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CVE-2024-26638 (GCVE-0-2024-26638)

Vulnerability from cvelistv5 – Published: 2024-03-18 10:14 – Updated: 2026-05-11 20:01
VLAI
Title
nbd: always initialize struct msghdr completely
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: always initialize struct msghdr completely syzbot complains that msg->msg_get_inq value can be uninitialized [1] struct msghdr got many new fields recently, we should always make sure their values is zero by default. [1] BUG: KMSAN: uninit-value in tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571 tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571 inet_recvmsg+0x131/0x580 net/ipv4/af_inet.c:879 sock_recvmsg_nosec net/socket.c:1044 [inline] sock_recvmsg+0x12b/0x1e0 net/socket.c:1066 __sock_xmit+0x236/0x5c0 drivers/block/nbd.c:538 nbd_read_reply drivers/block/nbd.c:732 [inline] recv_work+0x262/0x3100 drivers/block/nbd.c:863 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700 worker_thread+0xf45/0x1490 kernel/workqueue.c:2781 kthread+0x3ed/0x540 kernel/kthread.c:388 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Local variable msg created at: __sock_xmit+0x4c/0x5c0 drivers/block/nbd.c:513 nbd_read_reply drivers/block/nbd.c:732 [inline] recv_work+0x262/0x3100 drivers/block/nbd.c:863 CPU: 1 PID: 7465 Comm: kworker/u5:1 Not tainted 6.7.0-rc7-syzkaller-00041-gf016f7547aee #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: nbd5-recv recv_work
Severity
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/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 2024-03-18 15:03 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60 , < d9c54763e5cdbbd3f81868597fe8aca3c96e6387 (git)
Affected: f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60 , < 1960f2b534da1e6c65fb96f9e98bda773495f406 (git)
Affected: f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60 , < b0028f333420a65a53a63978522db680b37379dd (git)
Affected: f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60 , < 78fbb92af27d0982634116c7a31065f24d092826 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.76 , ≤ 6.1.* (semver)
Unaffected: 6.6.15 , ≤ 6.6.* (semver)
Unaffected: 6.7.3 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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[1] ERROR: KMSAN: valor uninit en tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571 tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571 inet_recvmsg+0x131/0x580 net/ipv4/af_inet. c:879 sock_recvmsg_nosec net/socket.c:1044 [en l\u00ednea] sock_recvmsg+0x12b/0x1e0 net/socket.c:1066 __sock_xmit+0x236/0x5c0 drivers/block/nbd.c:538 nbd_read_reply drivers/block/nbd.c:732 [en l\u00ednea] recv_work+0x262/0x3100 drivers/block/nbd.c:863 Process_one_work kernel/workqueue.c:2627 [en l\u00ednea] Process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700 workqueue.c :2781 kthread+0x3ed/0x540 kernel/kthread.c:388 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Mensaje de variable local creado en: __sock_xmit+0x4c/0x5c0 drivers/block/nbd.c:513 nbd_read_reply drivers/block/nbd.c:732 [en l\u00ednea] recv_work+0x262/0x3100 drivers/block/nbd.c:863 CPU: 1 PID: 7465 Comm : kworker/u5:1 No contaminado 6.7.0-rc7-syzkaller-00041-gf016f7547aee #0 Nombre del 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      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T08:02:49+00:00",
      "cve": "CVE-2024-26638",
      "id": "CVE-2024-26638",
      "initial_release_date": "2024-03-18T00:00:00+00:00",
      "product_status:fixed": "679",
      "product_status:known_affected": "80",
      "product_status:known_not_affected": "8",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nbd: always initialize struct msghdr completely",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26638.json",
      "version": "3"
    },
    "vulnrichment": {
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\"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"HIGH\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26638\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-03-18T15:03:09.857129Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:18.301Z\"}}], \"cna\": {\"title\": \"nbd: always initialize struct msghdr completely\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", 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process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700\\n  worker_thread+0xf45/0x1490 kernel/workqueue.c:2781\\n  kthread+0x3ed/0x540 kernel/kthread.c:388\\n  ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147\\n  ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242\\n\\nLocal variable msg created at:\\n  __sock_xmit+0x4c/0x5c0 drivers/block/nbd.c:513\\n  nbd_read_reply drivers/block/nbd.c:732 [inline]\\n  recv_work+0x262/0x3100 drivers/block/nbd.c:863\\n\\nCPU: 1 PID: 7465 Comm: kworker/u5:1 Not tainted 6.7.0-rc7-syzkaller-00041-gf016f7547aee #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023\\nWorkqueue: nbd5-recv recv_work\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.76\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", 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      "cveMetadata": "{\"cveId\": \"CVE-2024-26638\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:01:17.550Z\", \"dateReserved\": \"2024-02-19T14:20:24.137Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-18T10:14:48.970Z\", \"assignerShortName\": \"Linux\"}",
      "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.


Detection rules are retrieved from Rulezet.