CVE-2024-56759

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://git.kernel.org/stable/c/44f52bbe96dfdbe4aca3818a2534520082a07040", "name": "https://git.kernel.org/stable/c/44f52bbe96dfdbe4aca3818a2534520082a07040", "tags": ["Patch"], "refsource": ""}, {"url": "https://git.kernel.org/stable/c/526ff5b27f090fb15040471f892cd2c9899ce314", "name": "https://git.kernel.org/stable/c/526ff5b27f090fb15040471f892cd2c9899ce314", "tags": [], "refsource": ""}, {"url": "https://git.kernel.org/stable/c/66376f1a73cba57fd0af2631d7888605b738e499", "name": "https://git.kernel.org/stable/c/66376f1a73cba57fd0af2631d7888605b738e499", "tags": [], "refsource": ""}, {"url": "https://git.kernel.org/stable/c/9a466b8693b9add05de99af00c7bdff8259ecf19", "name": "https://git.kernel.org/stable/c/9a466b8693b9add05de99af00c7bdff8259ecf19", "tags": [], "refsource": ""}, {"url": "https://git.kernel.org/stable/c/ba5120a2fb5f23b4d39d302e181aa5d4e28a90d1", "name": "https://git.kernel.org/stable/c/ba5120a2fb5f23b4d39d302e181aa5d4e28a90d1", "tags": [], "refsource": ""}, {"url": "https://git.kernel.org/stable/c/c3a403d8ce36f5a809a492581de5ad17843e4701", "name": "https://git.kernel.org/stable/c/c3a403d8ce36f5a809a492581de5ad17843e4701", "tags": ["Patch"], "refsource": ""}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix use-after-free when COWing tree bock and tracing is enabled\n\nWhen a COWing a tree block, at btrfs_cow_block(), and we have the\ntracepoint trace_btrfs_cow_block() enabled and preemption is also enabled\n(CONFIG_PREEMPT=y), we can trigger a use-after-free in the COWed extent\nbuffer while inside the tracepoint code. This is because in some paths\nthat call btrfs_cow_block(), such as btrfs_search_slot(), we are holding\nthe last reference on the extent buffer @buf so btrfs_force_cow_block()\ndrops the last reference on the @buf extent buffer when it calls\nfree_extent_buffer_stale(buf), which schedules the release of the extent\nbuffer with RCU. This means that if we are on a kernel with preemption,\nthe current task may be preempted before calling trace_btrfs_cow_block()\nand the extent buffer already released by the time trace_btrfs_cow_block()\nis called, resulting in a use-after-free.\n\nFix this by moving the trace_btrfs_cow_block() from btrfs_cow_block() to\nbtrfs_force_cow_block() before the COWed extent buffer is freed.\nThis also has a side effect of invoking the tracepoint in the tree defrag\ncode, at defrag.c:btrfs_realloc_node(), since btrfs_force_cow_block() is\ncalled there, but this is fine and it was actually missing there."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-416"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2024-56759", "ASSIGNER": "cve@kernel.org"}}, "impact": {"baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}}, "publishedDate": "2025-01-06T17:15Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "6.12.8"}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2025-02-11T16:15Z"}