CVE-2026-31434

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As a result, kobject_put() is\nnot called and the associated kobj->name objects are leaked.\n\nThis memory leak is reproduced by running the blktests test case\nzbd/009 on kernels built with CONFIG_DEBUG_KMEMLEAK. The kmemleak\nfeature reports the following error:\n\nunreferenced object 0xffff888112877d40 (size 16):\n comm \"mount\", pid 1244, jiffies 4294996972\n hex dump (first 16 bytes):\n 64 61 74 61 2d 72 65 6c 6f 63 00 c4 c6 a7 cb 7f data-reloc......\n backtrace (crc 53ffde4d):\n __kmalloc_node_track_caller_noprof+0x619/0x870\n kstrdup+0x42/0xc0\n kobject_set_name_vargs+0x44/0x110\n kobject_init_and_add+0xcf/0x150\n btrfs_sysfs_add_space_info_type+0xfc/0x210 [btrfs]\n create_space_info_sub_group.constprop.0+0xfb/0x1b0 [btrfs]\n create_space_info+0x211/0x320 [btrfs]\n btrfs_init_space_info+0x15a/0x1b0 [btrfs]\n open_ctree+0x33c7/0x4a50 [btrfs]\n btrfs_get_tree.cold+0x9f/0x1ee [btrfs]\n vfs_get_tree+0x87/0x2f0\n vfs_cmd_create+0xbd/0x280\n __do_sys_fsconfig+0x3df/0x990\n do_syscall_64+0x136/0x1540\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nTo avoid the leak, call btrfs_sysfs_remove_space_info() instead of\nkfree() for the elements."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/block-group.c"], "versions": [{"version": "64c7ddda83acfbaa0efb381a1928ce908c584607", "lessThan": "416484f21a9d1280cf6daa7ebc10c79b59c46e48", "status": "affected", "versionType": "git"}, {"version": "0bd151ce4200ca847990e05cca29a76456982ca5", "lessThan": "94054ffd311a1f76b7093ba8ebf50bdb0d28337c", "status": "affected", "versionType": "git"}, {"version": "190d5a7c4fe42b8c9aa46e3336389e7cb10395bb", "lessThan": "1737ddeafbb1304f41ec2eede4f7366082e7c96a", "status": "affected", "versionType": "git"}, {"version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "3c844d01f9874a43004c82970d8da94f9aba8949", "status": "affected", "versionType": "git"}, {"version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "3c645c6f7e5470debbb81666b230056de48f36dc", "status": "affected", "versionType": "git"}, {"version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41", "status": "affected", "versionType": "git"}, {"version": "6.1.162", "lessThan": "6.1.168", "status": "affected", "versionType": "semver"}, {"version": "6.6.122", "lessThan": "6.6.131", "status": "affected", "versionType": "semver"}, {"version": "6.12.67", "lessThan": "6.12.80", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/block-group.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.1.162", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.122", "versionEndExcluding": "6.6.131"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.67", "versionEndExcluding": "6.12.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.19.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/416484f21a9d1280cf6daa7ebc10c79b59c46e48"}, {"url": "https://git.kernel.org/stable/c/94054ffd311a1f76b7093ba8ebf50bdb0d28337c"}, {"url": "https://git.kernel.org/stable/c/1737ddeafbb1304f41ec2eede4f7366082e7c96a"}, {"url": "https://git.kernel.org/stable/c/3c844d01f9874a43004c82970d8da94f9aba8949"}, {"url": "https://git.kernel.org/stable/c/3c645c6f7e5470debbb81666b230056de48f36dc"}, {"url": "https://git.kernel.org/stable/c/a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41"}], "title": "btrfs: fix leak of kobject name for sub-group space_info", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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However, when\ncheck_removing_space_info() frees these elements, it does not call\nbtrfs_sysfs_remove_space_info() on them. As a result, kobject_put() is\nnot called and the associated kobj->name objects are leaked.\n\nThis memory leak is reproduced by running the blktests test case\nzbd/009 on kernels built with CONFIG_DEBUG_KMEMLEAK. The kmemleak\nfeature reports the following error:\n\nunreferenced object 0xffff888112877d40 (size 16):\n comm \"mount\", pid 1244, jiffies 4294996972\n hex dump (first 16 bytes):\n 64 61 74 61 2d 72 65 6c 6f 63 00 c4 c6 a7 cb 7f data-reloc......\n backtrace (crc 53ffde4d):\n __kmalloc_node_track_caller_noprof+0x619/0x870\n kstrdup+0x42/0xc0\n kobject_set_name_vargs+0x44/0x110\n kobject_init_and_add+0xcf/0x150\n btrfs_sysfs_add_space_info_type+0xfc/0x210 [btrfs]\n create_space_info_sub_group.constprop.0+0xfb/0x1b0 [btrfs]\n create_space_info+0x211/0x320 [btrfs]\n btrfs_init_space_info+0x15a/0x1b0 [btrfs]\n open_ctree+0x33c7/0x4a50 [btrfs]\n btrfs_get_tree.cold+0x9f/0x1ee [btrfs]\n vfs_get_tree+0x87/0x2f0\n vfs_cmd_create+0xbd/0x280\n __do_sys_fsconfig+0x3df/0x990\n do_syscall_64+0x136/0x1540\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nTo avoid the leak, call btrfs_sysfs_remove_space_info() instead of\nkfree() for the elements."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbtrfs: corrige la fuga de nombre de kobject para subgrupo space_info\n\nCuando create_space_info_sub_group() asigna elementos de space_info -> sub_group[], se llama a kobject_init_and_add() para cada elemento a trav\u00e9s de btrfs_sysfs_add_space_info_type(). Sin embargo, cuando check_removing_space_info() libera estos elementos, no llama a btrfs_sysfs_remove_space_info() sobre ellos. Como resultado, no se llama a kobject_put() y los objetos kobj -> name asociados se fugan.\n\nEsta fuga de memoria se reproduce ejecutando el caso de prueba blktests zbd/009 en kernels compilados con CONFIG_DEBUG_KMEMLEAK. La caracter\u00edstica kmemleak informa el siguiente error:\n\nobjeto sin referencia 0x ffff888112877d40 (tama\u00f1o 16):\n comm \u2019mount\u2019, pid 1244, jiffies 4294996972\n volcado hexadecimal (primeros 16 bytes):\n 64 61 74 61 2d 72 65 6c 6f 63 00 c4 c6 a7 cb 7f data-reloc......\n rastreo (crc 53ffde4d):\n __kmalloc_node_track_caller_noprof+0x619/0x870\n kstrdup+0x42/0xc0\n kobject_set_name_vargs+0x44/0x110\n kobject_init_and_add+0xcf/0x150\n btrfs_sysfs_add_space_info_type+0xfc/0x210 [btrfs]\n create_space_info_sub_group.constprop.0+0xfb/0x1b0 [btrfs]\n create_space_info+0x211/0x320 [btrfs]\n btrfs_init_space_info+0x15a/0x1b0 [btrfs]\n open_ctree+0x 33c7/0x 4a50 [btrfs]\n btrfs_get_tree.cold+0x9f/0x1ee [btrfs]\n vfs_get_tree+0x87/0x2f0\n vfs_cmd_create+0xbd/0x280\n __do_sys_fsconfig+0x3df/0x990\n do_syscall_64+0x136/0x 1540\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nPara evitar la fuga, llame a btrfs_sysfs_remove_space_info() en lugar de kfree() para los elementos."}], "id": "CVE-2026-31434", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-04-22T14:16:36.533", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1737ddeafbb1304f41ec2eede4f7366082e7c96a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c645c6f7e5470debbb81666b230056de48f36dc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c844d01f9874a43004c82970d8da94f9aba8949"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/416484f21a9d1280cf6daa7ebc10c79b59c46e48"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94054ffd311a1f76b7093ba8ebf50bdb0d28337c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: btrfs: fix leak of kobject name for sub-group space_info", "id": "2460728", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460728"}, "csaw": false, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's btrfs filesystem. When sub-groups for space information are created, associated kobject names are allocated. However, these names are not properly released when the sub-groups are removed, leading to a memory leak. A local user could exploit this vulnerability by repeatedly triggering the allocation and removal of these sub-groups, potentially causing system resource exhaustion and a denial of service."], "name": "CVE-2026-31434", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31434\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31434\nhttps://lore.kernel.org/linux-cve-announce/2026042240-CVE-2026-31434-87f3@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64c7ddda83acfbaa0efb381a1928ce908c584607,416484f21a9d1280cf6daa7ebc10c79b59c46e48)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0bd151ce4200ca847990e05cca29a76456982ca5,94054ffd311a1f76b7093ba8ebf50bdb0d28337c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[190d5a7c4fe42b8c9aa46e3336389e7cb10395bb,1737ddeafbb1304f41ec2eede4f7366082e7c96a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f92ee31e031c7819126d2febdda0c3e91f5d2eb9,3c844d01f9874a43004c82970d8da94f9aba8949)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f92ee31e031c7819126d2febdda0c3e91f5d2eb9,3c645c6f7e5470debbb81666b230056de48f36dc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f92ee31e031c7819126d2febdda0c3e91f5d2eb9,a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.131,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-04-22T15:30:20.459958+00:00", "updated": "2026-05-20T16:45:34.777662+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}