CVE-2025-40052
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-40052
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40052.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-40052
- Downstream
- Related
- Published
- 2025-10-28T11:48:27.854Z
- Modified
- 2025-12-05T10:22:22.210768Z
- Summary
- smb: client: fix crypto buffers in non-linear memory
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix crypto buffers in non-linear memory
The crypto API, through the scatterlist API, expects input buffers to be in linear memory. We handle this with the cifssgset_buf() helper that converts vmalloc'd memory to their corresponding pages.
However, when we allocate our aeadrequest buffer (@creq in smb2ops.c::cryptmessage()), we do so with kvzalloc(), which possibly puts aeadrequest->_ctx in vmalloc area.
AEAD algorithm then uses ->_ctx for its private/internal data and operations, and uses sgset_buf() for such data on a few places.
This works fine as long as @creq falls into kmalloc zone (small requests) or vmalloc'd memory is still within linear range.
Tasks' stacks are vmalloc'd by default (CONFIGVMAPSTACK=y), so too many tasks will increment the base stacks' addresses to a point where virtaddrvalid(buf) will fail (BUG() in sgsetbuf()) when that happens.
In practice: too many parallel reads and writes on an encrypted mount will trigger this bug.
To fix this, always alloc @creq with kmalloc() instead. Also drop the @sensitivesize variable/arguments since kfreesensitive() doesn't need it.
Backtrace:
[ 945.272081] ------------[ cut here ]------------ [ 945.272774] kernel BUG at include/linux/scatterlist.h:209! [ 945.273520] Oops: invalid opcode: 0000 [#1] SMP DEBUGPAGEALLOC NOPTI [ 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) [ 945.275736] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-2-gc13ff2cd-prebuilt.qemu.org 04/01/2014 [ 945.276877] Workqueue: writeback wbworkfn (flush-cifs-2) [ 945.277457] RIP: 0010:cryptogcminitcommon+0x1f9/0x220 [ 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 [ 945.279992] RSP: 0018:ffffc90000a27360 EFLAGS: 00010246 [ 945.280578] RAX: 0000000000000000 RBX: ffffc90001d85060 RCX: 0000000000000030 [ 945.281376] RDX: 0000000000080000 RSI: 0000000000000000 RDI: ffffc90081d85070 [ 945.282145] RBP: ffffc90001d85010 R08: ffffc90001d85000 R09: 0000000000000000 [ 945.282898] R10: ffffc90001d85090 R11: 0000000000001000 R12: ffffc90001d85070 [ 945.283656] R13: ffff888113522948 R14: ffffc90001d85060 R15: ffffc90001d85010 [ 945.284407] FS: 0000000000000000(0000) GS:ffff8882e66cf000(0000) knlGS:0000000000000000 [ 945.285262] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 945.285884] CR2: 00007fa7ffdd31f4 CR3: 000000010540d000 CR4: 0000000000350ef0 [ 945.286683] Call Trace: [ 945.286952] <TASK> [ 945.287184] ? cryptmessage+0x33f/0xad0 [cifs] [ 945.287719] cryptogcmencrypt+0x36/0xe0 [ 945.288152] cryptmessage+0x54a/0xad0 [cifs] [ 945.288724] smb3inittransformrq+0x277/0x300 [cifs] [ 945.289300] smbsendrqst+0xa3/0x160 [cifs] [ 945.289944] cifscallasync+0x178/0x340 [cifs] [ 945.290514] ? pfxsmb2writevcallback+0x10/0x10 [cifs] [ 945.291177] smb2asyncwritev+0x3e3/0x670 [cifs] [ 945.291759] ? findheldlock+0x32/0x90 [ 945.292212] ? netfsadvancewrite+0xf2/0x310 [ 945.292723] netfsadvancewrite+0xf2/0x310 [ 945.293210] netfswritefolio+0x346/0xcc0 [ 945.293689] ? _pfxrawspinunlockirq+0x10/0x10 [ 945.294250] netfswritepages+0x117/0x460 [ 945.294724] dowritepages+0xbe/0x170 [ 945.295152] ? findheldlock+0x32/0x90 [ 945.295600] ? kvmschedclockread+0x11/0x20 [ 945.296103] _writebacksingleinode+0x56/0x4b0 [ 945.296643] writebacksbinodes+0x229/0x550 [ 945.297140] _writebackinodeswb+0x4c/0xe0 [ 945.297642] wbwriteback+0x2f1/0x3f0 [ 945.298069] wbworkfn+0x300/0x490 [ 945.298472] processonework+0x1fe/0x590 [ 945.298949] workerthread+0x1ce/0x3c0 [ 945.299397] ? _pfxworkerthread+0x10/0x10 [ 945.299900] kthr ---truncated---
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40052.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/4a61b68abd2788db0364c9a0b6a39f1699fea440
- https://git.kernel.org/stable/c/7a8a8c15468f0c99685e9964451feffd1a3cc859
- https://git.kernel.org/stable/c/998a67b954680f26f3734040aeeed08642d49721
- https://git.kernel.org/stable/c/ba905a567105dde21cdb8e6d3a87110fa434b393
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40052.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-40052
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd08089f649a0cfb2099c8551ac47eef0cc23fdf2Fixedba905a567105dde21cdb8e6d3a87110fa434b393Fixed7a8a8c15468f0c99685e9964451feffd1a3cc859Fixed4a61b68abd2788db0364c9a0b6a39f1699fea440Fixed998a67b954680f26f3734040aeeed08642d49721