CVE-2022-50341
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
cifs: fix oops during encryption
When running xfstests against Azure the following oops occurred on an arm64 system
This is because in scatterwalk_copychunks(), we attempted to write to a buffer (@sign) that was allocated in the stack (vmalloc area) by crypt_message() and thus accessing its remaining 8 (x2) bytes ended up crossing a page boundary.
To simply fix it, we could just pass @sign kmalloc'd from crypt_message() and then we're done. Luckily, we don't seem to pass any other vmalloc'd buffers in smb_rqst::rq_iov...
Instead, let's map the correct pages and offsets from vmalloc buffers as well in cifs_sg_set_buf() and then avoiding such oopses.
Detalles técnicos trazas, registros y código del informe original
Unable to handle kernel write to read-only memory at virtual address
ffff0001221cf000
Mem abort info:
ESR = 0x9600004f
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x0f: level 3 permission fault
Data abort info:
ISV = 0, ISS = 0x0000004f
CM = 0, WnR = 1
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000294f3000
[ffff0001221cf000] pgd=18000001ffff8003, p4d=18000001ffff8003,
pud=18000001ff82e003, pmd=18000001ff71d003, pte=00600001221cf787
Internal error: Oops: 9600004f [#1] PREEMPT SMP
...
pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--)
pc : __memcpy+0x40/0x230
lr : scatterwalk_copychunks+0xe0/0x200
sp : ffff800014e92de0
x29: ffff800014e92de0 x28: ffff000114f9de80 x27: 0000000000000008
x26: 0000000000000008 x25: ffff800014e92e78 x24: 0000000000000008
x23: 0000000000000001 x22: 0000040000000000 x21: ffff000000000000
x20: 0000000000000001 x19: ffff0001037c4488 x18: 0000000000000014
x17: 235e1c0d6efa9661 x16: a435f9576b6edd6c x15: 0000000000000058
x14: 0000000000000001 x13: 0000000000000008 x12: ffff000114f2e590
x11: ffffffffffffffff x10: 0000040000000000 x9 : ffff8000105c3580
x8 : 2e9413b10000001a x7 : 534b4410fb86b005 x6 : 534b4410fb86b005
x5 : ffff0001221cf008 x4 : ffff0001037c4490 x3 : 0000000000000001
x2 : 0000000000000008 x1 : ffff0001037c4488 x0 : ffff0001221cf000
Call trace:
__memcpy+0x40/0x230
scatterwalk_map_and_copy+0x98/0x100
crypto_ccm_encrypt+0x150/0x180
crypto_aead_encrypt+0x2c/0x40
crypt_message+0x750/0x880
smb3_init_transform_rq+0x298/0x340
smb_send_rqst.part.11+0xd8/0x180
smb_send_rqst+0x3c/0x100
compound_send_recv+0x534/0xbc0
smb2_query_info_compound+0x32c/0x440
smb2_set_ea+0x438/0x4c0
cifs_xattr_set+0x5d4/0x7c0CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.11%
- Percentil entre todas las CVEs puntuadas: 1
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/a13e51760703f71c25d5fc1f4a62dfa4b0cc80e9
- https://git.kernel.org/stable/c/bf0543b93740916ee91956f9a63da6fc0d79daaa
- https://git.kernel.org/stable/c/e8d16a54842d609fd4a3ed2d81d4333d6329aa94
- https://git.kernel.org/stable/c/e8e2861cc3258dbe407d01ea8c59bb5a53132301
- https://git.kernel.org/stable/c/f7f291e14dde32a07b1f0aa06921d28f875a7b54
- https://git.kernel.org/stable/c/fe6ea044c4f05706cb71040055b1c70c6c8275e0
JSON original (NVD)
Mostrar
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"published": "2025-09-16T17:15:33.660",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix oops during encryption\n\nWhen running xfstests against Azure the following oops occurred on an\narm64 system\n\n Unable to handle kernel write to read-only memory at virtual address\n ffff0001221cf000\n Mem abort info:\n ESR = 0x9600004f\n EC = 0x25: DABT (current EL), IL = 32 bits\n SET = 0, FnV = 0\n EA = 0, S1PTW = 0\n FSC = 0x0f: level 3 permission fault\n Data abort info:\n ISV = 0, ISS = 0x0000004f\n CM = 0, WnR = 1\n swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000294f3000\n [ffff0001221cf000] pgd=18000001ffff8003, p4d=18000001ffff8003,\n pud=18000001ff82e003, pmd=18000001ff71d003, pte=00600001221cf787\n Internal error: Oops: 9600004f [#1] PREEMPT SMP\n ...\n pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--)\n pc : __memcpy+0x40/0x230\n lr : scatterwalk_copychunks+0xe0/0x200\n sp : ffff800014e92de0\n x29: ffff800014e92de0 x28: ffff000114f9de80 x27: 0000000000000008\n x26: 0000000000000008 x25: ffff800014e92e78 x24: 0000000000000008\n x23: 0000000000000001 x22: 0000040000000000 x21: ffff000000000000\n x20: 0000000000000001 x19: ffff0001037c4488 x18: 0000000000000014\n x17: 235e1c0d6efa9661 x16: a435f9576b6edd6c x15: 0000000000000058\n x14: 0000000000000001 x13: 0000000000000008 x12: ffff000114f2e590\n x11: ffffffffffffffff x10: 0000040000000000 x9 : ffff8000105c3580\n x8 : 2e9413b10000001a x7 : 534b4410fb86b005 x6 : 534b4410fb86b005\n x5 : ffff0001221cf008 x4 : ffff0001037c4490 x3 : 0000000000000001\n x2 : 0000000000000008 x1 : ffff0001037c4488 x0 : ffff0001221cf000\n Call trace:\n __memcpy+0x40/0x230\n scatterwalk_map_and_copy+0x98/0x100\n crypto_ccm_encrypt+0x150/0x180\n crypto_aead_encrypt+0x2c/0x40\n crypt_message+0x750/0x880\n smb3_init_transform_rq+0x298/0x340\n smb_send_rqst.part.11+0xd8/0x180\n smb_send_rqst+0x3c/0x100\n compound_send_recv+0x534/0xbc0\n smb2_query_info_compound+0x32c/0x440\n smb2_set_ea+0x438/0x4c0\n cifs_xattr_set+0x5d4/0x7c0\n\nThis is because in scatterwalk_copychunks(), we attempted to write to\na buffer (@sign) that was allocated in the stack (vmalloc area) by\ncrypt_message() and thus accessing its remaining 8 (x2) bytes ended up\ncrossing a page boundary.\n\nTo simply fix it, we could just pass @sign kmalloc'd from\ncrypt_message() and then we're done. Luckily, we don't seem to pass\nany other vmalloc'd buffers in smb_rqst::rq_iov...\n\nInstead, let's map the correct pages and offsets from vmalloc buffers\nas well in cifs_sg_set_buf() and then avoiding such oopses."
}
],
"lastModified": "2026-08-04T10:18:11.943",
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