CVE-2022-50341 (GCVE-0-2022-50341)

Vulnerability from cvelistv5 – Published: 2025-09-16 16:11 – Updated: 2026-08-05 08:58
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:19 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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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Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.87 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.1 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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          }
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            }
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                  "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\u2019s 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\u2019s 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."
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            {
              "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"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-50341",
        "datePublished": "2025-09-16T16:11:20.838Z",
        "dateReserved": "2025-09-16T16:03:27.881Z",
        "dateUpdated": "2026-08-05T08:58:18.553Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.