CVE-2024-56615 (GCVE-0-2024-56615)

Vulnerability from cvelistv5 – Published: 2024-12-27 14:51 – Updated: 2026-05-11 20:55
VLAI
Title
bpf: fix OOB devmap writes when deleting elements
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: fix OOB devmap writes when deleting elements Jordy reported issue against XSKMAP which also applies to DEVMAP - the index used for accessing map entry, due to being a signed integer, causes the OOB writes. Fix is simple as changing the type from int to u32, however, when compared to XSKMAP case, one more thing needs to be addressed. When map is released from system via dev_map_free(), we iterate through all of the entries and an iterator variable is also an int, which implies OOB accesses. Again, change it to be u32. Example splat below: [ 160.724676] BUG: unable to handle page fault for address: ffffc8fc2c001000 [ 160.731662] #PF: supervisor read access in kernel mode [ 160.736876] #PF: error_code(0x0000) - not-present page [ 160.742095] PGD 0 P4D 0 [ 160.744678] Oops: Oops: 0000 [#1] PREEMPT SMP [ 160.749106] CPU: 1 UID: 0 PID: 520 Comm: kworker/u145:12 Not tainted 6.12.0-rc1+ #487 [ 160.757050] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [ 160.767642] Workqueue: events_unbound bpf_map_free_deferred [ 160.773308] RIP: 0010:dev_map_free+0x77/0x170 [ 160.777735] Code: 00 e8 fd 91 ed ff e8 b8 73 ed ff 41 83 7d 18 19 74 6e 41 8b 45 24 49 8b bd f8 00 00 00 31 db 85 c0 74 48 48 63 c3 48 8d 04 c7 <48> 8b 28 48 85 ed 74 30 48 8b 7d 18 48 85 ff 74 05 e8 b3 52 fa ff [ 160.796777] RSP: 0018:ffffc9000ee1fe38 EFLAGS: 00010202 [ 160.802086] RAX: ffffc8fc2c001000 RBX: 0000000080000000 RCX: 0000000000000024 [ 160.809331] RDX: 0000000000000000 RSI: 0000000000000024 RDI: ffffc9002c001000 [ 160.816576] RBP: 0000000000000000 R08: 0000000000000023 R09: 0000000000000001 [ 160.823823] R10: 0000000000000001 R11: 00000000000ee6b2 R12: dead000000000122 [ 160.831066] R13: ffff88810c928e00 R14: ffff8881002df405 R15: 0000000000000000 [ 160.838310] FS: 0000000000000000(0000) GS:ffff8897e0c40000(0000) knlGS:0000000000000000 [ 160.846528] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 160.852357] CR2: ffffc8fc2c001000 CR3: 0000000005c32006 CR4: 00000000007726f0 [ 160.859604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 160.866847] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 160.874092] PKRU: 55555554 [ 160.876847] Call Trace: [ 160.879338] <TASK> [ 160.881477] ? __die+0x20/0x60 [ 160.884586] ? page_fault_oops+0x15a/0x450 [ 160.888746] ? search_extable+0x22/0x30 [ 160.892647] ? search_bpf_extables+0x5f/0x80 [ 160.896988] ? exc_page_fault+0xa9/0x140 [ 160.900973] ? asm_exc_page_fault+0x22/0x30 [ 160.905232] ? dev_map_free+0x77/0x170 [ 160.909043] ? dev_map_free+0x58/0x170 [ 160.912857] bpf_map_free_deferred+0x51/0x90 [ 160.917196] process_one_work+0x142/0x370 [ 160.921272] worker_thread+0x29e/0x3b0 [ 160.925082] ? rescuer_thread+0x4b0/0x4b0 [ 160.929157] kthread+0xd4/0x110 [ 160.932355] ? kthread_park+0x80/0x80 [ 160.936079] ret_from_fork+0x2d/0x50 [ 160.943396] ? kthread_park+0x80/0x80 [ 160.950803] ret_from_fork_asm+0x11/0x20 [ 160.958482] </TASK>
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 20:01 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 546ac1ffb70d25b56c1126940e5ec639c4dd7413 , < 0f170e91d3063ca60baec4bd9f544faf3bfe29eb (git)
Affected: 546ac1ffb70d25b56c1126940e5ec639c4dd7413 , < 70f3de869865f9c3da0508a5ea29f6f4c1889057 (git)
Affected: 546ac1ffb70d25b56c1126940e5ec639c4dd7413 , < ad34306ac6836e5dd096b7d0ad4aa20cb7c8d9e5 (git)
Affected: 546ac1ffb70d25b56c1126940e5ec639c4dd7413 , < 98c03d05936d846073df8f550e9e8bf0dde1d77f (git)
Affected: 546ac1ffb70d25b56c1126940e5ec639c4dd7413 , < 8e858930695d3ebec423e85384c95427258c294f (git)
Affected: 546ac1ffb70d25b56c1126940e5ec639c4dd7413 , < 178e31df1fb3d9e0890eb471da16709cbc82edee (git)
Affected: 546ac1ffb70d25b56c1126940e5ec639c4dd7413 , < ab244dd7cf4c291f82faacdc50b45cc0f55b674d (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.66 , ≤ 6.6.* (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix OOB devmap writes when deleting elements\n\nJordy reported issue against XSKMAP which also applies to DEVMAP - the\nindex used for accessing map entry, due to being a signed integer,\ncauses the OOB writes. Fix is simple as changing the type from int to\nu32, however, when compared to XSKMAP case, one more thing needs to be\naddressed.\n\nWhen map is released from system via dev_map_free(), we iterate through\nall of the entries and an iterator variable is also an int, which\nimplies OOB accesses. Again, change it to be u32.\n\nExample splat below:\n\n[  160.724676] BUG: unable to handle page fault for address: ffffc8fc2c001000\n[  160.731662] #PF: supervisor read access in kernel mode\n[  160.736876] #PF: error_code(0x0000) - not-present page\n[  160.742095] PGD 0 P4D 0\n[  160.744678] Oops: Oops: 0000 [#1] PREEMPT SMP\n[  160.749106] CPU: 1 UID: 0 PID: 520 Comm: kworker/u145:12 Not tainted 6.12.0-rc1+ #487\n[  160.757050] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[  160.767642] Workqueue: events_unbound bpf_map_free_deferred\n[  160.773308] RIP: 0010:dev_map_free+0x77/0x170\n[  160.777735] Code: 00 e8 fd 91 ed ff e8 b8 73 ed ff 41 83 7d 18 19 74 6e 41 8b 45 24 49 8b bd f8 00 00 00 31 db 85 c0 74 48 48 63 c3 48 8d 04 c7 \u003c48\u003e 8b 28 48 85 ed 74 30 48 8b 7d 18 48 85 ff 74 05 e8 b3 52 fa ff\n[  160.796777] RSP: 0018:ffffc9000ee1fe38 EFLAGS: 00010202\n[  160.802086] RAX: ffffc8fc2c001000 RBX: 0000000080000000 RCX: 0000000000000024\n[  160.809331] RDX: 0000000000000000 RSI: 0000000000000024 RDI: ffffc9002c001000\n[  160.816576] RBP: 0000000000000000 R08: 0000000000000023 R09: 0000000000000001\n[  160.823823] R10: 0000000000000001 R11: 00000000000ee6b2 R12: dead000000000122\n[  160.831066] R13: ffff88810c928e00 R14: ffff8881002df405 R15: 0000000000000000\n[  160.838310] FS:  0000000000000000(0000) GS:ffff8897e0c40000(0000) knlGS:0000000000000000\n[  160.846528] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  160.852357] CR2: ffffc8fc2c001000 CR3: 0000000005c32006 CR4: 00000000007726f0\n[  160.859604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  160.866847] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[  160.874092] PKRU: 55555554\n[  160.876847] Call Trace:\n[  160.879338]  \u003cTASK\u003e\n[  160.881477]  ? __die+0x20/0x60\n[  160.884586]  ? page_fault_oops+0x15a/0x450\n[  160.888746]  ? search_extable+0x22/0x30\n[  160.892647]  ? search_bpf_extables+0x5f/0x80\n[  160.896988]  ? exc_page_fault+0xa9/0x140\n[  160.900973]  ? asm_exc_page_fault+0x22/0x30\n[  160.905232]  ? dev_map_free+0x77/0x170\n[  160.909043]  ? dev_map_free+0x58/0x170\n[  160.912857]  bpf_map_free_deferred+0x51/0x90\n[  160.917196]  process_one_work+0x142/0x370\n[  160.921272]  worker_thread+0x29e/0x3b0\n[  160.925082]  ? rescuer_thread+0x4b0/0x4b0\n[  160.929157]  kthread+0xd4/0x110\n[  160.932355]  ? kthread_park+0x80/0x80\n[  160.936079]  ret_from_fork+0x2d/0x50\n[  160.943396]  ? kthread_park+0x80/0x80\n[  160.950803]  ret_from_fork_asm+0x11/0x20\n[  160.958482]  \u003c/TASK\u003e"
        }
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        "dateUpdated": "2026-05-11T20:55:53.439Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f170e91d3063ca60baec4bd9f544faf3bfe29eb"
        },
        {
          "url": "https://git.kernel.org/stable/c/70f3de869865f9c3da0508a5ea29f6f4c1889057"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad34306ac6836e5dd096b7d0ad4aa20cb7c8d9e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/98c03d05936d846073df8f550e9e8bf0dde1d77f"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e858930695d3ebec423e85384c95427258c294f"
        },
        {
          "url": "https://git.kernel.org/stable/c/178e31df1fb3d9e0890eb471da16709cbc82edee"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab244dd7cf4c291f82faacdc50b45cc0f55b674d"
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      ],
      "title": "bpf: fix OOB devmap writes when deleting elements",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56615",
    "datePublished": "2024-12-27T14:51:20.206Z",
    "dateReserved": "2024-12-27T14:03:06.014Z",
    "dateUpdated": "2026-05-11T20:55:53.439Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-56615",
      "date": "2026-11-07",
      "epss": "0.00257",
      "percentile": "0.17487"
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-18T02:09:12.000Z",
      "cve": "CVE-2024-56615",
      "id": "msrc_CVE-2024-56615",
      "initial_release_date": "2024-12-02T00:00:00.000Z",
      "product_status:fixed": "4",
      "product_status:known_affected": "4",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "bpf: fix OOB devmap writes when deleting elements",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-56615.json",
      "version": "3"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix OOB devmap writes when deleting elements\n\nJordy reported issue against XSKMAP which also applies to DEVMAP - the\nindex used for accessing map entry, due to being a signed integer,\ncauses the OOB writes. Fix is simple as changing the type from int to\nu32, however, when compared to XSKMAP case, one more thing needs to be\naddressed.\n\nWhen map is released from system via dev_map_free(), we iterate through\nall of the entries and an iterator variable is also an int, which\nimplies OOB accesses. Again, change it to be u32.\n\nExample splat below:\n\n[  160.724676] BUG: unable to handle page fault for address: ffffc8fc2c001000\n[  160.731662] #PF: supervisor read access in kernel mode\n[  160.736876] #PF: error_code(0x0000) - not-present page\n[  160.742095] PGD 0 P4D 0\n[  160.744678] Oops: Oops: 0000 [#1] PREEMPT SMP\n[  160.749106] CPU: 1 UID: 0 PID: 520 Comm: kworker/u145:12 Not tainted 6.12.0-rc1+ #487\n[  160.757050] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[  160.767642] Workqueue: events_unbound bpf_map_free_deferred\n[  160.773308] RIP: 0010:dev_map_free+0x77/0x170\n[  160.777735] Code: 00 e8 fd 91 ed ff e8 b8 73 ed ff 41 83 7d 18 19 74 6e 41 8b 45 24 49 8b bd f8 00 00 00 31 db 85 c0 74 48 48 63 c3 48 8d 04 c7 \u003c48\u003e 8b 28 48 85 ed 74 30 48 8b 7d 18 48 85 ff 74 05 e8 b3 52 fa ff\n[  160.796777] RSP: 0018:ffffc9000ee1fe38 EFLAGS: 00010202\n[  160.802086] RAX: ffffc8fc2c001000 RBX: 0000000080000000 RCX: 0000000000000024\n[  160.809331] RDX: 0000000000000000 RSI: 0000000000000024 RDI: ffffc9002c001000\n[  160.816576] RBP: 0000000000000000 R08: 0000000000000023 R09: 0000000000000001\n[  160.823823] R10: 0000000000000001 R11: 00000000000ee6b2 R12: dead000000000122\n[  160.831066] R13: ffff88810c928e00 R14: ffff8881002df405 R15: 0000000000000000\n[  160.838310] FS:  0000000000000000(0000) GS:ffff8897e0c40000(0000) knlGS:0000000000000000\n[  160.846528] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  160.852357] CR2: ffffc8fc2c001000 CR3: 0000000005c32006 CR4: 00000000007726f0\n[  160.859604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  160.866847] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[  160.874092] PKRU: 55555554\n[  160.876847] Call Trace:\n[  160.879338]  \u003cTASK\u003e\n[  160.881477]  ? __die+0x20/0x60\n[  160.884586]  ? page_fault_oops+0x15a/0x450\n[  160.888746]  ? search_extable+0x22/0x30\n[  160.892647]  ? search_bpf_extables+0x5f/0x80\n[  160.896988]  ? exc_page_fault+0xa9/0x140\n[  160.900973]  ? asm_exc_page_fault+0x22/0x30\n[  160.905232]  ? dev_map_free+0x77/0x170\n[  160.909043]  ? dev_map_free+0x58/0x170\n[  160.912857]  bpf_map_free_deferred+0x51/0x90\n[  160.917196]  process_one_work+0x142/0x370\n[  160.921272]  worker_thread+0x29e/0x3b0\n[  160.925082]  ? rescuer_thread+0x4b0/0x4b0\n[  160.929157]  kthread+0xd4/0x110\n[  160.932355]  ? kthread_park+0x80/0x80\n[  160.936079]  ret_from_fork+0x2d/0x50\n[  160.943396]  ? kthread_park+0x80/0x80\n[  160.950803]  ret_from_fork_asm+0x11/0x20\n[  160.958482]  \u003c/TASK\u003e"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: arregla las escrituras OOB de devmap al eliminar elementos Jordy inform\u00f3 un problema contra XSKMAP que tambi\u00e9n se aplica a DEVMAP: el \u00edndice utilizado para acceder a la entrada del mapa, debido a que es un entero con signo, provoca las escrituras OOB. La soluci\u00f3n es tan simple como cambiar el tipo de int a u32, sin embargo, en comparaci\u00f3n con el caso de XSKMAP, hay que abordar una cosa m\u00e1s. Cuando el mapa se libera del sistema a trav\u00e9s de dev_map_free(), iteramos a trav\u00e9s de todas las entradas y una variable de iterador tambi\u00e9n es un int, lo que implica accesos OOB. Nuevamente, c\u00e1mbielo a u32. Ejemplo de splat a continuaci\u00f3n: [ 160.724676] ERROR: no se puede gestionar el error de p\u00e1gina para la direcci\u00f3n: ffffc8fc2c001000 [ 160.731662] #PF: acceso de lectura del supervisor en modo kernel [ 160.736876] #PF: error_code(0x0000) - p\u00e1gina no presente [ 160.742095] PGD 0 P4D 0 [ 160.744678] Oops: Oops: 0000 [#1] PREEMPT SMP [ 160.749106] CPU: 1 UID: 0 PID: 520 Comm: kworker/u145:12 No contaminado 6.12.0-rc1+ #487 [ 160.757050] Nombre del hardware: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 19/03/2019 [ 160.767642] Cola de trabajo: events_unbound bpf_map_free_deferred [ 160.773308] RIP: 0010:dev_map_free+0x77/0x170 [ 160.777735] C\u00f3digo: 00 e8 fd 91 ed ff e8 b8 73 ed ff 41 83 7d 18 19 74 6e 41 8b 45 24 49 8b bd f8 00 00 00 31 db 85 c0 74 48 48 63 c3 48 8d 04 c7 \u0026lt;48\u0026gt; 8b 28 48 85 ed 74 30 48 8b 7d 18 48 85 ff 74 05 e8 b3 52 fa ff [ 160.796777] RSP: 0018:ffffc9000ee1fe38 EFLAGS: 00010202 [ 160.802086] RAX: ffffc8fc2c001000 RBX: 0000000080000000 RCX: 00000000000000024 [ 160.809331] RDX: 0000000000000000 RSI: 00000000000000024 RDI: ffffc9002c001000 [ 160.816576] RBP: 0000000000000000 R08: 0000000000000023 R09: 0000000000000001 [ 160.823823] R10: 000000000000001 R11: 00000000000ee6b2 R12: muerto000000000122 [ 160.831066] R13: ffff88810c928e00 R14: ffff8881002df405 R15: 0000000000000000 [ 160.838310] FS: 0000000000000000(0000) GS:ffff8897e0c40000(0000) knlGS:0000000000000000 [ 160.846528] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 160.852357] CR2: ffffc8fc2c001000 CR3: 0000000005c32006 CR4: 00000000007726f0 [ 160.859604] DR0: 00000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 160.866847] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 160.874092] PKRU: 55555554 [ 160.876847] Rastreo de llamadas: [ 160.879338]  [ 160.881477] ? __die+0x20/0x60 [ 160.884586] ? exc_page_fault+0xa9/0x140 [ 160.900973] ? asm_exc_page_fault+0x22/0x30 [ 160.905232] ? dev_map_free+0x77/0x170 [ 160.909043] ? dev_map_free+0x58/0x170 [ 160.912857] bpf_map_free_deferred+0x51/0x90 [ 160.917196] process_one_work+0x142/0x370 [ 160.921272] subproceso_trabajador+0x29e/0x3b0 [ 160.925082] ? subproceso_rescatador+0x4b0/0x4b0 [ 160.929157] kthread+0xd4/0x110 [ 160.932355] ? kthread_park+0x80/0x80 [ 160.936079] ret_from_fork+0x2d/0x50 [ 160.943396] ? kthread_park+0x80/0x80 [ 160.950803] ret_desde_fork_asm+0x11/0x20 [ 160.958482] "
          }
        ],
        "id": "CVE-2024-56615",
        "lastModified": "2026-06-17T08:12:33.377",
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                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.66",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.287",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.231",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.174",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.120",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.66",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.5",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.13",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix OOB devmap writes when deleting elements\n\nJordy reported issue against XSKMAP which also applies to DEVMAP - the\nindex used for accessing map entry, due to being a signed integer,\ncauses the OOB writes. Fix is simple as changing the type from int to\nu32, however, when compared to XSKMAP case, one more thing needs to be\naddressed.\n\nWhen map is released from system via dev_map_free(), we iterate through\nall of the entries and an iterator variable is also an int, which\nimplies OOB accesses. Again, change it to be u32.\n\nExample splat below:\n\n[  160.724676] BUG: unable to handle page fault for address: ffffc8fc2c001000\n[  160.731662] #PF: supervisor read access in kernel mode\n[  160.736876] #PF: error_code(0x0000) - not-present page\n[  160.742095] PGD 0 P4D 0\n[  160.744678] Oops: Oops: 0000 [#1] PREEMPT SMP\n[  160.749106] CPU: 1 UID: 0 PID: 520 Comm: kworker/u145:12 Not tainted 6.12.0-rc1+ #487\n[  160.757050] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[  160.767642] Workqueue: events_unbound bpf_map_free_deferred\n[  160.773308] RIP: 0010:dev_map_free+0x77/0x170\n[  160.777735] Code: 00 e8 fd 91 ed ff e8 b8 73 ed ff 41 83 7d 18 19 74 6e 41 8b 45 24 49 8b bd f8 00 00 00 31 db 85 c0 74 48 48 63 c3 48 8d 04 c7 \u003c48\u003e 8b 28 48 85 ed 74 30 48 8b 7d 18 48 85 ff 74 05 e8 b3 52 fa ff\n[  160.796777] RSP: 0018:ffffc9000ee1fe38 EFLAGS: 00010202\n[  160.802086] RAX: ffffc8fc2c001000 RBX: 0000000080000000 RCX: 0000000000000024\n[  160.809331] RDX: 0000000000000000 RSI: 0000000000000024 RDI: ffffc9002c001000\n[  160.816576] RBP: 0000000000000000 R08: 0000000000000023 R09: 0000000000000001\n[  160.823823] R10: 0000000000000001 R11: 00000000000ee6b2 R12: dead000000000122\n[  160.831066] R13: ffff88810c928e00 R14: ffff8881002df405 R15: 0000000000000000\n[  160.838310] FS:  0000000000000000(0000) GS:ffff8897e0c40000(0000) knlGS:0000000000000000\n[  160.846528] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  160.852357] CR2: ffffc8fc2c001000 CR3: 0000000005c32006 CR4: 00000000007726f0\n[  160.859604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  160.866847] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[  160.874092] PKRU: 55555554\n[  160.876847] Call Trace:\n[  160.879338]  \u003cTASK\u003e\n[  160.881477]  ? __die+0x20/0x60\n[  160.884586]  ? page_fault_oops+0x15a/0x450\n[  160.888746]  ? search_extable+0x22/0x30\n[  160.892647]  ? search_bpf_extables+0x5f/0x80\n[  160.896988]  ? exc_page_fault+0xa9/0x140\n[  160.900973]  ? asm_exc_page_fault+0x22/0x30\n[  160.905232]  ? dev_map_free+0x77/0x170\n[  160.909043]  ? dev_map_free+0x58/0x170\n[  160.912857]  bpf_map_free_deferred+0x51/0x90\n[  160.917196]  process_one_work+0x142/0x370\n[  160.921272]  worker_thread+0x29e/0x3b0\n[  160.925082]  ? rescuer_thread+0x4b0/0x4b0\n[  160.929157]  kthread+0xd4/0x110\n[  160.932355]  ? kthread_park+0x80/0x80\n[  160.936079]  ret_from_fork+0x2d/0x50\n[  160.943396]  ? kthread_park+0x80/0x80\n[  160.950803]  ret_from_fork_asm+0x11/0x20\n[  160.958482]  \u003c/TASK\u003e"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-05-04T09:59:56.222Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/0f170e91d3063ca60baec4bd9f544faf3bfe29eb"
            },
            {
              "url": "https://git.kernel.org/stable/c/70f3de869865f9c3da0508a5ea29f6f4c1889057"
            },
            {
              "url": "https://git.kernel.org/stable/c/ad34306ac6836e5dd096b7d0ad4aa20cb7c8d9e5"
            },
            {
              "url": "https://git.kernel.org/stable/c/98c03d05936d846073df8f550e9e8bf0dde1d77f"
            },
            {
              "url": "https://git.kernel.org/stable/c/8e858930695d3ebec423e85384c95427258c294f"
            },
            {
              "url": "https://git.kernel.org/stable/c/178e31df1fb3d9e0890eb471da16709cbc82edee"
            },
            {
              "url": "https://git.kernel.org/stable/c/ab244dd7cf4c291f82faacdc50b45cc0f55b674d"
            }
          ],
          "title": "bpf: fix OOB devmap writes when deleting elements",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-56615",
        "datePublished": "2024-12-27T14:51:20.206Z",
        "dateReserved": "2024-12-27T14:03:06.014Z",
        "dateUpdated": "2025-11-03T20:51:02.480Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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