CVE-2023-52922 (GCVE-0-2023-52922)

Vulnerability from cvelistv5 – Published: 2024-11-28 15:09 – Updated: 2026-08-05 09:12
VLAI
Title
can: bcm: Fix UAF in bcm_proc_show()
Summary
In the Linux kernel, the following vulnerability has been resolved: can: bcm: Fix UAF in bcm_proc_show() BUG: KASAN: slab-use-after-free in bcm_proc_show+0x969/0xa80 Read of size 8 at addr ffff888155846230 by task cat/7862 CPU: 1 PID: 7862 Comm: cat Not tainted 6.5.0-rc1-00153-gc8746099c197 #230 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0xd5/0x150 print_report+0xc1/0x5e0 kasan_report+0xba/0xf0 bcm_proc_show+0x969/0xa80 seq_read_iter+0x4f6/0x1260 seq_read+0x165/0x210 proc_reg_read+0x227/0x300 vfs_read+0x1d5/0x8d0 ksys_read+0x11e/0x240 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Allocated by task 7846: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x9e/0xa0 bcm_sendmsg+0x264b/0x44e0 sock_sendmsg+0xda/0x180 ____sys_sendmsg+0x735/0x920 ___sys_sendmsg+0x11d/0x1b0 __sys_sendmsg+0xfa/0x1d0 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 7846: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x27/0x40 ____kasan_slab_free+0x161/0x1c0 slab_free_freelist_hook+0x119/0x220 __kmem_cache_free+0xb4/0x2e0 rcu_core+0x809/0x1bd0 bcm_op is freed before procfs entry be removed in bcm_release(), this lead to bcm_proc_show() may read the freed bcm_op.
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 (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 11b8e27ed448baa385d90154a141466bd5e92f18 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ff (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < cf254b4f68e480e73dab055014e002b77aed30ed (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 3c3941bb1eb53abe7d640ffee5c4d6b559829ab3 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 995f47d76647708ec26c6e388663ad4f3f264787 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < dfd0aa26e9a07f2ce546ccf8304ead6a2914e8a7 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 55c3b96074f3f9b0aee19bf93cd71af7516582bb (git)
Create a notification for this product.
Linux Linux Affected: 2.6.25
Unaffected: 0 , < 2.6.25 (semver)
Unaffected: 4.14.322 , ≤ 4.14.* (semver)
Unaffected: 4.19.291 , ≤ 4.19.* (semver)
Unaffected: 5.4.251 , ≤ 5.4.* (semver)
Unaffected: 5.10.188 , ≤ 5.10.* (semver)
Unaffected: 5.15.123 , ≤ 5.15.* (semver)
Unaffected: 6.1.42 , ≤ 6.1.* (semver)
Unaffected: 6.4.7 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "value": "AV:L - The bug is reached via local syscalls\u2014socket(PF_CAN, SOCK_DGRAM, CAN_BCM), connect, sendmsg to create ops, read of /proc/net/can-bcm/\u003cino\u003e, and close\u2014not via remote packet processing.\nAC:L - The attacker fully controls both sides of the race by reading their own procfs entry while concurrently closing the BCM socket, so success does not depend on external timing or victim state.\nPR:L - can_create() imposes no capability check, the proc entry is mode 0644, and a CAN interface for TX_SETUP is obtainable via unprivileged user/net namespaces (vcan/vxcan with CAP_NET_ADMIN in the userns).\nUI:N - Exploitation is entirely self-contained; no other user needs to open a file, mount anything, or otherwise interact.\nS:U - Impact remains within the local kernel/OS authority\u2014a standard local privilege-escalation class UAF, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Use-after-free of bcm_op lets concurrent bcm_proc_show() read freed slab contents; demonstrated freelist-pointer and physmap leaks, and heap reclaim enables controlled disclosure of reclaimed object data.\nI:H - UAF of a linked bcm_op with attacker-controlled reclaim (e.g. sprayed list_head) yields corrupted kernel list traversal and write-capable primitives typical of slab UAFs, supporting integrity compromise and control-flow hijacking.\nA:H - UAF read of freed bcm_op causes kernel oops/GPF on bad pointers and can induce infinite list walks after reclaim, resulting in hard DoS."
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        "dateUpdated": "2026-08-05T09:12:02.475Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/11b8e27ed448baa385d90154a141466bd5e92f18"
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          "url": "https://git.kernel.org/stable/c/9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ff"
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          "url": "https://git.kernel.org/stable/c/55c3b96074f3f9b0aee19bf93cd71af7516582bb"
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      "title": "can: bcm: Fix UAF in bcm_proc_show()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52922",
    "datePublished": "2024-11-28T15:09:51.360Z",
    "dateReserved": "2024-08-21T06:07:11.018Z",
    "dateUpdated": "2026-08-05T09:12:02.475Z",
    "state": "PUBLISHED"
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entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nAllocated by task 7846:\\n kasan_save_stack+0x1e/0x40\\n kasan_set_track+0x21/0x30\\n __kasan_kmalloc+0x9e/0xa0\\n bcm_sendmsg+0x264b/0x44e0\\n sock_sendmsg+0xda/0x180\\n ____sys_sendmsg+0x735/0x920\\n ___sys_sendmsg+0x11d/0x1b0\\n __sys_sendmsg+0xfa/0x1d0\\n do_syscall_64+0x35/0xb0\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nFreed by task 7846:\\n kasan_save_stack+0x1e/0x40\\n kasan_set_track+0x21/0x30\\n kasan_save_free_info+0x27/0x40\\n ____kasan_slab_free+0x161/0x1c0\\n slab_free_freelist_hook+0x119/0x220\\n __kmem_cache_free+0xb4/0x2e0\\n rcu_core+0x809/0x1bd0\\n\\nbcm_op is freed before procfs entry be removed in bcm_release(),\\nthis lead to bcm_proc_show() may read the freed bcm_op.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: bcm: Fix UAF en bcm_proc_show() BUG: KASAN: slab-use-after-free en bcm_proc_show+0x969/0xa80 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff888155846230 por la tarea cat/7862 CPU: 1 PID: 7862 Comm: cat No contaminado 6.5.0-rc1-00153-gc8746099c197 #230 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Seguimiento de llamadas:  dump_stack_lvl+0xd5/0x150 print_report+0xc1/0x5e0 Asignado por la tarea 7846: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x9e/0xa0 bcm_sendmsg+0x264b/0x44e0 sock_sendmsg+0xda/0x180 ____sys_sendmsg+0x735/0x920 ___sys_sendmsg+0x11d/0x1b0 __sys_sendmsg+0xfa/0x1d0 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Liberado por la tarea 7846: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x27/0x40 ____kasan_slab_free+0x161/0x1c0 slab_free_freelist_hook+0x119/0x220 __kmem_cache_free+0xb4/0x2e0 rcu_core+0x809/0x1bd0 bcm_op se libera antes de que se elimine la entrada procfs en bcm_release(), esto lleva a que bcm_proc_show() pueda leer el bcm_op 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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-28T07:45:54+00:00",
      "cve": "CVE-2023-52922",
      "id": "CVE-2023-52922",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "1924",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: bcm: Fix UAF in bcm_proc_show()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-52922.json",
      "version": "3"
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\"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-12-11T14:25:19.812424Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-12-11T14:25:21.314Z\"}}], \"cna\": {\"title\": \"can: bcm: Fix UAF in bcm_proc_show()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The bug is reached via local syscalls\\u2014socket(PF_CAN, SOCK_DGRAM, CAN_BCM), connect, sendmsg to create ops, read of /proc/net/can-bcm/\u003cino\u003e, and close\\u2014not via remote packet processing.\\nAC:L - The attacker fully controls both sides of the race by reading their own procfs entry while concurrently closing the BCM socket, so success does not depend on external timing or victim state.\\nPR:L - can_create() imposes no capability check, the proc entry is mode 0644, and a CAN interface for TX_SETUP is obtainable via unprivileged user/net namespaces (vcan/vxcan with CAP_NET_ADMIN in the userns).\\nUI:N - Exploitation is entirely self-contained; no other user needs to open a file, mount anything, or otherwise interact.\\nS:U - Impact remains within the local kernel/OS authority\\u2014a standard local privilege-escalation class UAF, not a VM/IOMMU/sandbox boundary crossing.\\nC:H - Use-after-free of bcm_op lets concurrent bcm_proc_show() read freed slab contents; demonstrated freelist-pointer and physmap leaks, and heap reclaim enables controlled disclosure of reclaimed object data.\\nI:H - UAF of a linked bcm_op with attacker-controlled reclaim (e.g. sprayed list_head) yields corrupted kernel list traversal and write-capable primitives typical of slab UAFs, supporting integrity compromise and control-flow hijacking.\\nA:H - UAF read of freed bcm_op causes kernel oops/GPF on bad pointers and can induce infinite list walks after reclaim, resulting in hard DoS.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ffd980f976e7fd666c2e61bf8ab35107efd11828\", \"lessThan\": \"11b8e27ed448baa385d90154a141466bd5e92f18\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ffd980f976e7fd666c2e61bf8ab35107efd11828\", \"lessThan\": \"9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ff\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ffd980f976e7fd666c2e61bf8ab35107efd11828\", \"lessThan\": \"9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6\", \"versionType\": \"git\"}, {\"status\": \"affected\", 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\"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.25\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.25\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.322\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.291\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.251\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.123\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4.7\", \"versionType\": 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{\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncan: bcm: Fix UAF in bcm_proc_show()\\n\\nBUG: KASAN: slab-use-after-free in bcm_proc_show+0x969/0xa80\\nRead of size 8 at addr ffff888155846230 by task cat/7862\\n\\nCPU: 1 PID: 7862 Comm: cat Not tainted 6.5.0-rc1-00153-gc8746099c197 #230\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0xd5/0x150\\n print_report+0xc1/0x5e0\\n kasan_report+0xba/0xf0\\n bcm_proc_show+0x969/0xa80\\n seq_read_iter+0x4f6/0x1260\\n seq_read+0x165/0x210\\n proc_reg_read+0x227/0x300\\n vfs_read+0x1d5/0x8d0\\n ksys_read+0x11e/0x240\\n do_syscall_64+0x35/0xb0\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nAllocated by task 7846:\\n kasan_save_stack+0x1e/0x40\\n kasan_set_track+0x21/0x30\\n __kasan_kmalloc+0x9e/0xa0\\n bcm_sendmsg+0x264b/0x44e0\\n sock_sendmsg+0xda/0x180\\n ____sys_sendmsg+0x735/0x920\\n ___sys_sendmsg+0x11d/0x1b0\\n __sys_sendmsg+0xfa/0x1d0\\n do_syscall_64+0x35/0xb0\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nFreed by task 7846:\\n kasan_save_stack+0x1e/0x40\\n kasan_set_track+0x21/0x30\\n kasan_save_free_info+0x27/0x40\\n ____kasan_slab_free+0x161/0x1c0\\n slab_free_freelist_hook+0x119/0x220\\n __kmem_cache_free+0xb4/0x2e0\\n rcu_core+0x809/0x1bd0\\n\\nbcm_op is freed before procfs entry be removed in bcm_release(),\\nthis lead to bcm_proc_show() may read the freed bcm_op.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.322\", \"versionStartIncluding\": \"2.6.25\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.291\", \"versionStartIncluding\": \"2.6.25\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.251\", \"versionStartIncluding\": \"2.6.25\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.188\", \"versionStartIncluding\": \"2.6.25\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.123\", \"versionStartIncluding\": \"2.6.25\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.42\", \"versionStartIncluding\": \"2.6.25\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.7\", \"versionStartIncluding\": \"2.6.25\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"2.6.25\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T09:12:02.475Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52922\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T09:12:02.475Z\", \"dateReserved\": \"2024-08-21T06:07:11.018Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-11-28T15:09:51.360Z\", \"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.