{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"Medium" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"kernel security update", "category":"general", "title":"Synopsis" }, { "text":"An update for kernel is now available for openEuler-22.03-LTS-SP4", "category":"general", "title":"Summary" }, { "text":"The Linux Kernel, the operating system core itself.\n\nSecurity Fix(es):\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/dp/mst: fix buffer overflows in sideband chunk accumulation\n\ndrm_dp_sideband_append_payload() has three related bugs when processing\ndevice-provided sideband reply data:\n\n1. Zero-length curchunk_len underflow: msg_len is a 6-bit field taken\n directly from the DP sideband header. If a device sends msg_len=0,\n curchunk_len is set to zero. The condition (curchunk_idx >= curchunk_len)\n is immediately true, and curchunk_len-1 wraps to 255 (u8 underflow).\n drm_dp_msg_data_crc4() reads 255 bytes from chunk[48], then memcpy()\n writes 255 bytes into msg[], both far out of bounds.\n\n2. chunk[48] overflow: curchunk_len can reach 63 (6-bit field). chunk[] is\n only 48 bytes. Multi-iteration payload assembly appends 16-byte blocks\n until curchunk_idx reaches curchunk_len, writing up to 15 bytes past\n the end of chunk[] into msg[].\n\n3. msg[256] overflow: each chunk contributes (curchunk_len-1) bytes to\n msg[]. No check ensures curlen + (curchunk_len-1) stays within msg[256],\n so the memcpy can spill into adjacent struct fields.\n\nAll three are reachable from any DP MST device that can forge sideband\nreply messages on a physical connection.(CVE-2026-68278)\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix invalidate lock leak on open O_TRUNC DAX failure\n\nfuse_open() takes filemap_invalidate_lock() for a DAX truncate\n(dax_truncate = true) and releases it before the out_inode_unlock\nlabel. But when fuse_dax_break_layouts() fails, the goto\nout_inode_unlock skips the unlock and leaks the rwsem, so any later\nfault or truncate on the file stalls on the stale lock.\n\nfuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal\ninterrupts the wait for busy DAX pages to drain:\n\n open(\"file\", O_RDWR | O_TRUNC)\n └─ fuse_open()\n ├─ filemap_invalidate_lock() # dax_truncate\n └─ fuse_dax_break_layouts()\n └─ dax_break_layout()\n └─ wait_page_idle() # TASK_INTERRUPTIBLE\n └─ fuse_wait_dax_page() # unlock, schedule, re-lock\n └─ signal → -ERESTARTSYS\n goto out_inode_unlock # <- lock leaked\n\nFix this by moving filemap_invalidate_unlock() below the label so\nthat all error paths release the lock, and rename the label to\nout_unlock as it now covers more than just the inode lock.(CVE-2026-80855)", "category":"general", "title":"Description" }, { "text":"An update for kernel is now available for openEuler-22.03-LTS-SP4/openEuler-22.03-LTS-SP3/openEuler-24.03-LTS-SP2/openEuler-24.03-LTS.\n\nopenEuler Security has rated this update as having a security impact of medium. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section.", "category":"general", "title":"Topic" }, { "text":"Medium", "category":"general", "title":"Severity" }, { "text":"kernel", "category":"general", "title":"Affected Component" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"openEuler-SA-2026-4436", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4436" }, { "summary":"CVE-2026-68278", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-68278&packageName=kernel" }, { "summary":"CVE-2026-80855", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-80855&packageName=kernel" }, { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68278" }, { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80855" }, { "summary":"openEuler-SA-2026-4436 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/advisories/2026/csaf-openeuler-sa-2026-4436.json" } ], "title":"An update for kernel is now available for openEuler-22.03-LTS-SP4", "tracking":{ "initial_release_date":"2026-10-30T11:10:40+08:00", "revision_history":[ { "date":"2026-10-30T11:10:40+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-10-30T11:10:40+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-10-30T11:10:40+08:00", "id":"openEuler-SA-2026-4436", "version":"1.0.0", "status":"final" } }, "product_tree":{ "branches":[ { 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Zero-length curchunk_len underflow: msg_len is a 6-bit field taken\n directly from the DP sideband header. If a device sends msg_len=0,\n curchunk_len is set to zero. The condition (curchunk_idx >= curchunk_len)\n is immediately true, and curchunk_len-1 wraps to 255 (u8 underflow).\n drm_dp_msg_data_crc4() reads 255 bytes from chunk[48], then memcpy()\n writes 255 bytes into msg[], both far out of bounds.\n\n2. chunk[48] overflow: curchunk_len can reach 63 (6-bit field). chunk[] is\n only 48 bytes. Multi-iteration payload assembly appends 16-byte blocks\n until curchunk_idx reaches curchunk_len, writing up to 15 bytes past\n the end of chunk[] into msg[].\n\n3. msg[256] overflow: each chunk contributes (curchunk_len-1) bytes to\n msg[]. No check ensures curlen + (curchunk_len-1) stays within msg[256],\n so the memcpy can spill into adjacent struct fields.\n\nAll three are reachable from any DP MST device that can forge sideband\nreply messages on a physical connection.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-source-5.10.0-338.0.0.239.oe2203sp4.x86_64", 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But when fuse_dax_break_layouts() fails, the goto\nout_inode_unlock skips the unlock and leaks the rwsem, so any later\nfault or truncate on the file stalls on the stale lock.\n\nfuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal\ninterrupts the wait for busy DAX pages to drain:\n\n open(\"file\", O_RDWR | O_TRUNC)\n └─ fuse_open()\n ├─ filemap_invalidate_lock() # dax_truncate\n └─ fuse_dax_break_layouts()\n └─ dax_break_layout()\n └─ wait_page_idle() # TASK_INTERRUPTIBLE\n └─ fuse_wait_dax_page() # unlock, schedule, re-lock\n └─ signal → -ERESTARTSYS\n goto out_inode_unlock # <- lock leaked\n\nFix this by moving filemap_invalidate_unlock() below the label so\nthat all error paths release the lock, and rename the label to\nout_unlock as it now covers more than just the inode lock.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-338.0.0.239.oe2203sp4.x86_64", 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"category":"vendor_fix", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4436" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"MEDIUM", "baseScore":4.7, "vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version":"3.1" }, "products":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-source-5.10.0-338.0.0.239.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-tools-5.10.0-338.0.0.239.oe2203sp4.x86_64", 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