CVE-2024-56631 (GCVE-0-2024-56631)

Vulnerability from cvelistv5 – Published: 2024-12-27 15:02 – Updated: 2026-07-14 12:38
VLAI
Title
scsi: sg: Fix slab-use-after-free read in sg_release()
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: sg: Fix slab-use-after-free read in sg_release() Fix a use-after-free bug in sg_release(), detected by syzbot with KASAN: BUG: KASAN: slab-use-after-free in lock_release+0x151/0xa30 kernel/locking/lockdep.c:5838 __mutex_unlock_slowpath+0xe2/0x750 kernel/locking/mutex.c:912 sg_release+0x1f4/0x2e0 drivers/scsi/sg.c:407 In sg_release(), the function kref_put(&sfp->f_ref, sg_remove_sfp) is called before releasing the open_rel_lock mutex. The kref_put() call may decrement the reference count of sfp to zero, triggering its cleanup through sg_remove_sfp(). This cleanup includes scheduling deferred work via sg_remove_sfp_usercontext(), which ultimately frees sfp. After kref_put(), sg_release() continues to unlock open_rel_lock and may reference sfp or sdp. If sfp has already been freed, this results in a slab-use-after-free error. Move the kref_put(&sfp->f_ref, sg_remove_sfp) call after unlocking the open_rel_lock mutex. This ensures: - No references to sfp or sdp occur after the reference count is decremented. - Cleanup functions such as sg_remove_sfp() and sg_remove_sfp_usercontext() can safely execute without impacting the mutex handling in sg_release(). The fix has been tested and validated by syzbot. This patch closes the bug reported at the following syzkaller link and ensures proper sequencing of resource cleanup and mutex operations, eliminating the risk of use-after-free errors in sg_release().
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: cc833acbee9db5ca8c6162b015b4c93863c6f821 , < e19acb1926c4a1f30ee1ec84d8afba2d975bd534 (git)
Affected: cc833acbee9db5ca8c6162b015b4c93863c6f821 , < 285ce1f89f8d414e7eecab5ef5118cd512596318 (git)
Affected: cc833acbee9db5ca8c6162b015b4c93863c6f821 , < 198b89dd5a595ee3f96e5ce5c448b0484cd0e53c (git)
Affected: cc833acbee9db5ca8c6162b015b4c93863c6f821 , < 275b8347e21ab8193e93223a8394a806e4ba8918 (git)
Affected: cc833acbee9db5ca8c6162b015b4c93863c6f821 , < 59b30afa578637169e2819536bb66459fdddc39d (git)
Affected: cc833acbee9db5ca8c6162b015b4c93863c6f821 , < 1f5e2f1ca5875728fcf62bc1a054707444ab4960 (git)
Affected: cc833acbee9db5ca8c6162b015b4c93863c6f821 , < f10593ad9bc36921f623361c9e3dd96bd52d85ee (git)
Affected: 3a27c0defb0315760100f8b1adc7c4acbe04c884 (git)
Affected: 3.16.85 , < 3.17 (semver)
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Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 5.4.290 , ≤ 5.4.* (semver)
Unaffected: 5.10.234 , ≤ 5.10.* (semver)
Unaffected: 5.15.177 , ≤ 5.15.* (semver)
Unaffected: 6.1.127 , ≤ 6.1.* (semver)
Unaffected: 6.6.66 , ≤ 6.6.* (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Show details on NVD website
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      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-18T01:39:45.000Z",
      "cve": "CVE-2024-56631",
      "id": "msrc_CVE-2024-56631",
      "initial_release_date": "2024-12-02T00:00:00.000Z",
      "product_status:fixed": "5",
      "product_status:known_affected": "5",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "scsi: sg: Fix slab-use-after-free read in sg_release()",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-56631.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-56631\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T15:15:22.690\",\"lastModified\":\"2026-07-14T13:17:13.187\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nscsi: sg: Fix slab-use-after-free read in sg_release()\\n\\nFix a use-after-free bug in sg_release(), detected by syzbot with KASAN:\\n\\nBUG: KASAN: slab-use-after-free in lock_release+0x151/0xa30\\nkernel/locking/lockdep.c:5838\\n__mutex_unlock_slowpath+0xe2/0x750 kernel/locking/mutex.c:912\\nsg_release+0x1f4/0x2e0 drivers/scsi/sg.c:407\\n\\nIn sg_release(), the function kref_put(\u0026sfp-\u003ef_ref, sg_remove_sfp) is\\ncalled before releasing the open_rel_lock mutex. The kref_put() call may\\ndecrement the reference count of sfp to zero, triggering its cleanup\\nthrough sg_remove_sfp(). This cleanup includes scheduling deferred work\\nvia sg_remove_sfp_usercontext(), which ultimately frees sfp.\\n\\nAfter kref_put(), sg_release() continues to unlock open_rel_lock and may\\nreference sfp or sdp. If sfp has already been freed, this results in a\\nslab-use-after-free error.\\n\\nMove the kref_put(\u0026sfp-\u003ef_ref, sg_remove_sfp) call after unlocking the\\nopen_rel_lock mutex. This ensures:\\n\\n - No references to sfp or sdp occur after the reference count is\\n   decremented.\\n\\n - Cleanup functions such as sg_remove_sfp() and\\n   sg_remove_sfp_usercontext() can safely execute without impacting the\\n   mutex handling in sg_release().\\n\\nThe fix has been tested and validated by syzbot. This patch closes the\\nbug reported at the following syzkaller link and ensures proper\\nsequencing of resource cleanup and mutex operations, eliminating the\\nrisk of use-after-free errors in sg_release().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nvme-tcp: corrige la fuga de memoria cuando falla la creaci\u00f3n de un nuevo control Ahora, aunque falla la creaci\u00f3n de un nuevo control, no hemos liberado el conjunto de etiquetas ocupado por admin_q, aqu\u00ed intentamos solucionarlo.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/scsi/sg.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"cc833acbee9db5ca8c6162b015b4c93863c6f821\",\"lessThan\":\"e19acb1926c4a1f30ee1ec84d8afba2d975bd534\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc833acbee9db5ca8c6162b015b4c93863c6f821\",\"lessThan\":\"285ce1f89f8d414e7eecab5ef5118cd512596318\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc833acbee9db5ca8c6162b015b4c93863c6f821\",\"lessThan\":\"198b89dd5a595ee3f96e5ce5c448b0484cd0e53c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc833acbee9db5ca8c6162b015b4c93863c6f821\",\"lessThan\":\"275b8347e21ab8193e93223a8394a806e4ba8918\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc833acbee9db5ca8c6162b015b4c93863c6f821\",\"lessThan\":\"59b30afa578637169e2819536bb66459fdddc39d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc833acbee9db5ca8c6162b015b4c93863c6f821\",\"lessThan\":\"1f5e2f1ca5875728fcf62bc1a054707444ab4960\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc833acbee9db5ca8c6162b015b4c93863c6f821\",\"lessThan\":\"f10593ad9bc36921f623361c9e3dd96bd52d85ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3a27c0defb0315760100f8b1adc7c4acbe04c884\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3.16.85\",\"lessThan\":\"3.17\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/scsi/sg.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.290\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.234\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.177\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.127\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.66\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.5\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 TM MFP - 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      "cve": "CVE-2024-56631",
      "id": "CVE-2024-56631",
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      "product_status:fixed": "305",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: sg: Fix slab-use-after-free read in sg_release()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56631.json",
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      "product_status:known_not_affected": "42",
      "product_status:recommended": "766",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-56631",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-56631.json",
      "version": "78"
    },
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\"version\": \"6.12.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/scsi/sg.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e19acb1926c4a1f30ee1ec84d8afba2d975bd534\"}, {\"url\": \"https://git.kernel.org/stable/c/285ce1f89f8d414e7eecab5ef5118cd512596318\"}, {\"url\": \"https://git.kernel.org/stable/c/198b89dd5a595ee3f96e5ce5c448b0484cd0e53c\"}, {\"url\": \"https://git.kernel.org/stable/c/275b8347e21ab8193e93223a8394a806e4ba8918\"}, {\"url\": \"https://git.kernel.org/stable/c/59b30afa578637169e2819536bb66459fdddc39d\"}, {\"url\": \"https://git.kernel.org/stable/c/1f5e2f1ca5875728fcf62bc1a054707444ab4960\"}, {\"url\": \"https://git.kernel.org/stable/c/f10593ad9bc36921f623361c9e3dd96bd52d85ee\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nscsi: sg: Fix slab-use-after-free read in sg_release()\\n\\nFix a use-after-free bug in sg_release(), detected by syzbot with KASAN:\\n\\nBUG: KASAN: slab-use-after-free in lock_release+0x151/0xa30\\nkernel/locking/lockdep.c:5838\\n__mutex_unlock_slowpath+0xe2/0x750 kernel/locking/mutex.c:912\\nsg_release+0x1f4/0x2e0 drivers/scsi/sg.c:407\\n\\nIn sg_release(), the function kref_put(\u0026sfp-\u003ef_ref, sg_remove_sfp) is\\ncalled before releasing the open_rel_lock mutex. The kref_put() call may\\ndecrement the reference count of sfp to zero, triggering its cleanup\\nthrough sg_remove_sfp(). This cleanup includes scheduling deferred work\\nvia sg_remove_sfp_usercontext(), which ultimately frees sfp.\\n\\nAfter kref_put(), sg_release() continues to unlock open_rel_lock and may\\nreference sfp or sdp. If sfp has already been freed, this results in a\\nslab-use-after-free error.\\n\\nMove the kref_put(\u0026sfp-\u003ef_ref, sg_remove_sfp) call after unlocking the\\nopen_rel_lock mutex. This ensures:\\n\\n - No references to sfp or sdp occur after the reference count is\\n   decremented.\\n\\n - Cleanup functions such as sg_remove_sfp() and\\n   sg_remove_sfp_usercontext() can safely execute without impacting the\\n   mutex handling in sg_release().\\n\\nThe fix has been tested and validated by syzbot. This patch closes the\\nbug reported at the following syzkaller link and ensures proper\\nsequencing of resource cleanup and mutex operations, eliminating the\\nrisk of use-after-free errors in sg_release().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.290\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.234\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.177\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.127\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.66\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.5\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.16.85\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:55:41.795Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-56631\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-14T12:38:37.830Z\", \"dateReserved\": \"2024-12-27T15:00:39.838Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-12-27T15:02:29.428Z\", \"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.