{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50341", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-16T16:03:27.881Z", "datePublished": "2025-09-16T16:11:20.838Z", "dateUpdated": "2026-08-05T08:58:18.553Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:18.553Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - This is CIFS/SMB3 client encryption in fs/cifs, reached via local filesystem operations on an already-mounted share, not a network-facing server like ksmbd/nfsd.\nAC:L - An attacker with access to an encrypted SMB3 mount can repeatedly issue operations that encrypt (or decrypt) messages; VMAP_STACK is default on x86_64/arm64, and the page-boundary condition is reliably hittable (as in the reported xfstests oops), including via retries under kstack offset randomization.\nPR:L - An unprivileged local user who can access a mounted encrypted CIFS/SMB3 share (common for Azure Files and enterprise mounts) can trigger the path via setxattr or other ordinary filesystem operations without root.\nUI:N - The attacker themselves performs the filesystem operation that drives encryption; no separate victim action is required beyond the pre-existing encrypted mount.\nS:U - The corruption and crash stay within the local kernel’s security authority; this is not a VM/IOMMU/sandbox boundary crossing.\nC:H - The flaw is an out-of-bounds write into an unintended kernel page via scatterwalk’s page+1 advance on a mis-mapped vmalloc buffer, which is memory corruption that can be leveraged for information disclosure.\nI:H - scatterwalk writes the AEAD signature across a page boundary into the wrong page frame (sg_page+1), which is an out-of-bounds kernel write exploitable for integrity compromise and control-flow hijacking.\nA:H - The bug produces a demonstrable kernel oops (write to read-only memory during crypto_ccm_encrypt), so availability impact is High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/cifs/cifsglob.h", "fs/cifs/cifsproto.h", "fs/cifs/misc.c", "fs/cifs/smb2ops.c" ], "versions": [ { "version": "026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398", "lessThan": "e8e2861cc3258dbe407d01ea8c59bb5a53132301", "status": "affected", "versionType": "git" }, { "version": "026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398", "lessThan": "fe6ea044c4f05706cb71040055b1c70c6c8275e0", "status": "affected", "versionType": "git" }, { "version": "026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398", "lessThan": "bf0543b93740916ee91956f9a63da6fc0d79daaa", "status": "affected", "versionType": "git" }, { "version": "026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398", "lessThan": "a13e51760703f71c25d5fc1f4a62dfa4b0cc80e9", "status": "affected", "versionType": "git" }, { "version": "026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398", "lessThan": "e8d16a54842d609fd4a3ed2d81d4333d6329aa94", "status": "affected", "versionType": "git" }, { "version": "026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398", "lessThan": "f7f291e14dde32a07b1f0aa06921d28f875a7b54", "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/cifs/cifsglob.h", "fs/cifs/cifsproto.h", "fs/cifs/misc.c", "fs/cifs/smb2ops.c" ], "versions": [ { "version": "4.11", "status": "affected" }, { "version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.87", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.16", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.1", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "4.11", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.15.87" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.0.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.1.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e8e2861cc3258dbe407d01ea8c59bb5a53132301" }, { "url": "https://git.kernel.org/stable/c/fe6ea044c4f05706cb71040055b1c70c6c8275e0" }, { "url": "https://git.kernel.org/stable/c/bf0543b93740916ee91956f9a63da6fc0d79daaa" }, { "url": "https://git.kernel.org/stable/c/a13e51760703f71c25d5fc1f4a62dfa4b0cc80e9" }, { "url": "https://git.kernel.org/stable/c/e8d16a54842d609fd4a3ed2d81d4333d6329aa94" }, { "url": "https://git.kernel.org/stable/c/f7f291e14dde32a07b1f0aa06921d28f875a7b54" } ], "title": "cifs: fix oops during encryption", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-50341", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T18:19:48.496611Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T18:22:57.726Z" } } ] } }