{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40052", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.157Z", "datePublished": "2025-10-28T11:48:27.854Z", "dateUpdated": "2026-05-11T21:41:32.977Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:41:32.977Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix crypto buffers in non-linear memory\n\nThe crypto API, through the scatterlist API, expects input buffers to be\nin linear memory. We handle this with the cifs_sg_set_buf() helper\nthat converts vmalloc'd memory to their corresponding pages.\n\nHowever, when we allocate our aead_request buffer (@creq in\nsmb2ops.c::crypt_message()), we do so with kvzalloc(), which possibly\nputs aead_request->__ctx in vmalloc area.\n\nAEAD algorithm then uses ->__ctx for its private/internal data and\noperations, and uses sg_set_buf() for such data on a few places.\n\nThis works fine as long as @creq falls into kmalloc zone (small\nrequests) or vmalloc'd memory is still within linear range.\n\nTasks' stacks are vmalloc'd by default (CONFIG_VMAP_STACK=y), so too\nmany tasks will increment the base stacks' addresses to a point where\nvirt_addr_valid(buf) will fail (BUG() in sg_set_buf()) when that\nhappens.\n\nIn practice: too many parallel reads and writes on an encrypted mount\nwill trigger this bug.\n\nTo fix this, always alloc @creq with kmalloc() instead.\nAlso drop the @sensitive_size variable/arguments since\nkfree_sensitive() doesn't need it.\n\nBacktrace:\n\n[ 945.272081] ------------[ cut here ]------------\n[ 945.272774] kernel BUG at include/linux/scatterlist.h:209!\n[ 945.273520] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\n[ 945.274412] CPU: 7 UID: 0 PID: 56 Comm: kworker/u33:0 Kdump: loaded Not tainted 6.15.0-lku-11779-g8e9d6efccdd7-dirty #1 PREEMPT(voluntary)\n[ 945.275736] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-2-gc13ff2cd-prebuilt.qemu.org 04/01/2014\n[ 945.276877] Workqueue: writeback wb_workfn (flush-cifs-2)\n[ 945.277457] RIP: 0010:crypto_gcm_init_common+0x1f9/0x220\n[ 945.278018] Code: b0 00 00 00 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 c7 c0 00 00 00 80 48 2b 05 5c 58 e5 00 e9 58 ff ff ff <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 48 c7 04 24 01 00 00 00 48 8b\n[ 945.279992] RSP: 0018:ffffc90000a27360 EFLAGS: 00010246\n[ 945.280578] RAX: 0000000000000000 RBX: ffffc90001d85060 RCX: 0000000000000030\n[ 945.281376] RDX: 0000000000080000 RSI: 0000000000000000 RDI: ffffc90081d85070\n[ 945.282145] RBP: ffffc90001d85010 R08: ffffc90001d85000 R09: 0000000000000000\n[ 945.282898] R10: ffffc90001d85090 R11: 0000000000001000 R12: ffffc90001d85070\n[ 945.283656] R13: ffff888113522948 R14: ffffc90001d85060 R15: ffffc90001d85010\n[ 945.284407] FS: 0000000000000000(0000) GS:ffff8882e66cf000(0000) knlGS:0000000000000000\n[ 945.285262] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 945.285884] CR2: 00007fa7ffdd31f4 CR3: 000000010540d000 CR4: 0000000000350ef0\n[ 945.286683] Call Trace:\n[ 945.286952] <TASK>\n[ 945.287184] ? crypt_message+0x33f/0xad0 [cifs]\n[ 945.287719] crypto_gcm_encrypt+0x36/0xe0\n[ 945.288152] crypt_message+0x54a/0xad0 [cifs]\n[ 945.288724] smb3_init_transform_rq+0x277/0x300 [cifs]\n[ 945.289300] smb_send_rqst+0xa3/0x160 [cifs]\n[ 945.289944] cifs_call_async+0x178/0x340 [cifs]\n[ 945.290514] ? __pfx_smb2_writev_callback+0x10/0x10 [cifs]\n[ 945.291177] smb2_async_writev+0x3e3/0x670 [cifs]\n[ 945.291759] ? find_held_lock+0x32/0x90\n[ 945.292212] ? netfs_advance_write+0xf2/0x310\n[ 945.292723] netfs_advance_write+0xf2/0x310\n[ 945.293210] netfs_write_folio+0x346/0xcc0\n[ 945.293689] ? __pfx__raw_spin_unlock_irq+0x10/0x10\n[ 945.294250] netfs_writepages+0x117/0x460\n[ 945.294724] do_writepages+0xbe/0x170\n[ 945.295152] ? find_held_lock+0x32/0x90\n[ 945.295600] ? kvm_sched_clock_read+0x11/0x20\n[ 945.296103] __writeback_single_inode+0x56/0x4b0\n[ 945.296643] writeback_sb_inodes+0x229/0x550\n[ 945.297140] __writeback_inodes_wb+0x4c/0xe0\n[ 945.297642] wb_writeback+0x2f1/0x3f0\n[ 945.298069] wb_workfn+0x300/0x490\n[ 945.298472] process_one_work+0x1fe/0x590\n[ 945.298949] worker_thread+0x1ce/0x3c0\n[ 945.299397] ? __pfx_worker_thread+0x10/0x10\n[ 945.299900] kthr\n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2ops.c"], "versions": [{"version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2", "lessThan": "ba905a567105dde21cdb8e6d3a87110fa434b393", "status": "affected", "versionType": "git"}, {"version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2", "lessThan": "7a8a8c15468f0c99685e9964451feffd1a3cc859", "status": "affected", "versionType": "git"}, {"version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2", "lessThan": "4a61b68abd2788db0364c9a0b6a39f1699fea440", "status": "affected", "versionType": "git"}, {"version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2", "lessThan": "998a67b954680f26f3734040aeeed08642d49721", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2ops.c"], "versions": [{"version": "6.3", "status": "affected"}, {"version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.112", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.53", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.3", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "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": "6.3", "versionEndExcluding": "6.6.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.12.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.17.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ba905a567105dde21cdb8e6d3a87110fa434b393"}, {"url": "https://git.kernel.org/stable/c/7a8a8c15468f0c99685e9964451feffd1a3cc859"}, {"url": "https://git.kernel.org/stable/c/4a61b68abd2788db0364c9a0b6a39f1699fea440"}, {"url": "https://git.kernel.org/stable/c/998a67b954680f26f3734040aeeed08642d49721"}], "title": "smb: client: fix crypto buffers in non-linear memory", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix crypto buffers in non-linear memory\n\nThe crypto API, through the scatterlist API, expects input buffers to be\nin linear memory. We handle this with the cifs_sg_set_buf() helper\nthat converts vmalloc'd memory to their corresponding pages.\n\nHowever, when we allocate our aead_request buffer (@creq in\nsmb2ops.c::crypt_message()), we do so with kvzalloc(), which possibly\nputs aead_request->__ctx in vmalloc area.\n\nAEAD algorithm then uses ->__ctx for its private/internal data and\noperations, and uses sg_set_buf() for such data on a few places.\n\nThis works fine as long as @creq falls into kmalloc zone (small\nrequests) or vmalloc'd memory is still within linear range.\n\nTasks' stacks are vmalloc'd by default (CONFIG_VMAP_STACK=y), so too\nmany tasks will increment the base stacks' addresses to a point where\nvirt_addr_valid(buf) will fail (BUG() in sg_set_buf()) when that\nhappens.\n\nIn practice: too many parallel reads and writes on an encrypted mount\nwill trigger this bug.\n\nTo fix this, always alloc @creq with kmalloc() instead.\nAlso drop the @sensitive_size variable/arguments since\nkfree_sensitive() doesn't need it.\n\nBacktrace:\n\n[ 945.272081] ------------[ cut here ]------------\n[ 945.272774] kernel BUG at include/linux/scatterlist.h:209!\n[ 945.273520] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\n[ 945.274412] CPU: 7 UID: 0 PID: 56 Comm: kworker/u33:0 Kdump: loaded Not tainted 6.15.0-lku-11779-g8e9d6efccdd7-dirty #1 PREEMPT(voluntary)\n[ 945.275736] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-2-gc13ff2cd-prebuilt.qemu.org 04/01/2014\n[ 945.276877] Workqueue: writeback wb_workfn (flush-cifs-2)\n[ 945.277457] RIP: 0010:crypto_gcm_init_common+0x1f9/0x220\n[ 945.278018] Code: b0 00 00 00 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 c7 c0 00 00 00 80 48 2b 05 5c 58 e5 00 e9 58 ff ff ff <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 48 c7 04 24 01 00 00 00 48 8b\n[ 945.279992] RSP: 0018:ffffc90000a27360 EFLAGS: 00010246\n[ 945.280578] RAX: 0000000000000000 RBX: ffffc90001d85060 RCX: 0000000000000030\n[ 945.281376] RDX: 0000000000080000 RSI: 0000000000000000 RDI: ffffc90081d85070\n[ 945.282145] RBP: ffffc90001d85010 R08: ffffc90001d85000 R09: 0000000000000000\n[ 945.282898] R10: ffffc90001d85090 R11: 0000000000001000 R12: ffffc90001d85070\n[ 945.283656] R13: ffff888113522948 R14: ffffc90001d85060 R15: ffffc90001d85010\n[ 945.284407] FS: 0000000000000000(0000) GS:ffff8882e66cf000(0000) knlGS:0000000000000000\n[ 945.285262] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 945.285884] CR2: 00007fa7ffdd31f4 CR3: 000000010540d000 CR4: 0000000000350ef0\n[ 945.286683] Call Trace:\n[ 945.286952] <TASK>\n[ 945.287184] ? crypt_message+0x33f/0xad0 [cifs]\n[ 945.287719] crypto_gcm_encrypt+0x36/0xe0\n[ 945.288152] crypt_message+0x54a/0xad0 [cifs]\n[ 945.288724] smb3_init_transform_rq+0x277/0x300 [cifs]\n[ 945.289300] smb_send_rqst+0xa3/0x160 [cifs]\n[ 945.289944] cifs_call_async+0x178/0x340 [cifs]\n[ 945.290514] ? __pfx_smb2_writev_callback+0x10/0x10 [cifs]\n[ 945.291177] smb2_async_writev+0x3e3/0x670 [cifs]\n[ 945.291759] ? find_held_lock+0x32/0x90\n[ 945.292212] ? netfs_advance_write+0xf2/0x310\n[ 945.292723] netfs_advance_write+0xf2/0x310\n[ 945.293210] netfs_write_folio+0x346/0xcc0\n[ 945.293689] ? __pfx__raw_spin_unlock_irq+0x10/0x10\n[ 945.294250] netfs_writepages+0x117/0x460\n[ 945.294724] do_writepages+0xbe/0x170\n[ 945.295152] ? find_held_lock+0x32/0x90\n[ 945.295600] ? kvm_sched_clock_read+0x11/0x20\n[ 945.296103] __writeback_single_inode+0x56/0x4b0\n[ 945.296643] writeback_sb_inodes+0x229/0x550\n[ 945.297140] __writeback_inodes_wb+0x4c/0xe0\n[ 945.297642] wb_writeback+0x2f1/0x3f0\n[ 945.298069] wb_workfn+0x300/0x490\n[ 945.298472] process_one_work+0x1fe/0x590\n[ 945.298949] worker_thread+0x1ce/0x3c0\n[ 945.299397] ? __pfx_worker_thread+0x10/0x10\n[ 945.299900] kthr\n---truncated---"}], "id": "CVE-2025-40052", "lastModified": "2026-04-15T00:35:42.020", "metrics": {}, "published": "2025-10-28T12:15:39.383", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4a61b68abd2788db0364c9a0b6a39f1699fea440"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7a8a8c15468f0c99685e9964451feffd1a3cc859"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/998a67b954680f26f3734040aeeed08642d49721"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ba905a567105dde21cdb8e6d3a87110fa434b393"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: smb: client: fix crypto buffers in non-linear memory", "id": "2406750", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2406750"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-40052", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "2025-10-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40052\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40052\nhttps://lore.kernel.org/linux-cve-announce/2025102814-CVE-2025-40052-c482@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-29T10:58:10.867241+00:00", "updated": "2025-10-29T10:58:10.867276+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}