{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()\n\nTwo latent bugs in the Text-phase handler, both present since the\noriginal LIO integration in commit e48354ce078c (\"iscsi-target: Add\niSCSI fabric support for target v4.1\"):\n\n1) DataDigest CRC buffer overread (4 bytes past text_in).\n\n text_in is kzalloc()'d at ALIGN(payload_length, 4). rx_size is then\n incremented by ISCSI_CRC_LEN to make room for the received DataDigest\n in the iovec, but the same (now-bumped) rx_size is passed as the\n buffer length to iscsit_crc_buf():\n\n if (conn->conn_ops->DataDigest) {\n ...\n rx_size += ISCSI_CRC_LEN;\n }\n ...\n if (conn->conn_ops->DataDigest) {\n data_crc = iscsit_crc_buf(text_in, rx_size, 0, NULL);\n\n iscsit_crc_buf() walks rx_size bytes of text_in with crc32c(), so\n when DataDigest is negotiated it reads 4 bytes past the end of the\n text_in allocation. KASAN reproduces this directly on the unpatched\n mainline tree as slab-out-of-bounds in crc32c() called from the Text\n PDU path. The OOB bytes feed crc32c() and are then compared against\n the initiator-supplied checksum, so the value does not flow back to\n the attacker, but the kernel does read past the buffer on every Text\n PDU with DataDigest=CRC32C.\n\n Fix by passing the actual padded payload length\n (ALIGN(payload_length, 4)) that was used for the kzalloc().\n\n2) Stale cmd->text_in_ptr re-free (double-free) on ERL>0 bad DataDigest\n drop.\n\n On DataDigest mismatch with ErrorRecoveryLevel > 0 the handler\n silently drops the PDU and lets the initiator plug the CmdSN gap:\n\n kfree(text_in);\n return 0;\n\n cmd->text_in_ptr still points at the freed buffer. The next Text\n Request on the same ITT re-enters iscsit_setup_text_cmd(), which\n unconditionally does\n\n kfree(cmd->text_in_ptr);\n cmd->text_in_ptr = NULL;\n\n freeing the same pointer a second time. Session teardown via\n iscsit_release_cmd() has the same shape and hits the same double-free\n if the connection is dropped before a second Text Request arrives.\n\n On an unmodified mainline tree the bug-1 CRC overread fires first on\n the initial valid Text Request and perturbs the subsequent state, so\n #4 was isolated by building a kernel with only the bug-1 hunk of this\n patch applied plus temporary printk() observability around the three\n relevant kfree() sites. The observability prints are not part of\n this patch. On that build, a three-PDU Text Request sequence after\n login produces two back-to-back splats:\n\n BUG: KASAN: double-free in iscsit_setup_text_cmd+0x??\n BUG: KASAN: double-free in iscsit_release_cmd+0x??\n\n showing the same pointer freed in the ERL>0 drop path and again in\n iscsit_setup_text_cmd() (next Text Request on the same ITT) and once\n more in iscsit_release_cmd() (session teardown). On distro kernels\n with CONFIG_SLAB_FREELIST_HARDENED=y (default) the double-free\n becomes a remote kernel BUG(); on non-hardened kernels it corrupts\n the slab freelist.\n\n Fix by clearing cmd->text_in_ptr after the kfree() in the ERL>0 drop\n path. With both hunks applied #4 is directly observable on the stock\n tree without observability printks; fixing bug-1 alone would mask #4\n less, not more, so the hunks are submitted together.\n\nBoth fixes are one-liners. The Text PDU state machine is unchanged and\nthe wire protocol is unaffected.", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63888" }, { "summary":"CVE-2026-63888 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-63888.json" }, { "summary":"openEuler-SA-2026-3303", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3303" }, { "summary":"CVE-2026-63888", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-63888&packageName=kernel" } ], "title":"openEuler cve CVE-2026-63888", "tracking":{ "initial_release_date":"2026-08-11T10:49:43+08:00", "revision_history":[ { "date":"2026-08-11T10:49:43+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-08-11T10:49:43+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-08-11T10:49:43+08:00", "id":"CVE-2026-63888", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"openEuler-22.03-LTS-SP4", "name":"openEuler-22.03-LTS-SP4" }, "name":"openEuler-22.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"bpftool-5.10.0-327.0.0.228.oe2203sp4.aarch64.rpm", "name":"bpftool-5.10.0-327.0.0.228.oe2203sp4.aarch64.rpm" }, "name":"bpftool-5.10.0-327.0.0.228.oe2203sp4.aarch64.rpm", "category":"product_version" }, { "product":{ "product_identification_helper":{ 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double-free in iscsit_handle_text_cmd()\n\nTwo latent bugs in the Text-phase handler, both present since the\noriginal LIO integration in commit e48354ce078c (\"iscsi-target: Add\niSCSI fabric support for target v4.1\"):\n\n1) DataDigest CRC buffer overread (4 bytes past text_in).\n\n text_in is kzalloc()'d at ALIGN(payload_length, 4). rx_size is then\n incremented by ISCSI_CRC_LEN to make room for the received DataDigest\n in the iovec, but the same (now-bumped) rx_size is passed as the\n buffer length to iscsit_crc_buf():\n\n if (conn->conn_ops->DataDigest) {\n ...\n rx_size += ISCSI_CRC_LEN;\n }\n ...\n if (conn->conn_ops->DataDigest) {\n data_crc = iscsit_crc_buf(text_in, rx_size, 0, NULL);\n\n iscsit_crc_buf() walks rx_size bytes of text_in with crc32c(), so\n when DataDigest is negotiated it reads 4 bytes past the end of the\n text_in allocation. KASAN reproduces this directly on the unpatched\n mainline tree as slab-out-of-bounds in crc32c() called from the Text\n PDU path. The OOB bytes feed crc32c() and are then compared against\n the initiator-supplied checksum, so the value does not flow back to\n the attacker, but the kernel does read past the buffer on every Text\n PDU with DataDigest=CRC32C.\n\n Fix by passing the actual padded payload length\n (ALIGN(payload_length, 4)) that was used for the kzalloc().\n\n2) Stale cmd->text_in_ptr re-free (double-free) on ERL>0 bad DataDigest\n drop.\n\n On DataDigest mismatch with ErrorRecoveryLevel > 0 the handler\n silently drops the PDU and lets the initiator plug the CmdSN gap:\n\n kfree(text_in);\n return 0;\n\n cmd->text_in_ptr still points at the freed buffer. The next Text\n Request on the same ITT re-enters iscsit_setup_text_cmd(), which\n unconditionally does\n\n kfree(cmd->text_in_ptr);\n cmd->text_in_ptr = NULL;\n\n freeing the same pointer a second time. Session teardown via\n iscsit_release_cmd() has the same shape and hits the same double-free\n if the connection is dropped before a second Text Request arrives.\n\n On an unmodified mainline tree the bug-1 CRC overread fires first on\n the initial valid Text Request and perturbs the subsequent state, so\n #4 was isolated by building a kernel with only the bug-1 hunk of this\n patch applied plus temporary printk() observability around the three\n relevant kfree() sites. The observability prints are not part of\n this patch. On that build, a three-PDU Text Request sequence after\n login produces two back-to-back splats:\n\n BUG: KASAN: double-free in iscsit_setup_text_cmd+0x??\n BUG: KASAN: double-free in iscsit_release_cmd+0x??\n\n showing the same pointer freed in the ERL>0 drop path and again in\n iscsit_setup_text_cmd() (next Text Request on the same ITT) and once\n more in iscsit_release_cmd() (session teardown). On distro kernels\n with CONFIG_SLAB_FREELIST_HARDENED=y (default) the double-free\n becomes a remote kernel BUG(); on non-hardened kernels it corrupts\n the slab freelist.\n\n Fix by clearing cmd->text_in_ptr after the kfree() in the ERL>0 drop\n path. With both hunks applied #4 is directly observable on the stock\n tree without observability printks; fixing bug-1 alone would mask #4\n less, not more, so the hunks are submitted together.\n\nBoth fixes are one-liners. The Text PDU state machine is unchanged and\nthe wire protocol is unaffected.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-327.0.0.228.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-327.0.0.228.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-327.0.0.228.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-327.0.0.228.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-327.0.0.228.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-327.0.0.228.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-327.0.0.228.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-source-5.10.0-327.0.0.228.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-tools-5.10.0-327.0.0.228.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-tools-debuginfo-5.10.0-327.0.0.228.oe2203sp4.aarch64", 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