CVE-2021-46963 (GCVE-0-2021-46963)
Vulnerability from cvelistv5
Published
2024-02-27 18:47
Modified
2026-08-05 08:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix crash in qla2xxx_mqueuecommand() RIP: 0010:kmem_cache_free+0xfa/0x1b0 Call Trace: qla2xxx_mqueuecommand+0x2b5/0x2c0 [qla2xxx] scsi_queue_rq+0x5e2/0xa40 __blk_mq_try_issue_directly+0x128/0x1d0 blk_mq_request_issue_directly+0x4e/0xb0 Fix incorrect call to free srb in qla2xxx_mqueuecommand(), as srb is now allocated by upper layers. This fixes smatch warning of srb unintended free.
References
Impacted products
Vendor Product Version
Linux Linux Version: 64a8c5018a4b21b04a756a56c495ef47c14e92d9
Version: dea6ee7173039d489977c9ed92e3749154615db4
Version: af2a0c51b1205327f55a7e82e530403ae1d42cbb
Version: af2a0c51b1205327f55a7e82e530403ae1d42cbb
Version: af2a0c51b1205327f55a7e82e530403ae1d42cbb
Version: af2a0c51b1205327f55a7e82e530403ae1d42cbb
Version: 4a1cc2f71bc57cf8dee6f58e7d2355a43aabb312
Version: 4.19.90   ≤
Version: 5.4.4   ≤
Version: 5.3.17   ≤
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The vulnerable path is qla2xxx_queuecommand \\u2192 qla2xxx_mqueuecommand on outbound initiator I/O through the SCSI/block stack, reachable by local reads/writes to qla2xxx-backed devices or filesystems, not by processing remote Fibre Channel or network packets.\\nAC:L - Once a qpair is offline (PCI EEH/FLR/reset recovery, a normal operational state on QLogic FC HBAs) or DIF I/O hits an unsupported qpair, any subsequent SCSI command deterministically takes the QLA_INTERFACE_ERROR path and performs the incorrect free with no race or layout dependency.\\nPR:L - Any unprivileged local user who can issue I/O to a mounted filesystem or block device backed by a qla2xxx HBA reaches queuecommand; no capabilities or init-namespace root are required.\\nUI:N - The attacker triggers the bug by performing their own I/O against already-attached qla2xxx storage; no separate victim mount, open, or confirmation is required.\\nS:U - Impact is confined to the host kernel privilege domain (crash or heap corruption via the SRB mempool); there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\\nC:H - When the SRB mempool is below min_nr (common with outstanding async fabric SRBs), mempool_free stores the embedded scsi_cmd_priv pointer; after scsi_done recycles the command this becomes a use-after-free that enables arbitrary kernel memory disclosure via heap reuse.\\nI:H - The same mempool-poisoning UAF returns a dangling/aliased srb_t to later qla2xxx_get_qpair_sp callers for fabric/IOCB work, yielding heap corruption and control-flow hijack primitives suitable for privilege escalation.\\nA:H - The reported failure is a kernel crash in kmem_cache_free from qla2xxx_mqueuecommand when the full mempool path frees the non-slab embedded SRB, which is full host availability impact.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"64a8c5018a4b21b04a756a56c495ef47c14e92d9\", \"lessThan\": \"c5ab9b67d8b061de74e2ca51bf787ee599bd7f89\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dea6ee7173039d489977c9ed92e3749154615db4\", \"lessThan\": \"77509a238547863040a42d57c72403f7d4c89a8f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"af2a0c51b1205327f55a7e82e530403ae1d42cbb\", \"lessThan\": \"702cdaa2c6283c135ef16d52e0e4e3c1005aa538\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"af2a0c51b1205327f55a7e82e530403ae1d42cbb\", \"lessThan\": \"80ef24175df2cba3860d0369d1c662b49ee2de56\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"af2a0c51b1205327f55a7e82e530403ae1d42cbb\", \"lessThan\": \"a73208e3244127ef9f2cdf24e4adb947aaa32053\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"af2a0c51b1205327f55a7e82e530403ae1d42cbb\", \"lessThan\": \"6641df81ab799f28a5d564f860233dd26cca0d93\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4a1cc2f71bc57cf8dee6f58e7d2355a43aabb312\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.19.90\", \"lessThan\": \"4.19.191\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.4\", \"lessThan\": \"5.4.118\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.3.17\", \"lessThan\": \"5.4\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/scsi/qla2xxx/qla_os.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.191\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.118\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.36\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.20\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/scsi/qla2xxx/qla_os.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c5ab9b67d8b061de74e2ca51bf787ee599bd7f89\"}, {\"url\": \"https://git.kernel.org/stable/c/77509a238547863040a42d57c72403f7d4c89a8f\"}, {\"url\": \"https://git.kernel.org/stable/c/702cdaa2c6283c135ef16d52e0e4e3c1005aa538\"}, {\"url\": \"https://git.kernel.org/stable/c/80ef24175df2cba3860d0369d1c662b49ee2de56\"}, {\"url\": \"https://git.kernel.org/stable/c/a73208e3244127ef9f2cdf24e4adb947aaa32053\"}, {\"url\": \"https://git.kernel.org/stable/c/6641df81ab799f28a5d564f860233dd26cca0d93\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nscsi: qla2xxx: Fix crash in qla2xxx_mqueuecommand()\\n\\n    RIP: 0010:kmem_cache_free+0xfa/0x1b0\\n    Call Trace:\\n       qla2xxx_mqueuecommand+0x2b5/0x2c0 [qla2xxx]\\n       scsi_queue_rq+0x5e2/0xa40\\n       __blk_mq_try_issue_directly+0x128/0x1d0\\n       blk_mq_request_issue_directly+0x4e/0xb0\\n\\nFix incorrect call to free srb in qla2xxx_mqueuecommand(), as srb is now\\nallocated by upper layers. This fixes smatch warning of srb unintended\\nfree.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.191\", \"versionStartIncluding\": \"4.19.90\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.118\", \"versionStartIncluding\": \"5.4.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.36\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.20\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.3\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.3.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:45:15.980Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46963\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:45:15.980Z\", \"dateReserved\": \"2024-02-27T18:42:55.942Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:47:01.783Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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