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CVE-2024-26731 (GCVE-0-2024-26731)

Vulnerability from cvelistv5 – Published: 2024-04-03 17:00 – Updated: 2026-05-23 15:37
VLAI
Title
bpf, sockmap: Fix NULL pointer dereference in sk_psock_verdict_data_ready()
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix NULL pointer dereference in sk_psock_verdict_data_ready() syzbot reported the following NULL pointer dereference issue [1]: BUG: kernel NULL pointer dereference, address: 0000000000000000 [...] RIP: 0010:0x0 [...] Call Trace: <TASK> sk_psock_verdict_data_ready+0x232/0x340 net/core/skmsg.c:1230 unix_stream_sendmsg+0x9b4/0x1230 net/unix/af_unix.c:2293 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 If sk_psock_verdict_data_ready() and sk_psock_stop_verdict() are called concurrently, psock->saved_data_ready can be NULL, causing the above issue. This patch fixes this issue by calling the appropriate data ready function using the sk_psock_data_ready() helper and protecting it from concurrency with sk->sk_callback_lock.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-03 18:10 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: dd628fc697ee59b76bd3877c4bd13f07ccc3776f , < 4588b13abcbd561ec67f5b3c1cb2eff690990a54 (git)
Affected: 6df7f764cd3cf5a03a4a47b23be47e57e41fcd85 , < 9b099ed46dcaf1403c531ff02c3d7400fa37fa26 (git)
Affected: 6df7f764cd3cf5a03a4a47b23be47e57e41fcd85 , < d61608a4e394f23e0dca099df9eb8e555453d949 (git)
Affected: 6df7f764cd3cf5a03a4a47b23be47e57e41fcd85 , < 4cd12c6065dfcdeba10f49949bffcf383b3952d8 (git)
Affected: d3cbd7c571446a876aefd8320500300b2c951c58 (git)
Affected: 6.1.32 , < 6.1.80 (semver)
Affected: 6.3.6 , < 6.4 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.1.80 , ≤ 6.1.* (semver)
Unaffected: 6.6.19 , ≤ 6.6.* (semver)
Unaffected: 6.7.7 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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Este parche soluciona este problema llamando a la funci\u00f3n de preparaci\u00f3n de datos adecuada utilizando el asistente sk_psock_data_ready() y protegi\u00e9ndola de la concurrencia con 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-05-11T21:33:05+00:00",
      "cve": "CVE-2024-26731",
      "id": "CVE-2024-26731",
      "initial_release_date": "2024-04-03T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf, sockmap: Fix NULL pointer dereference in sk_psock_verdict_data_ready()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26731.json",
      "version": "3"
    },
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net/socket.c:2584\\n   ___sys_sendmsg net/socket.c:2638 [inline]\\n   __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667\\n   do_syscall_64+0xf9/0x240\\n   entry_SYSCALL_64_after_hwframe+0x6f/0x77\\n\\nIf sk_psock_verdict_data_ready() and sk_psock_stop_verdict() are called\\nconcurrently, psock-\u003esaved_data_ready can be NULL, causing the above issue.\\n\\nThis patch fixes this issue by calling the appropriate data ready function\\nusing the sk_psock_data_ready() helper and protecting it from concurrency\\nwith sk-\u003esk_callback_lock.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.80\", \"versionStartIncluding\": \"6.1.32\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.19\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": 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      "cveMetadata": "{\"cveId\": \"CVE-2024-26731\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:03:03.348Z\", \"dateReserved\": \"2024-02-19T14:20:24.164Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T17:00:18.823Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
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    }
  }
}



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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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  • 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.


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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.