CVE-2022-49295 (GCVE-0-2022-49295)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:01 – Updated: 2026-08-05 08:54
VLAI
Title
nbd: call genl_unregister_family() first in nbd_cleanup()
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: call genl_unregister_family() first in nbd_cleanup() Otherwise there may be race between module removal and the handling of netlink command, which can lead to the oops as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000098 Oops: 0002 [#1] SMP PTI CPU: 1 PID: 31299 Comm: nbd-client Tainted: G E 5.14.0-rc4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:down_write+0x1a/0x50 Call Trace: start_creating+0x89/0x130 debugfs_create_dir+0x1b/0x130 nbd_start_device+0x13d/0x390 [nbd] nbd_genl_connect+0x42f/0x748 [nbd] genl_family_rcv_msg_doit.isra.0+0xec/0x150 genl_rcv_msg+0xe5/0x1e0 netlink_rcv_skb+0x55/0x100 genl_rcv+0x29/0x40 netlink_unicast+0x1a8/0x250 netlink_sendmsg+0x21b/0x430 ____sys_sendmsg+0x2a4/0x2d0 ___sys_sendmsg+0x81/0xc0 __sys_sendmsg+0x62/0xb0 __x64_sys_sendmsg+0x1f/0x30 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae Modules linked in: nbd(E-)
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:45 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 8a1435c862ea09b06be7acda325128dc08458e25 (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 1be608e1ee1f222464b2856bda9b85ab5184a33e (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < c0868f6e728c3c28bef0e8bee89d2daf86a8bbca (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < cbeafa7a79d08ecdb55f8f1d41a11323d0f709db (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 6f505bbb8063fd3a238a4239d2d8c165e5279f6f (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 3d5da1ffba3388c2ae2e6c598855a4d887d3bf79 (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 06c4da89c24e7023ea448cadf8e9daf06a0aae6e (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 4.14.283 , ≤ 4.14.* (semver)
Unaffected: 4.19.247 , ≤ 4.19.* (semver)
Unaffected: 5.4.198 , ≤ 5.4.* (semver)
Unaffected: 5.10.122 , ≤ 5.10.* (semver)
Unaffected: 5.15.47 , ≤ 5.15.* (semver)
Unaffected: 5.17.15 , ≤ 5.17.* (semver)
Unaffected: 5.18.4 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: call genl_unregister_family() first in nbd_cleanup()\n\nOtherwise there may be race between module removal and the handling of\nnetlink command, which can lead to the oops as shown below:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000098\n  Oops: 0002 [#1] SMP PTI\n  CPU: 1 PID: 31299 Comm: nbd-client Tainted: G            E     5.14.0-rc4\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n  RIP: 0010:down_write+0x1a/0x50\n  Call Trace:\n   start_creating+0x89/0x130\n   debugfs_create_dir+0x1b/0x130\n   nbd_start_device+0x13d/0x390 [nbd]\n   nbd_genl_connect+0x42f/0x748 [nbd]\n   genl_family_rcv_msg_doit.isra.0+0xec/0x150\n   genl_rcv_msg+0xe5/0x1e0\n   netlink_rcv_skb+0x55/0x100\n   genl_rcv+0x29/0x40\n   netlink_unicast+0x1a8/0x250\n   netlink_sendmsg+0x21b/0x430\n   ____sys_sendmsg+0x2a4/0x2d0\n   ___sys_sendmsg+0x81/0xc0\n   __sys_sendmsg+0x62/0xb0\n   __x64_sys_sendmsg+0x1f/0x30\n   do_syscall_64+0x3b/0xc0\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n  Modules linked in: nbd(E-)"
          },
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nbd: llamar a genl_unregister_family() primero en nbd_cleanup() De lo contrario, puede haber una ejecuci\u00f3n entre la eliminaci\u00f3n del m\u00f3dulo y la gesti\u00f3n del comando netlink, lo que puede provocar los errores que se muestran a continuaci\u00f3n: ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000098 Error: 0002 [#1] SMP PTI CPU: 1 PID: 31299 Comm: nbd-client Contaminado: GE 5.14.0-rc4 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:down_write+0x1a/0x50 Rastreo de llamadas: start_creating+0x89/0x130 debugfs_create_dir+0x1b/0x130 nbd_start_device+0x13d/0x390 [nbd] nbd_genl_connect+0x42f/0x748 [nbd] genl_family_rcv_msg_doit.isra.0+0xec/0x150 genl_rcv_msg+0xe5/0x1e0 netlink_rcv_skb+0x55/0x100 genl_rcv+0x29/0x40 netlink_unicast+0x1a8/0x250 netlink_sendmsg+0x21b/0x430 ____sys_sendmsg+0x2a4/0x2d0 ___sys_sendmsg+0x81/0xc0 __sys_sendmsg+0x62/0xb0 __x64_sys_sendmsg+0x1f/0x30 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae M\u00f3dulos vinculados en: nbd(E-)"
          }
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                  "value": "AV:L - The vulnerability is reached via local Generic Netlink sendmsg to the nbd family (and concurrent local delete_module); it is not reachable from network packets or remote protocols.\nAC:H - Exploitation requires winning a race against nbd module removal (rmmod/delete_module), which an unprivileged attacker cannot initiate and which depends on a privileged actor unloading the module.\nPR:L - NBD_CMD_STATUS has no capability check and is usable by an unprivileged local user, so the cleanup race can be exercised without CAP_SYS_ADMIN; CAP_SYS_ADMIN in init_user_ns is only required for connect/disconnect/reconfigure.\nUI:N - No victim interaction is required; the attacker only needs to send netlink commands while the module exit path runs.\nS:U - Impact remains within the local kernel\u2019s authority; this is not a VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:H - The race is a use-after-free of nbd/debugfs/idr state during teardown, which can be leveraged for disclosure of freed kernel memory contents under the higher-severity UAF scoring rule.\nI:H - The same UAF on kernel objects during module cleanup can be abused for corruption/control-flow hijack primitives, not merely a crash.\nA:H - The documented outcome is a kernel NULL pointer dereference oops during nbd_genl_connect while the module is going away, which is a full availability impact."
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            },
            {
              "url": "https://git.kernel.org/stable/c/013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c"
            },
            {
              "url": "https://git.kernel.org/stable/c/1be608e1ee1f222464b2856bda9b85ab5184a33e"
            },
            {
              "url": "https://git.kernel.org/stable/c/c0868f6e728c3c28bef0e8bee89d2daf86a8bbca"
            },
            {
              "url": "https://git.kernel.org/stable/c/cbeafa7a79d08ecdb55f8f1d41a11323d0f709db"
            },
            {
              "url": "https://git.kernel.org/stable/c/6f505bbb8063fd3a238a4239d2d8c165e5279f6f"
            },
            {
              "url": "https://git.kernel.org/stable/c/3d5da1ffba3388c2ae2e6c598855a4d887d3bf79"
            },
            {
              "url": "https://git.kernel.org/stable/c/06c4da89c24e7023ea448cadf8e9daf06a0aae6e"
            }
          ],
          "title": "nbd: call genl_unregister_family() first in nbd_cleanup()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-49295",
        "datePublished": "2025-02-26T02:01:25.659Z",
        "dateReserved": "2025-02-26T01:49:39.302Z",
        "dateUpdated": "2026-08-05T08:54:41.429Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

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.



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.