CVE-2024-39508

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Source
https://nvd.nist.gov/vuln/detail/CVE-2024-39508
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-39508.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-39508
Downstream
Related
Published
2024-07-12T12:20:39Z
Modified
2025-10-21T23:21:37.776932Z
Summary
io_uring/io-wq: Use set_bit() and test_bit() at worker->flags
Details

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

iouring/io-wq: Use setbit() and test_bit() at worker->flags

Utilize setbit() and testbit() on worker->flags within io_uring/io-wq to address potential data races.

The structure ioworker->flags may be accessed through various data paths, leading to concurrency issues. When KCSAN is enabled, it reveals data races occurring in ioworkerhandlework and iowqactivatefreeworker functions.

 BUG: KCSAN: data-race in io_worker_handle_work / io_wq_activate_free_worker
 write to 0xffff8885c4246404 of 4 bytes by task 49071 on cpu 28:
 io_worker_handle_work (io_uring/io-wq.c:434 io_uring/io-wq.c:569)
 io_wq_worker (io_uring/io-wq.c:?)

<snip>

 read to 0xffff8885c4246404 of 4 bytes by task 49024 on cpu 5:
 io_wq_activate_free_worker (io_uring/io-wq.c:? io_uring/io-wq.c:285)
 io_wq_enqueue (io_uring/io-wq.c:947)
 io_queue_iowq (io_uring/io_uring.c:524)
 io_req_task_submit (io_uring/io_uring.c:1511)
 io_handle_tw_list (io_uring/io_uring.c:1198)

<snip>

Line numbers against commit 18daea77cca6 ("Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm").

These races involve writes and reads to the same memory location by different tasks running on different CPUs. To mitigate this, refactor the code to use atomic operations such as setbit(), testbit(), and clear_bit() instead of basic "and" and "or" operations. This ensures thread-safe manipulation of worker flags.

Also, move create_index to avoid holes in the structure.

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
2b188cc1bb857a9d4701ae59aa7768b5124e262e
Fixed
ab702c3483db9046bab9f40306f1a28b22dbbdc0
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
2b188cc1bb857a9d4701ae59aa7768b5124e262e
Fixed
1cbb0affb15470a9621267fe0a8568007553a4bf
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
2b188cc1bb857a9d4701ae59aa7768b5124e262e
Fixed
8a565304927fbd28c9f028c492b5c1714002cbab

Affected versions

v5.*

v5.0
v5.0-rc7
v5.0-rc8
v5.1
v5.1-rc1
v5.1-rc2
v5.1-rc3
v5.1-rc4
v5.1-rc5
v5.1-rc6
v5.1-rc7
v5.10
v5.10-rc1
v5.10-rc2
v5.10-rc3
v5.10-rc4
v5.10-rc5
v5.10-rc6
v5.10-rc7
v5.11
v5.11-rc1
v5.11-rc2
v5.11-rc3
v5.11-rc4
v5.11-rc5
v5.11-rc6
v5.11-rc7
v5.12
v5.12-rc1
v5.12-rc1-dontuse
v5.12-rc2
v5.12-rc3
v5.12-rc4
v5.12-rc5
v5.12-rc6
v5.12-rc7
v5.12-rc8
v5.13
v5.13-rc1
v5.13-rc2
v5.13-rc3
v5.13-rc4
v5.13-rc5
v5.13-rc6
v5.13-rc7
v5.14
v5.14-rc1
v5.14-rc2
v5.14-rc3
v5.14-rc4
v5.14-rc5
v5.14-rc6
v5.14-rc7
v5.15
v5.15-rc1
v5.15-rc2
v5.15-rc3
v5.15-rc4
v5.15-rc5
v5.15-rc6
v5.15-rc7
v5.16
v5.16-rc1
v5.16-rc2
v5.16-rc3
v5.16-rc4
v5.16-rc5
v5.16-rc6
v5.16-rc7
v5.16-rc8
v5.17
v5.17-rc1
v5.17-rc2
v5.17-rc3
v5.17-rc4
v5.17-rc5
v5.17-rc6
v5.17-rc7
v5.17-rc8
v5.18
v5.18-rc1
v5.18-rc2
v5.18-rc3
v5.18-rc4
v5.18-rc5
v5.18-rc6
v5.18-rc7
v5.19
v5.19-rc1
v5.19-rc2
v5.19-rc3
v5.19-rc4
v5.19-rc5
v5.19-rc6
v5.19-rc7
v5.19-rc8
v5.2
v5.2-rc1
v5.2-rc2
v5.2-rc3
v5.2-rc4
v5.2-rc5
v5.2-rc6
v5.2-rc7
v5.3
v5.3-rc1
v5.3-rc2
v5.3-rc3
v5.3-rc4
v5.3-rc5
v5.3-rc6
v5.3-rc7
v5.3-rc8
v5.4
v5.4-rc1
v5.4-rc2
v5.4-rc3
v5.4-rc4
v5.4-rc5
v5.4-rc6
v5.4-rc7
v5.4-rc8
v5.5
v5.5-rc1
v5.5-rc2
v5.5-rc3
v5.5-rc4
v5.5-rc5
v5.5-rc6
v5.5-rc7
v5.6
v5.6-rc1
v5.6-rc2
v5.6-rc3
v5.6-rc4
v5.6-rc5
v5.6-rc6
v5.6-rc7
v5.7
v5.7-rc1
v5.7-rc2
v5.7-rc3
v5.7-rc4
v5.7-rc5
v5.7-rc6
v5.7-rc7
v5.8
v5.8-rc1
v5.8-rc2
v5.8-rc3
v5.8-rc4
v5.8-rc5
v5.8-rc6
v5.8-rc7
v5.9
v5.9-rc1
v5.9-rc2
v5.9-rc3
v5.9-rc4
v5.9-rc5
v5.9-rc6
v5.9-rc7
v5.9-rc8

v6.*

v6.0
v6.0-rc1
v6.0-rc2
v6.0-rc3
v6.0-rc4
v6.0-rc5
v6.0-rc6
v6.0-rc7
v6.1
v6.1-rc1
v6.1-rc2
v6.1-rc3
v6.1-rc4
v6.1-rc5
v6.1-rc6
v6.1-rc7
v6.1-rc8
v6.2
v6.2-rc1
v6.2-rc2
v6.2-rc3
v6.2-rc4
v6.2-rc5
v6.2-rc6
v6.2-rc7
v6.2-rc8
v6.3
v6.3-rc1
v6.3-rc2
v6.3-rc3
v6.3-rc4
v6.3-rc5
v6.3-rc6
v6.3-rc7
v6.4
v6.4-rc1
v6.4-rc2
v6.4-rc3
v6.4-rc4
v6.4-rc5
v6.4-rc6
v6.4-rc7
v6.5
v6.5-rc1
v6.5-rc2
v6.5-rc3
v6.5-rc4
v6.5-rc5
v6.5-rc6
v6.5-rc7
v6.6
v6.6-rc1
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
v6.6.1
v6.6.10
v6.6.11
v6.6.12
v6.6.13
v6.6.14
v6.6.15
v6.6.16
v6.6.17
v6.6.18
v6.6.19
v6.6.2
v6.6.20
v6.6.21
v6.6.22
v6.6.23
v6.6.24
v6.6.25
v6.6.26
v6.6.27
v6.6.28
v6.6.29
v6.6.3
v6.6.30
v6.6.31
v6.6.32
v6.6.33
v6.6.34
v6.6.4
v6.6.5
v6.6.6
v6.6.7
v6.6.8
v6.6.9
v6.7
v6.7-rc1
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.9
v6.9-rc1
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7
v6.9.1
v6.9.2
v6.9.3
v6.9.4
v6.9.5

Database specific

vanir_signatures

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    {
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        "signature_version": "v1",
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        },
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        "signature_type": "Function",
        "digest": {
            "length": 918.0,
            "function_hash": "209408798478637511693839544105393019234"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1cbb0affb15470a9621267fe0a8568007553a4bf",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_wq_worker_running",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-52ecc875",
        "signature_type": "Function",
        "digest": {
            "length": 258.0,
            "function_hash": "145407770488646410119064020472478097967"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@8a565304927fbd28c9f028c492b5c1714002cbab",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_wq_dec_running",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-55044a4b",
        "signature_type": "Function",
        "digest": {
            "length": 393.0,
            "function_hash": "38689795226496298337753709906511013706"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1cbb0affb15470a9621267fe0a8568007553a4bf",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_worker_exit",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-56dddaee",
        "signature_type": "Function",
        "digest": {
            "length": 548.0,
            "function_hash": "208220269445597987093478847256007384152"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@8a565304927fbd28c9f028c492b5c1714002cbab",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_wq_get_acct",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-5aa99a72",
        "signature_type": "Function",
        "digest": {
            "length": 123.0,
            "function_hash": "21452442085413161947482358786773521000"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@8a565304927fbd28c9f028c492b5c1714002cbab",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_wq_worker_running",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-65509443",
        "signature_type": "Function",
        "digest": {
            "length": 258.0,
            "function_hash": "145407770488646410119064020472478097967"
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    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@8a565304927fbd28c9f028c492b5c1714002cbab",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "create_io_worker",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-6f3b6c23",
        "signature_type": "Function",
        "digest": {
            "length": 871.0,
            "function_hash": "62426176360332389052613423741883458714"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1cbb0affb15470a9621267fe0a8568007553a4bf",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_wq_get_acct",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-a66a773d",
        "signature_type": "Function",
        "digest": {
            "length": 123.0,
            "function_hash": "21452442085413161947482358786773521000"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1cbb0affb15470a9621267fe0a8568007553a4bf",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_wq_worker_sleeping",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-d06ef815",
        "signature_type": "Function",
        "digest": {
            "length": 265.0,
            "function_hash": "47313372506792566503373096174604712981"
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    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1cbb0affb15470a9621267fe0a8568007553a4bf",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_wq_worker",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-dbb5d76f",
        "signature_type": "Function",
        "digest": {
            "length": 1118.0,
            "function_hash": "288446281372766424380164209901732474060"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1cbb0affb15470a9621267fe0a8568007553a4bf",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_wq_enqueue",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-df0c52d0",
        "signature_type": "Function",
        "digest": {
            "length": 918.0,
            "function_hash": "209408798478637511693839544105393019234"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1cbb0affb15470a9621267fe0a8568007553a4bf",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_init_new_worker",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-e994c9d3",
        "signature_type": "Function",
        "digest": {
            "length": 411.0,
            "function_hash": "221977645479161012377616646145890051935"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@8a565304927fbd28c9f028c492b5c1714002cbab",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_init_new_worker",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-ecf455e8",
        "signature_type": "Function",
        "digest": {
            "length": 411.0,
            "function_hash": "221977645479161012377616646145890051935"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@8a565304927fbd28c9f028c492b5c1714002cbab",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "io_wq_worker_sleeping",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-ef528f83",
        "signature_type": "Function",
        "digest": {
            "length": 265.0,
            "function_hash": "47313372506792566503373096174604712981"
        }
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@8a565304927fbd28c9f028c492b5c1714002cbab",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "function": "__io_worker_busy",
            "file": "io_uring/io-wq.c"
        },
        "id": "CVE-2024-39508-fc866d1c",
        "signature_type": "Function",
        "digest": {
            "length": 241.0,
            "function_hash": "136394663678397634155209862535421318118"
        }
    }
]

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.1.0
Fixed
6.6.35
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.9.6