{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-68262", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-16T13:41:40.267Z", "datePublished": "2025-12-16T14:45:04.198Z", "dateUpdated": "2025-12-16T14:45:04.198Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-16T14:45:04.198Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: zstd - fix double-free in per-CPU stream cleanup\n\nThe crypto/zstd module has a double-free bug that occurs when multiple\ntfms are allocated and freed.\n\nThe issue happens because zstd_streams (per-CPU contexts) are freed in\nzstd_exit() during every tfm destruction, rather than being managed at\nthe module level. When multiple tfms exist, each tfm exit attempts to\nfree the same shared per-CPU streams, resulting in a double-free.\n\nThis leads to a stack trace similar to:\n\n BUG: Bad page state in process kworker/u16:1 pfn:106fd93\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106fd93\n flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\n page_type: 0xffffffff()\n raw: 0017ffffc0000000 dead000000000100 dead000000000122 0000000000000000\n raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n page dumped because: nonzero entire_mapcount\n Modules linked in: ...\n CPU: 3 UID: 0 PID: 2506 Comm: kworker/u16:1 Kdump: loaded Tainted: G B\n Hardware name: ...\n Workqueue: btrfs-delalloc btrfs_work_helper\n Call Trace:\n <TASK>\n dump_stack_lvl+0x5d/0x80\n bad_page+0x71/0xd0\n free_unref_page_prepare+0x24e/0x490\n free_unref_page+0x60/0x170\n crypto_acomp_free_streams+0x5d/0xc0\n crypto_acomp_exit_tfm+0x23/0x50\n crypto_destroy_tfm+0x60/0xc0\n ...\n\nChange the lifecycle management of zstd_streams to free the streams only\nonce during module cleanup."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["crypto/zstd.c"], "versions": [{"version": "f5ad93ffb54119a8dc5e18f070624d4ead586969", "lessThan": "dc0f4509b0ed5d82bef78e058db0ac4df04d0695", "status": "affected", "versionType": "git"}, {"version": "f5ad93ffb54119a8dc5e18f070624d4ead586969", "lessThan": "e983feaa79de1e46c9087fb9f02fedb0e5397ce6", "status": "affected", "versionType": "git"}, {"version": "f5ad93ffb54119a8dc5e18f070624d4ead586969", "lessThan": "48bc9da3c97c15f1ea24934bcb3b736acd30163d", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["crypto/zstd.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.12", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.1", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19-rc1", "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": "6.17", "versionEndExcluding": "6.17.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.18.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.19-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/dc0f4509b0ed5d82bef78e058db0ac4df04d0695"}, {"url": "https://git.kernel.org/stable/c/e983feaa79de1e46c9087fb9f02fedb0e5397ce6"}, {"url": "https://git.kernel.org/stable/c/48bc9da3c97c15f1ea24934bcb3b736acd30163d"}], "title": "crypto: zstd - fix double-free in per-CPU stream cleanup", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: zstd - fix double-free in per-CPU stream cleanup\n\nThe crypto/zstd module has a double-free bug that occurs when multiple\ntfms are allocated and freed.\n\nThe issue happens because zstd_streams (per-CPU contexts) are freed in\nzstd_exit() during every tfm destruction, rather than being managed at\nthe module level. When multiple tfms exist, each tfm exit attempts to\nfree the same shared per-CPU streams, resulting in a double-free.\n\nThis leads to a stack trace similar to:\n\n BUG: Bad page state in process kworker/u16:1 pfn:106fd93\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106fd93\n flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\n page_type: 0xffffffff()\n raw: 0017ffffc0000000 dead000000000100 dead000000000122 0000000000000000\n raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n page dumped because: nonzero entire_mapcount\n Modules linked in: ...\n CPU: 3 UID: 0 PID: 2506 Comm: kworker/u16:1 Kdump: loaded Tainted: G B\n Hardware name: ...\n Workqueue: btrfs-delalloc btrfs_work_helper\n Call Trace:\n <TASK>\n dump_stack_lvl+0x5d/0x80\n bad_page+0x71/0xd0\n free_unref_page_prepare+0x24e/0x490\n free_unref_page+0x60/0x170\n crypto_acomp_free_streams+0x5d/0xc0\n crypto_acomp_exit_tfm+0x23/0x50\n crypto_destroy_tfm+0x60/0xc0\n ...\n\nChange the lifecycle management of zstd_streams to free the streams only\nonce during module cleanup."}], "id": "CVE-2025-68262", "lastModified": "2025-12-16T15:15:55.697", "metrics": {}, "published": "2025-12-16T15:15:55.697", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/48bc9da3c97c15f1ea24934bcb3b736acd30163d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dc0f4509b0ed5d82bef78e058db0ac4df04d0695"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e983feaa79de1e46c9087fb9f02fedb0e5397ce6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}