{ "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\ntracing/histograms: Fix memory leak problem\n\nThis reverts commit 46bbe5c671e06f070428b9be142cc4ee5cedebac.\n\nAs commit 46bbe5c671e0 (\"tracing: fix double free\") said, the\n\"double free\" problem reported by clang static analyzer is:\n > In parse_var_defs() if there is a problem allocating\n > var_defs.expr, the earlier var_defs.name is freed.\n > This free is duplicated by free_var_defs() which frees\n > the rest of the list.\n\nHowever, if there is a problem allocating N-th var_defs.expr:\n + in parse_var_defs(), the freed 'earlier var_defs.name' is\n actually the N-th var_defs.name;\n + then in free_var_defs(), the names from 0th to (N-1)-th are freed;\n\n IF ALLOCATING PROBLEM HAPPENED HERE!!! -+\n \\\n |\n 0th 1th (N-1)-th N-th V\n +-------------+-------------+-----+-------------+-----------\nvar_defs: | name | expr | name | expr | ... | name | expr | name | ///\n +-------------+-------------+-----+-------------+-----------\n\nThese two frees don't act on same name, so there was no \"double free\"\nproblem before. Conversely, after that commit, we get a \"memory leak\"\nproblem because the above \"N-th var_defs.name\" is not freed.\n\nIf enable CONFIG_DEBUG_KMEMLEAK and inject a fault at where the N-th\nvar_defs.expr allocated, then execute on shell like:\n $ echo 'hist:key=call_site:val=$v1,$v2:v1=bytes_req,v2=bytes_alloc' > \\\n/sys/kernel/debug/tracing/events/kmem/kmalloc/trigger\n\nThen kmemleak reports:\n unreferenced object 0xffff8fb100ef3518 (size 8):\n comm \"bash\", pid 196, jiffies 4295681690 (age 28.538s)\n hex dump (first 8 bytes):\n 76 31 00 00 b1 8f ff ff v1......\n backtrace:\n [<0000000038fe4895>] kstrdup+0x2d/0x60\n [<00000000c99c049a>] event_hist_trigger_parse+0x206f/0x20e0\n [<00000000ae70d2cc>] trigger_process_regex+0xc0/0x110\n [<0000000066737a4c>] event_trigger_write+0x75/0xd0\n [<000000007341e40c>] vfs_write+0xbb/0x2a0\n [<0000000087fde4c2>] ksys_write+0x59/0xd0\n [<00000000581e9cdf>] do_syscall_64+0x3a/0x80\n [<00000000cf3b065c>] entry_SYSCALL_64_after_hwframe+0x46/0xb0", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49648" }, { "summary":"CVE-2022-49648 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2022/csaf-openeuler-cve-2022-49648.json" }, { "summary":"openEuler-SA-2025-1282", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1282" }, { "summary":"CVE-2022-49648", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2022-49648&packageName=kernel" } ], "title":"openEuler cve CVE-2022-49648", "tracking":{ "initial_release_date":"2025-03-14T23:37:29+08:00", "revision_history":[ { "date":"2025-03-14T23:37:29+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2025-03-14T23:37:29+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2025-03-14T23:37:29+08:00", "id":"CVE-2022-49648", "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:20.03-LTS-SP4" }, "product_id":"openEuler-20.03-LTS-SP4", "name":"openEuler-20.03-LTS-SP4" }, "name":"openEuler-20.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:20.03-LTS-SP4" }, "product_id":"bpftool-4.19.90-2503.3.0.0319.oe2003sp4.aarch64.rpm", "name":"bpftool-4.19.90-2503.3.0.0319.oe2003sp4.aarch64.rpm" }, 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> the rest of the list.\n\nHowever, if there is a problem allocating N-th var_defs.expr:\n + in parse_var_defs(), the freed 'earlier var_defs.name' is\n actually the N-th var_defs.name;\n + then in free_var_defs(), the names from 0th to (N-1)-th are freed;\n\n IF ALLOCATING PROBLEM HAPPENED HERE!!! -+\n \\\n |\n 0th 1th (N-1)-th N-th V\n +-------------+-------------+-----+-------------+-----------\nvar_defs: | name | expr | name | expr | ... | name | expr | name | ///\n +-------------+-------------+-----+-------------+-----------\n\nThese two frees don't act on same name, so there was no \"double free\"\nproblem before. Conversely, after that commit, we get a \"memory leak\"\nproblem because the above \"N-th var_defs.name\" is not freed.\n\nIf enable CONFIG_DEBUG_KMEMLEAK and inject a fault at where the N-th\nvar_defs.expr allocated, then execute on shell like:\n $ echo 'hist:key=call_site:val=$v1,$v2:v1=bytes_req,v2=bytes_alloc' > \\\n/sys/kernel/debug/tracing/events/kmem/kmalloc/trigger\n\nThen kmemleak reports:\n unreferenced object 0xffff8fb100ef3518 (size 8):\n comm \"bash\", pid 196, jiffies 4295681690 (age 28.538s)\n hex dump (first 8 bytes):\n 76 31 00 00 b1 8f ff ff v1......\n backtrace:\n [<0000000038fe4895>] kstrdup+0x2d/0x60\n [<00000000c99c049a>] event_hist_trigger_parse+0x206f/0x20e0\n [<00000000ae70d2cc>] trigger_process_regex+0xc0/0x110\n [<0000000066737a4c>] event_trigger_write+0x75/0xd0\n [<000000007341e40c>] vfs_write+0xbb/0x2a0\n [<0000000087fde4c2>] ksys_write+0x59/0xd0\n [<00000000581e9cdf>] do_syscall_64+0x3a/0x80\n [<00000000cf3b065c>] entry_SYSCALL_64_after_hwframe+0x46/0xb0", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-20.03-LTS-SP4:bpftool-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:bpftool-debuginfo-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debuginfo-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debugsource-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-devel-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-source-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-debuginfo-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-devel-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:perf-4.19.90-2503.3.0.0319.oe2003sp4.aarch64", 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