reset ct_state until the max of mod hdr\nactions is reached.\n\nAlso the driver never releases the allocated mod hdr actions and\ncausing a memleak.\n\nFix above two issues by moving CT clear mod acts allocation\ninto the parsing actions phase and only use it when offloading the rule.\nThe release of mod acts will be done in the normal flow_put().\n\n backtrace:\n    [\u003c000000007316e2f3\u003e] krealloc+0x83/0xd0\n    [\u003c00000000ef157de1\u003e] mlx5e_mod_hdr_alloc+0x147/0x300 [mlx5_core]\n    [\u003c00000000970ce4ae\u003e] mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core]\n    [\u003c0000000067c5fa17\u003e] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core]\n    [\u003c00000000d032eb98\u003e] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0 [mlx5_core]\n    [\u003c00000000fd23b869\u003e] mlx5_tc_ct_flow_offload+0x272/0x1f10 [mlx5_core]\n    [\u003c000000004fc24acc\u003e] mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core]\n    [\u003c00000000dc741c17\u003e] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core]\n    [\u003c00000000e92e49d7\u003e] mlx5e_rep_update_flows+0x6e4/0x9b0 [mlx5_core]\n    [\u003c00000000f60f5602\u003e] mlx5e_rep_neigh_update+0x39a/0x5d0 [mlx5_core]",
  "id": "GHSA-q54v-653w-2v9v",
  "modified": "2024-04-10T21:30:31Z",
  "published": "2024-04-10T21:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47199"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/486e8de6e233ff2999493533c6259d1cb538653b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

cve-2021-47199

Vulnerability from cvelistv5

Published

2024-04-10 18:56

Modified

2024-11-04 12:01

Severity ?

Summary

net/mlx5e: CT, Fix multiple allocations and memleak of mod acts

References

▼	URL	Tags
	https://git.kernel.org/stable/c/486e8de6e233ff2999493533c6259d1cb538653b
	https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2

Impacted products

Vendor

Product

Version

▼

Linux

Version: 1ef3018f5af3
Version: 1ef3018f5af3

Linux

Version: 5.7

Show details on NVD website

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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