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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix OOB reads parsing symlink error response\n\nWhen a CREATE returns STATUS_STOPPED_ON_SYMLINK, smb2_check_message()\nreturns success without any length validation, leaving the symlink\nparsers as the only defense against an untrusted server.\n\nsymlink_data() walks SMB 3.1.1 error contexts with the loop test \"p \u003c\nend\", but reads p-\u003eErrorId at offset 4 and p-\u003eErrorDataLength at offset\n0.  When the server-controlled ErrorDataLength advances p to within 1-7\nbytes of end, the next iteration will read past it.  When the matching\ncontext is found, sym-\u003eSymLinkErrorTag is read at offset 4 from\np-\u003eErrorContextData with no check that the symlink header itself fits.\n\nsmb2_parse_symlink_response() then bounds-checks the substitute name\nusing SMB2_SYMLINK_STRUCT_SIZE as the offset of PathBuffer from\niov_base.  That value is computed as sizeof(smb2_err_rsp) +\nsizeof(smb2_symlink_err_rsp), which is correct only when\nErrorContextCount == 0.\n\nWith at least one error context the symlink data sits 8 bytes deeper,\nand each skipped non-matching context shifts it further by 8 +\nALIGN(ErrorDataLength, 8).  The check is too short, allowing the\nsubstitute name read to run past iov_len.  The out-of-bound heap bytes\nare UTF-16-decoded into the symlink target and returned to userspace via\nreadlink(2).\n\nFix this all up by making the loops test require the full context header\nto fit, rejecting sym if its header runs past end, and bound the\nsubstitute name against the actual position of sym-\u003ePathBuffer rather\nthan a fixed offset.\n\nBecause sub_offs and sub_len are 16bits, the pointer math will not\noverflow here with the new greater-than."
        }
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
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              "value": "AV:N - The crafted data is delivered over SMB by a remote SMB server in response to client CREATE/path-info operations. A malicious server can trigger the parser once the victim connects to or uses the share.\nAC:L - The attacker controls the relevant SMB error context fields, offsets, and lengths in a single response. No race or condition outside attacker control is required.\nPR:N - The attacker needs no privileges on the victim system; they only need to operate or impersonate the SMB server endpoint. SMB session setup is victim-side interaction, not attacker privilege.\nUI:R - A victim must mount/connect to the SMB share or access a path on an already-mounted share. The server cannot trigger the vulnerable client path without such client activity.\nS:U - The bug affects the kernel SMB client and exposes or disrupts resources within the same client security authority. It does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The malformed symlink error response can make kernel heap bytes past the received SMB buffer get UTF-16 decoded into the symlink target and returned to userspace. The over-read is not strictly limited to only a few bytes in the error-context case.\nI:N - The bug is an out-of-bounds read, not a write or control-flow primitive. The malicious server already controls symlink response contents, so this adds disclosure and possible crash impact rather than data modification.\nA:H - The unchecked over-read occurs in kernel parsing/conversion paths and can read beyond the allocated receive buffer, which can fault or oops the kernel. A malicious server can also repeatedly trigger the malformed response when the client accesses the path."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
        {
          "url": "https://git.kernel.org/stable/c/3df690bba28edec865cf7190be10708ad0ddd67e"
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      "title": "smb: client: fix OOB reads parsing symlink error response",
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    "dateReserved": "2026-03-09T15:48:24.123Z",
    "dateUpdated": "2026-08-05T12:23:51.182Z",
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        {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp: Don\u0027t attempt to copy ID to userspace if PSP command failed\n\nWhen retrieving the ID for the CPU, don\u0027t attempt to copy the ID blob to\nuserspace if the firmware command failed.  If the failure was due to an\ninvalid length, i.e. the userspace buffer+length was too small, copying\nthe number of bytes _firmware_ requires will overflow the kernel-allocated\nbuffer and leak data to userspace.\n\n  BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n  BUG: KASAN: slab-out-of-bounds in _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n  BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n  Read of size 64 at addr ffff8881867f5960 by task syz.0.906/24388\n\n  CPU: 130 UID: 0 PID: 24388 Comm: syz.0.906 Tainted: G     U     O        7.0.0-smp-DEV #28 PREEMPTLAZY\n  Tainted: [U]=USER, [O]=OOT_MODULE\n  Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0xc5/0x110 ../lib/dump_stack.c:120\n   print_address_description ../mm/kasan/report.c:378 [inline]\n   print_report+0xbc/0x260 ../mm/kasan/report.c:482\n   kasan_report+0xa2/0xe0 ../mm/kasan/report.c:595\n   check_region_inline ../mm/kasan/generic.c:-1 [inline]\n   kasan_check_range+0x264/0x2c0 ../mm/kasan/generic.c:200\n   instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n   _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n   _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n   copy_to_user ../include/linux/uaccess.h:236 [inline]\n   sev_ioctl_do_get_id2+0x361/0x490 ../drivers/crypto/ccp/sev-dev.c:2222\n   sev_ioctl+0x25f/0x490 ../drivers/crypto/ccp/sev-dev.c:2575\n   vfs_ioctl ../fs/ioctl.c:51 [inline]\n   __do_sys_ioctl ../fs/ioctl.c:597 [inline]\n   __se_sys_ioctl+0x11d/0x1b0 ../fs/ioctl.c:583\n   do_syscall_x64 ../arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0xe0/0x800 ../arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n   \u003c/TASK\u003e\n\nWARN if the driver says the command succeeded, but the firmware error code\nsays otherwise, as __sev_do_cmd_locked() is expected to return -EIO on any\nfirwmware error."
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              "value": "AV:L - The vulnerable path is reached through a local ioctl on the host `/dev/sev` misc device using `SEV_ISSUE_CMD` with `SEV_GET_ID2`; it is not reachable from network packets or from SEV guests.\nAC:L - The attacker controls the supplied buffer length and can reliably make firmware return an invalid-length error that updates `data.len` beyond the allocated buffer size. No race or uncontrollable heap condition is required to trigger the out-of-bounds copy.\nPR:L - Access requires permission to open `/dev/sev`, which defaults restrictive but is reasonably granted to non-root virtualization users or service accounts via device policy. The ioctl command itself has no capability check and `SEV_GET_ID2` does not require write access.\nUI:N - Once the attacker has local access to the device node, exploitation is a direct ioctl call. No victim action is required.\nS:U - The vulnerability is in the host kernel SEV/PSP driver and impacts host kernel memory and availability within the same security authority. It is not a guest-to-host escape or IOMMU/DMA boundary bypass.\nC:H - The bug copies firmware-reported length bytes from a smaller `kzalloc()` buffer to userspace, leaking adjacent kernel heap memory. Under the requested high-severity tie-break rule, this out-of-bounds kernel read is High confidentiality impact.\nI:N - The flawed operation is an over-read from kernel memory during `copy_to_user()`. It does not write to kernel memory or provide a demonstrated data-modification primitive.\nA:H - The same out-of-bounds usercopy can trigger kernel hardening or sanitizer failures, and hardened usercopy aborts such invalid slab exposures with a BUG. This makes a kernel crash reasonably defensible."
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp: Don\u0027t attempt to copy PDH cert to userspace if PSP command failed\n\nWhen retrieving the PDH cert, don\u0027t attempt to copy the blobs to userspace\nif the firmware command failed.  If the failure was due to an invalid\nlength, i.e. the userspace buffer+length was too small, copying the number\nof bytes _firmware_ requires will overflow the kernel-allocated buffer and\nleak data to userspace.\n\n  BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n  BUG: KASAN: slab-out-of-bounds in _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n  BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n  Read of size 2084 at addr ffff8885c4ab8aa0 by task syz.0.186/21033\n\n  CPU: 51 UID: 0 PID: 21033 Comm: syz.0.186 Tainted: G     U     O        7.0.0-smp-DEV #28 PREEMPTLAZY\n  Tainted: [U]=USER, [O]=OOT_MODULE\n  Hardware name: Google, Inc.                                                       Arcadia_IT_80/Arcadia_IT_80, BIOS 34.84.12-0 11/17/2025\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0xc5/0x110 ../lib/dump_stack.c:120\n   print_address_description ../mm/kasan/report.c:378 [inline]\n   print_report+0xbc/0x260 ../mm/kasan/report.c:482\n   kasan_report+0xa2/0xe0 ../mm/kasan/report.c:595\n   check_region_inline ../mm/kasan/generic.c:-1 [inline]\n   kasan_check_range+0x264/0x2c0 ../mm/kasan/generic.c:200\n   instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n   _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n   _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n   copy_to_user ../include/linux/uaccess.h:236 [inline]\n   sev_ioctl_do_pdh_export+0x3d3/0x7c0 ../drivers/crypto/ccp/sev-dev.c:2347\n   sev_ioctl+0x2a2/0x490 ../drivers/crypto/ccp/sev-dev.c:2568\n   vfs_ioctl ../fs/ioctl.c:51 [inline]\n   __do_sys_ioctl ../fs/ioctl.c:597 [inline]\n   __se_sys_ioctl+0x11d/0x1b0 ../fs/ioctl.c:583\n   do_syscall_x64 ../arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0xe0/0x800 ../arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n   \u003c/TASK\u003e\n\nWARN if the driver says the command succeeded, but the firmware error code\nsays otherwise, as __sev_do_cmd_locked() is expected to return -EIO on any\nfirwmware error."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
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          "scenarios": [
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              "value": "AV:L - The vulnerable code is reached through the local `/dev/sev` misc device via the `SEV_ISSUE_CMD` ioctl and `SEV_PDH_CERT_EXPORT` command, not by network or adjacent packets.\nAC:L - An attacker who can access `/dev/sev` can supply undersized nonzero certificate buffers and reliably make firmware return the required larger lengths; no race or hard-to-influence condition is required.\nPR:L - The kernel path has no capability check, and although `/dev/sev` is often root-restricted by default, SEV-capable hosts commonly delegate access to non-root virtualization users or groups; using the higher-severity reasonable case makes this low privileges.\nUI:N - No victim action is required after the attacker has local access to the device; the ioctl directly triggers the vulnerable path.\nS:U - The bug leaks or crashes kernel memory in the same host kernel security authority; it is not a VM escape or other cross-scope boundary violation by itself.\nC:H - The failed firmware command overwrites the returned lengths with larger required sizes, and the vulnerable code copies that many bytes from smaller kernel heap buffers to userspace, producing an out-of-bounds kernel memory disclosure.\nI:N - The bug is an out-of-bounds read during `copy_to_user`, with no direct write, memory corruption, or control-flow modification primitive.\nA:H - The same out-of-bounds usercopy is reported as a KASAN slab-out-of-bounds read and can also trip hardened usercopy BUG/oops paths on hardened kernels, making a kernel crash a defensible impact."
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        "dateUpdated": "2026-08-05T12:24:35.659Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
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          "url": "https://git.kernel.org/stable/c/b5c14bd4da1f376f385722fe1da993f1edab6472"
        },
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          "url": "https://git.kernel.org/stable/c/78b97e43d0b3e674d9d49ae56937b11e2ba3fcaf"
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        },
        {
          "url": "https://git.kernel.org/stable/c/e76239fed3cffd6d304d8ca3ce23984fd24f57d3"
        }
      ],
      "title": "crypto: ccp: Don\u0027t attempt to copy PDH cert to userspace if PSP command failed",
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    "cveId": "CVE-2026-31698",
    "datePublished": "2026-05-01T13:55:58.854Z",
    "dateReserved": "2026-03-09T15:48:24.131Z",
    "dateUpdated": "2026-08-05T12:24:35.659Z",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp: Don\u0027t attempt to copy CSR to userspace if PSP command failed\n\nWhen retrieving the PEK CSR, don\u0027t attempt to copy the blob to userspace\nif the firmware command failed.  If the failure was due to an invalid\nlength, i.e. the userspace buffer+length was too small, copying the number\nof bytes _firmware_ requires will overflow the kernel-allocated buffer and\nleak data to userspace.\n\n  BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n  BUG: KASAN: slab-out-of-bounds in _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n  BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n  Read of size 2084 at addr ffff898144612e20 by task syz.9.219/21405\n\n  CPU: 14 UID: 0 PID: 21405 Comm: syz.9.219 Tainted: G     U     O        7.0.0-smp-DEV #28 PREEMPTLAZY\n  Tainted: [U]=USER, [O]=OOT_MODULE\n  Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0xc5/0x110 ../lib/dump_stack.c:120\n   print_address_description ../mm/kasan/report.c:378 [inline]\n   print_report+0xbc/0x260 ../mm/kasan/report.c:482\n   kasan_report+0xa2/0xe0 ../mm/kasan/report.c:595\n   check_region_inline ../mm/kasan/generic.c:-1 [inline]\n   kasan_check_range+0x264/0x2c0 ../mm/kasan/generic.c:200\n   instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n   _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n   _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n   copy_to_user ../include/linux/uaccess.h:236 [inline]\n   sev_ioctl_do_pek_csr+0x31f/0x590 ../drivers/crypto/ccp/sev-dev.c:1872\n   sev_ioctl+0x3a4/0x490 ../drivers/crypto/ccp/sev-dev.c:2562\n   vfs_ioctl ../fs/ioctl.c:51 [inline]\n   __do_sys_ioctl ../fs/ioctl.c:597 [inline]\n   __se_sys_ioctl+0x11d/0x1b0 ../fs/ioctl.c:583\n   do_syscall_x64 ../arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0xe0/0x800 ../arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n   \u003c/TASK\u003e\n\nWARN if the driver says the command succeeded, but the firmware error code\nsays otherwise, as __sev_do_cmd_locked() is expected to return -EIO on any\nfirwmware error."
        }
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              "value": "AV:L - The vulnerable code is reached through a local `ioctl(SEV_ISSUE_CMD)` on the `/dev/sev` misc character device with the `SEV_PEK_CSR` subcommand, not through a network or adjacent interface.\nAC:L - An attacker who can issue the ioctl can reliably trigger the bug by providing a CSR buffer length that is too small, causing firmware to return the required larger length. No race or condition outside the attacker\u0027s control is required.\nPR:L - The path requires write access to `/dev/sev`; the driver does not enforce a capability check, and reasonable SEV management deployments may delegate writable device access to non-root service or management accounts. Under the required higher-severity rule, this is scored as low privileges rather than root-only.\nUI:N - The attacker directly opens the device and issues the ioctl. No separate victim action is required.\nS:U - The bug affects kernel memory from a local kernel device interface within the same host security scope. It is not a VM escape, IOMMU bypass, or cross-authority boundary change.\nC:H - The old code copied the firmware-reported required CSR length from a smaller `kzalloc()` buffer, producing a slab out-of-bounds read into userspace. This can leak adjacent kernel heap data and is not limited to only a few bytes.\nI:N - The vulnerability is an out-of-bounds read during `copy_to_user()`, with no kernel memory write or direct control-flow corruption. It does not directly provide an integrity impact.\nA:H - The out-of-bounds usercopy is shown to trigger a KASAN slab-out-of-bounds BUG, and hardened/debug configurations can turn the invalid exposure into an oops or panic. It can be triggered repeatedly by issuing the ioctl again."
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      "title": "crypto: ccp: Don\u0027t attempt to copy CSR to userspace if PSP command failed",
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