CVE-2022-50341 (GCVE-0-2022-50341)
Vulnerability from cvelistv5 – Published: 2025-09-16 16:11 – Updated: 2026-01-14 18:22
VLAI?
Title
cifs: fix oops during encryption
Summary
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
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+0x5d4/0x7c0
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.
Severity ?
5.5 (Medium)
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 , < e8e2861cc3258dbe407d01ea8c59bb5a53132301
(git)
Affected: 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 , < fe6ea044c4f05706cb71040055b1c70c6c8275e0 (git) Affected: 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 , < bf0543b93740916ee91956f9a63da6fc0d79daaa (git) Affected: 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 , < a13e51760703f71c25d5fc1f4a62dfa4b0cc80e9 (git) Affected: 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 , < e8d16a54842d609fd4a3ed2d81d4333d6329aa94 (git) Affected: 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 , < f7f291e14dde32a07b1f0aa06921d28f875a7b54 (git) |
|||||||
|
|||||||||
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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\u0027d from\\ncrypt_message() and then we\u0027re done. Luckily, we don\u0027t seem to pass\\nany other vmalloc\u0027d buffers in smb_rqst::rq_iov...\\n\\nInstead, let\u0027s map the correct pages and offsets from vmalloc buffers\\nas well in cifs_sg_set_buf() and then avoiding such oopses.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.229\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.163\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.87\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.16\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.1\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"4.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-23T13:28:46.032Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2022-50341\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-14T18:22:57.726Z\", \"dateReserved\": \"2025-09-16T16:03:27.881Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-16T16:11:20.838Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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