CVE-2026-43199 (GCVE-0-2026-43199)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-08-05 12:26
VLAI
Title
net/mlx5e: Fix "scheduling while atomic" in IPsec MAC address query
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix "scheduling while atomic" in IPsec MAC address query Fix a "scheduling while atomic" bug in mlx5e_ipsec_init_macs() by replacing mlx5_query_mac_address() with ether_addr_copy() to get the local MAC address directly from netdev->dev_addr. The issue occurs because mlx5_query_mac_address() queries the hardware which involves mlx5_cmd_exec() that can sleep, but it is called from the mlx5e_ipsec_handle_event workqueue which runs in atomic context. The MAC address is already available in netdev->dev_addr, so no need to query hardware. This avoids the sleeping call and resolves the bug. Call trace: BUG: scheduling while atomic: kworker/u112:2/69344/0x00000200 __schedule+0x7ab/0xa20 schedule+0x1c/0xb0 schedule_timeout+0x6e/0xf0 __wait_for_common+0x91/0x1b0 cmd_exec+0xa85/0xff0 [mlx5_core] mlx5_cmd_exec+0x1f/0x50 [mlx5_core] mlx5_query_nic_vport_mac_address+0x7b/0xd0 [mlx5_core] mlx5_query_mac_address+0x19/0x30 [mlx5_core] mlx5e_ipsec_init_macs+0xc1/0x720 [mlx5_core] mlx5e_ipsec_build_accel_xfrm_attrs+0x422/0x670 [mlx5_core] mlx5e_ipsec_handle_event+0x2b9/0x460 [mlx5_core] process_one_work+0x178/0x2e0 worker_thread+0x2ea/0x430
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cee137a634318bfbda18ee5af45d300153b57fa5 , < e1407fb7c337373dfaaae2445d828b0b9ae26a29 (git)
Affected: cee137a634318bfbda18ee5af45d300153b57fa5 , < 57957bc7f1865778ec9b1618e15515feb6df7eb4 (git)
Affected: cee137a634318bfbda18ee5af45d300153b57fa5 , < 546de94e41e92e1f7dc6213615fb7c794d05db98 (git)
Affected: cee137a634318bfbda18ee5af45d300153b57fa5 , < 859380694f434597407632c29f30fdb5e763e6cc (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix \"scheduling while atomic\" in IPsec MAC address query\n\nFix a \"scheduling while atomic\" bug in mlx5e_ipsec_init_macs() by\nreplacing mlx5_query_mac_address() with ether_addr_copy() to get the\nlocal MAC address directly from netdev-\u003edev_addr.\n\nThe issue occurs because mlx5_query_mac_address() queries the hardware\nwhich involves mlx5_cmd_exec() that can sleep, but it is called from\nthe mlx5e_ipsec_handle_event workqueue which runs in atomic context.\n\nThe MAC address is already available in netdev-\u003edev_addr, so no need\nto query hardware. This avoids the sleeping call and resolves the bug.\n\nCall trace:\n  BUG: scheduling while atomic: kworker/u112:2/69344/0x00000200\n  __schedule+0x7ab/0xa20\n  schedule+0x1c/0xb0\n  schedule_timeout+0x6e/0xf0\n  __wait_for_common+0x91/0x1b0\n  cmd_exec+0xa85/0xff0 [mlx5_core]\n  mlx5_cmd_exec+0x1f/0x50 [mlx5_core]\n  mlx5_query_nic_vport_mac_address+0x7b/0xd0 [mlx5_core]\n  mlx5_query_mac_address+0x19/0x30 [mlx5_core]\n  mlx5e_ipsec_init_macs+0xc1/0x720 [mlx5_core]\n  mlx5e_ipsec_build_accel_xfrm_attrs+0x422/0x670 [mlx5_core]\n  mlx5e_ipsec_handle_event+0x2b9/0x460 [mlx5_core]\n  process_one_work+0x178/0x2e0\n  worker_thread+0x2ea/0x430"
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            "version": "3.1"
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              "value": "AV:N - The vulnerable path runs in mlx5 IPsec packet offload event handling, which can be driven by traffic on an exposed IPsec tunnel. A remote peer can cause the NIC ESN object-change event without local execution on the target.\nAC:L - There is no attacker-controlled race to win; once a packet-offload tunnel SA with ESN is present, the event path deterministically reaches the atomic-sleep bug. Traffic volume/sequence advancement is attacker-influenced.\nPR:N - The SA setup is a normal deployment precondition for the affected IPsec offload service, not a privilege the attacker must hold on the target. The packet sender needs no local account or target-side administrative capability.\nUI:N - No victim user action is needed after the susceptible IPsec offload configuration exists. The trigger is packet/event driven.\nS:U - The impact is within the kernel and the mlx5/IPsec networking subsystem on the same host. It does not cross a VM, IOMMU, or other separate security authority boundary.\nC:N - The bug is a sleeping firmware MAC query while holding a spinlock, not an out-of-bounds access, UAF, or information disclosure primitive. No kernel memory is exposed.\nI:N - The vulnerable call does not corrupt memory or provide an attacker-controlled write. It only performs a blocking command from atomic context.\nA:H - The kernel reports BUG: scheduling while atomic and the scheduler path can panic via panic-on-warn or destabilize the worker/kernel state. The trigger can be repeated, making denial of service high impact."
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    "dateReserved": "2026-05-01T14:12:55.992Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T12:50:38+00:00",
      "cve": "CVE-2026-43199",
      "id": "CVE-2026-43199",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "198",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: net/mlx5e: Fix \"scheduling while atomic\" in IPsec MAC address query",
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      "cve": "CVE-2026-43199",
      "id": "CVE-2026-43199",
      "initial_release_date": "2026-05-09T02:41:09Z",
      "product_status:first_fixed": "55",
      "product_status:known_affected": "441",
      "product_status:known_not_affected": "181",
      "product_status:recommended": "197",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43199",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43199.json",
      "version": "9"
    }
  }
}



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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

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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.


Detection rules are retrieved from Rulezet.