SUSE-SU-2026:4708-1

Vulnerability from csaf_suse - Published: 2026-10-16 13:41 - Updated: 2026-10-17 09:16
Summary
Security update for the Linux Kernel RT (Live Patch 19 for SUSE Linux Enterprise 15 SP7)
Severity
Important
Notes
Title of the patch: Security update for the Linux Kernel RT (Live Patch 19 for SUSE Linux Enterprise 15 SP7)
Description of the patch: This update for the SUSE Linux Enterprise Kernel 6.4.0-150700.7.72 fixes various security issues: The following security issues were fixed: - CVE-2026-63887: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (bsc#1272386). - CVE-2026-68158: libceph: Fix multiplication overflow in decode_new_up_state_weight() (bsc#1276303).
Patchnames: SUSE-2026-4708,SUSE-SLE-Module-Live-Patching-15-SP7-2026-4708
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-63887
8.3 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Linux Enterprise Live Patching 15 SP7:kernel-livepatch-6_4_0-150700_7_72-rt-0:4-150700.2.1.x86_64 —
Vendor Fix
Threats
Impact important
CVE-2026-68158
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Affected products
Recommended 1 product, the same list as for CVE-2026-63887
Threats
Impact important
References
To clipboard 

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    "distribution": {
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      },
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        "category": "description",
        "text": "\nThis update for the SUSE Linux Enterprise Kernel 6.4.0-150700.7.72 fixes various security issues:\n\nThe following security issues were fixed:\n\n- CVE-2026-63887: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (bsc#1272386).\n- CVE-2026-68158: libceph: Fix multiplication overflow in decode_new_up_state_weight() (bsc#1276303).\n",
        "title": "Description of the patch"
      },
      {
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        "text": "SUSE-2026-4708,SUSE-SLE-Module-Live-Patching-15-SP7-2026-4708",
        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
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        "url": "https://bugzilla.suse.com/1272386"
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        "summary": "SUSE Bug 1276303",
        "url": "https://bugzilla.suse.com/1276303"
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        "url": "https://www.suse.com/security/cve/CVE-2026-68158/"
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    ],
    "title": "Security update for the Linux Kernel RT (Live Patch 19 for SUSE Linux Enterprise 15 SP7)",
    "tracking": {
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      "id": "SUSE-SU-2026:4708-1",
      "initial_release_date": "2026-10-16T13:41:49Z",
      "revision_history": [
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          "date": "2026-10-16T13:41:49Z",
          "number": "1",
          "summary": "Current version"
        },
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          "summary": "unknown changes"
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                "category": "product_version",
                "name": "kernel-livepatch-6_4_0-150700_7_72-rt-0:4-150700.2.1.x86_64",
                "product": {
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  "vulnerabilities": [
    {
      "cve": "CVE-2026-63887",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-63887"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf\n\niscsi_encode_text_output() concatenates \"key=value\\0\" records into\nlogin-\u003ersp_buf, an 8192-byte kzalloc(MAX_KEY_VALUE_PAIRS) buffer\nallocated in iscsit_alloc_login_setup_buffer(). The three sprintf() call\nsites in this function (lines 1398, 1411, 1424 in v7.1-rc2) never check\nthe remaining buffer capacity:\n\n\t*length += sprintf(output_buf, \"%s=%s\", er-\u003ekey, er-\u003evalue);\n\t*length += 1;\n\toutput_buf = textbuf + *length;\n\nThe 8192-byte ceiling at iscsi_target_check_login_request() bounds the\n*input* Login PDU payload, but a single PDU can carry up to 2048 minimal\nfour-byte \"a=b\\0\" pairs, each unknown key expanding to a 16-byte\n\"a=NotUnderstood\\0\" output record via iscsi_add_notunderstood_response().\n2048 * 16 = 32 KiB of output into an 8 KiB buffer, producing a ~24 KiB\nheap overrun in the kmalloc-8k slab.\n\nThe fix introduces a static iscsi_encode_text_record() helper that uses\nsnprintf() with a per-call bounds check against the remaining buffer,\nand threads a u32 textbuf_size parameter through\niscsi_encode_text_output(). Both call sites in\niscsi_target_handle_csg_zero() (PHASE_SECURITY) and\niscsi_target_handle_csg_one() (PHASE_OPERATIONAL) pass\nMAX_KEY_VALUE_PAIRS. On overflow the encoder logs the condition, calls\niscsi_release_extra_responses() to drop queued records, and returns -1;\nboth caller sites now emit ISCSI_STATUS_CLS_INITIATOR_ERR /\nISCSI_LOGIN_STATUS_INIT_ERR via iscsit_tx_login_rsp() before returning,\nso the initiator sees an explicit failed-login response rather than a\nsilent connection drop. (Prior to this patch only the PHASE_OPERATIONAL\ncaller did that; the PHASE_SECURITY caller is converted to the same\nshape.)",
          "title": "CVE description"
        }
      ],
      "product_status": {
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        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-63887",
          "url": "https://www.suse.com/security/cve/CVE-2026-63887"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1272385 for CVE-2026-63887",
          "url": "https://bugzilla.suse.com/1272385"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1272386 for CVE-2026-63887",
          "url": "https://bugzilla.suse.com/1272386"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Enterprise Live Patching 15 SP7:kernel-livepatch-6_4_0-150700_7_72-rt-0:4-150700.2.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Enterprise Live Patching 15 SP7:kernel-livepatch-6_4_0-150700_7_72-rt-0:4-150700.2.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-10-16T13:41:49Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-63887"
    },
    {
      "cve": "CVE-2026-68158",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-68158"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Fix multiplication overflow in decode_new_up_state_weight()\n\nIf a message of type CEPH_MSG_OSD_MAP contains a (maliciously) corrupted\nosdmap, out-of-bounds memory accesses may occur in\ndecode_new_up_state_weight(). This happens because the bounds check for\nthe new_state part is based on calculating its length depending on a len\nvalue read from the incoming message. This calculation may overflow\nleading to an incorrect bounds check. Subsequently, out-of-bounds reads\nmay occur when decoding this part.\n\nThis patch switches the multiplication to use check_mul_overflow() to\nabort processing the osdmap if an overflow occurred. Therefore,\nosdmaps/messages containing large values for len that result in a\nmultiplication overflow are treated as invalid.\n\n[ idryomov: rename new_state_len -\u003e new_state_item_size, formatting ]",
          "title": "CVE description"
        }
      ],
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          "url": "https://www.suse.com/security/cve/CVE-2026-68158"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1275307 for CVE-2026-68158",
          "url": "https://bugzilla.suse.com/1275307"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1276303 for CVE-2026-68158",
          "url": "https://bugzilla.suse.com/1276303"
        }
      ],
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        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Enterprise Live Patching 15 SP7:kernel-livepatch-6_4_0-150700_7_72-rt-0:4-150700.2.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Enterprise Live Patching 15 SP7:kernel-livepatch-6_4_0-150700_7_72-rt-0:4-150700.2.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-10-16T13:41:49Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-68158"
    }
  ]
}



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