{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49648", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:21:30.432Z", "datePublished": "2025-02-26T02:23:52.035Z", "dateUpdated": "2026-05-23T15:22:38.887Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T15:22:38.887Z" }, "descriptions": [ { "lang": "en", "value": "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" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/trace/trace_events_hist.c" ], "versions": [ { "version": "240dd5118a9e0454f280ffeae63f22bd14735733", "lessThan": "eb622d5580b9e2ff694f62da6410618bd73853cb", "status": "affected", "versionType": "git" }, { "version": "e92c490f104993cea35e5f5d5108ac12df1850ac", "lessThan": "ecc6dec12c33aa92c086cd702af9f544ddaf3c75", "status": "affected", "versionType": "git" }, { "version": "46bbe5c671e06f070428b9be142cc4ee5cedebac", "lessThan": "78a1400c42ee11197eb1f0f85ba51df9a4fdfff0", "status": "affected", "versionType": "git" }, { "version": "46bbe5c671e06f070428b9be142cc4ee5cedebac", "lessThan": "22eeff55679d9e7c0f768c79bfbd83e2f8142d89", "status": "affected", "versionType": "git" }, { "version": "46bbe5c671e06f070428b9be142cc4ee5cedebac", "lessThan": "4d453eb5e1eec89971aa5b3262857ee26cfdffd3", "status": "affected", "versionType": "git" }, { "version": "46bbe5c671e06f070428b9be142cc4ee5cedebac", "lessThan": "7edc3945bdce9c39198a10d6129377a5c53559c2", "status": "affected", "versionType": "git" }, { "version": "e3a23511638a3dcf0275c1e71a46d1ca2e2e6788", "status": "affected", "versionType": "git" }, { "version": "4.19.149", "lessThan": "4.19.253", "status": "affected", "versionType": "semver" }, { "version": "5.4.69", "lessThan": "5.4.207", "status": "affected", "versionType": "semver" }, { "version": "5.8.13", "lessThan": "5.9", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/trace/trace_events_hist.c" ], "versions": [ { "version": "5.9", "status": "affected" }, { "version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.253", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.207", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.132", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.56", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.13", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.149", "versionEndExcluding": "4.19.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.69", "versionEndExcluding": "5.4.207" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.10.132" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.15.56" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.18.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/eb622d5580b9e2ff694f62da6410618bd73853cb" }, { "url": "https://git.kernel.org/stable/c/ecc6dec12c33aa92c086cd702af9f544ddaf3c75" }, { "url": "https://git.kernel.org/stable/c/78a1400c42ee11197eb1f0f85ba51df9a4fdfff0" }, { "url": "https://git.kernel.org/stable/c/22eeff55679d9e7c0f768c79bfbd83e2f8142d89" }, { "url": "https://git.kernel.org/stable/c/4d453eb5e1eec89971aa5b3262857ee26cfdffd3" }, { "url": "https://git.kernel.org/stable/c/7edc3945bdce9c39198a10d6129377a5c53559c2" } ], "title": "tracing/histograms: Fix memory leak problem", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-49648", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T19:33:48.167860Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-401", "description": "CWE-401 Missing Release of Memory after Effective Lifetime" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T19:36:48.613Z" } } ] } }