FKIE_CVE-2022-50323

Vulnerability from fkie_nvd - Published: 2025-09-15 15:15 - Updated: 2026-06-17 05:23
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: do not sense pfmemalloc status in skb_append_pagefrags() skb_append_pagefrags() is used by af_unix and udp sendpage() implementation so far. In commit 326140063946 ("tcp: TX zerocopy should not sense pfmemalloc status") we explained why we should not sense pfmemalloc status for pages owned by user space. We should also use skb_fill_page_desc_noacc() in skb_append_pagefrags() to avoid following KCSAN report: BUG: KCSAN: data-race in lru_add_fn / skb_append_pagefrags write to 0xffffea00058fc1c8 of 8 bytes by task 17319 on cpu 0: __list_add include/linux/list.h:73 [inline] list_add include/linux/list.h:88 [inline] lruvec_add_folio include/linux/mm_inline.h:323 [inline] lru_add_fn+0x327/0x410 mm/swap.c:228 folio_batch_move_lru+0x1e1/0x2a0 mm/swap.c:246 lru_add_drain_cpu+0x73/0x250 mm/swap.c:669 lru_add_drain+0x21/0x60 mm/swap.c:773 free_pages_and_swap_cache+0x16/0x70 mm/swap_state.c:311 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:256 [inline] tlb_flush_mmu+0x5b2/0x640 mm/mmu_gather.c:263 tlb_finish_mmu+0x86/0x100 mm/mmu_gather.c:363 exit_mmap+0x190/0x4d0 mm/mmap.c:3098 __mmput+0x27/0x1b0 kernel/fork.c:1185 mmput+0x3d/0x50 kernel/fork.c:1207 copy_process+0x19fc/0x2100 kernel/fork.c:2518 kernel_clone+0x166/0x550 kernel/fork.c:2671 __do_sys_clone kernel/fork.c:2812 [inline] __se_sys_clone kernel/fork.c:2796 [inline] __x64_sys_clone+0xc3/0xf0 kernel/fork.c:2796 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffffea00058fc1c8 of 8 bytes by task 17325 on cpu 1: page_is_pfmemalloc include/linux/mm.h:1817 [inline] __skb_fill_page_desc include/linux/skbuff.h:2432 [inline] skb_fill_page_desc include/linux/skbuff.h:2453 [inline] skb_append_pagefrags+0x210/0x600 net/core/skbuff.c:3974 unix_stream_sendpage+0x45e/0x990 net/unix/af_unix.c:2338 kernel_sendpage+0x184/0x300 net/socket.c:3561 sock_sendpage+0x5a/0x70 net/socket.c:1054 pipe_to_sendpage+0x128/0x160 fs/splice.c:361 splice_from_pipe_feed fs/splice.c:415 [inline] __splice_from_pipe+0x222/0x4d0 fs/splice.c:559 splice_from_pipe fs/splice.c:594 [inline] generic_splice_sendpage+0x89/0xc0 fs/splice.c:743 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:931 splice_direct_to_actor+0x305/0x620 fs/splice.c:886 do_splice_direct+0xfb/0x180 fs/splice.c:974 do_sendfile+0x3bf/0x910 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x0000000000000000 -> 0xffffea00058fc188 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 17325 Comm: syz-executor.0 Not tainted 6.1.0-rc1-syzkaller-00158-g440b7895c990-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/228ebc41dfab5b5d34cd76835ddb0ca8ee12f513Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/847a2859814b31392340a2b16604b25afaa92dccPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92b4c5c3fa810212da20088bcc6c0a77fc8607bdPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.0
linux linux_kernel 6.0
linux linux_kernel 6.0
linux linux_kernel 6.0
linux linux_kernel 6.1
linux linux_kernel 6.1
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/skbuff.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "92b4c5c3fa810212da20088bcc6c0a77fc8607bd",
              "status": "affected",
              "version": "8527c9a6bf8e54fef0a8d3d7d8874a48c725c915",
              "versionType": "git"
            },
            {
              "lessThan": "847a2859814b31392340a2b16604b25afaa92dcc",
              "status": "affected",
              "version": "3261400639463a853ba2b3be8bd009c2a8089775",
              "versionType": "git"
            },
            {
              "lessThan": "228ebc41dfab5b5d34cd76835ddb0ca8ee12f513",
              "status": "affected",
              "version": "3261400639463a853ba2b3be8bd009c2a8089775",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6730c48ed6b0cd939fc9b30b2d621ce0b89bea83",
              "versionType": "git"
            },
            {
              "lessThan": "5.15.77",
              "status": "affected",
              "version": "5.15.68",
              "versionType": "semver"
            },
            {
              "lessThan": "5.20",
              "status": "affected",
              "version": "5.19.9",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/skbuff.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.77",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F9838B2C-7013-4FA9-9A74-DDF6B426182B",
              "versionEndExcluding": "5.15.77",
              "versionStartIncluding": "5.15.68",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C642BB6C-5AE7-4FF1-BFED-4CCC8FC1E127",
              "versionEndExcluding": "6.0",
              "versionStartIncluding": "5.19.9",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8E5B300B-886E-4B07-B4A0-D7F41770FD29",
              "versionEndExcluding": "6.0.7",
              "versionStartIncluding": "6.0.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:-:*:*:*:*:*:*",
              "matchCriteriaId": "7BE551E5-89CF-47A8-9B26-03CE727FBA37",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc5:*:*:*:*:*:*",
              "matchCriteriaId": "8E5FB72F-67CE-43CC-83FE-541604D98182",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc6:*:*:*:*:*:*",
              "matchCriteriaId": "3A0A7397-F5F8-4753-82DC-9A11288E696D",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc7:*:*:*:*:*:*",
              "matchCriteriaId": "E6DE049A-ABA8-41DD-988C-8C088358EE9B",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "E7E331DA-1FB0-4DEC-91AC-7DA69D461C11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "17F0B248-42CF-4AE6-A469-BB1BAE7F4705",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not sense pfmemalloc status in skb_append_pagefrags()\n\nskb_append_pagefrags() is used by af_unix and udp sendpage()\nimplementation so far.\n\nIn commit 326140063946 (\"tcp: TX zerocopy should not sense\npfmemalloc status\") we explained why we should not sense\npfmemalloc status for pages owned by user space.\n\nWe should also use skb_fill_page_desc_noacc()\nin skb_append_pagefrags() to avoid following KCSAN report:\n\nBUG: KCSAN: data-race in lru_add_fn / skb_append_pagefrags\n\nwrite to 0xffffea00058fc1c8 of 8 bytes by task 17319 on cpu 0:\n__list_add include/linux/list.h:73 [inline]\nlist_add include/linux/list.h:88 [inline]\nlruvec_add_folio include/linux/mm_inline.h:323 [inline]\nlru_add_fn+0x327/0x410 mm/swap.c:228\nfolio_batch_move_lru+0x1e1/0x2a0 mm/swap.c:246\nlru_add_drain_cpu+0x73/0x250 mm/swap.c:669\nlru_add_drain+0x21/0x60 mm/swap.c:773\nfree_pages_and_swap_cache+0x16/0x70 mm/swap_state.c:311\ntlb_batch_pages_flush mm/mmu_gather.c:59 [inline]\ntlb_flush_mmu_free mm/mmu_gather.c:256 [inline]\ntlb_flush_mmu+0x5b2/0x640 mm/mmu_gather.c:263\ntlb_finish_mmu+0x86/0x100 mm/mmu_gather.c:363\nexit_mmap+0x190/0x4d0 mm/mmap.c:3098\n__mmput+0x27/0x1b0 kernel/fork.c:1185\nmmput+0x3d/0x50 kernel/fork.c:1207\ncopy_process+0x19fc/0x2100 kernel/fork.c:2518\nkernel_clone+0x166/0x550 kernel/fork.c:2671\n__do_sys_clone kernel/fork.c:2812 [inline]\n__se_sys_clone kernel/fork.c:2796 [inline]\n__x64_sys_clone+0xc3/0xf0 kernel/fork.c:2796\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nread to 0xffffea00058fc1c8 of 8 bytes by task 17325 on cpu 1:\npage_is_pfmemalloc include/linux/mm.h:1817 [inline]\n__skb_fill_page_desc include/linux/skbuff.h:2432 [inline]\nskb_fill_page_desc include/linux/skbuff.h:2453 [inline]\nskb_append_pagefrags+0x210/0x600 net/core/skbuff.c:3974\nunix_stream_sendpage+0x45e/0x990 net/unix/af_unix.c:2338\nkernel_sendpage+0x184/0x300 net/socket.c:3561\nsock_sendpage+0x5a/0x70 net/socket.c:1054\npipe_to_sendpage+0x128/0x160 fs/splice.c:361\nsplice_from_pipe_feed fs/splice.c:415 [inline]\n__splice_from_pipe+0x222/0x4d0 fs/splice.c:559\nsplice_from_pipe fs/splice.c:594 [inline]\ngeneric_splice_sendpage+0x89/0xc0 fs/splice.c:743\ndo_splice_from fs/splice.c:764 [inline]\ndirect_splice_actor+0x80/0xa0 fs/splice.c:931\nsplice_direct_to_actor+0x305/0x620 fs/splice.c:886\ndo_splice_direct+0xfb/0x180 fs/splice.c:974\ndo_sendfile+0x3bf/0x910 fs/read_write.c:1255\n__do_sys_sendfile64 fs/read_write.c:1323 [inline]\n__se_sys_sendfile64 fs/read_write.c:1309 [inline]\n__x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1309\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nvalue changed: 0x0000000000000000 -\u003e 0xffffea00058fc188\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 1 PID: 17325 Comm: syz-executor.0 Not tainted 6.1.0-rc1-syzkaller-00158-g440b7895c990-dirty #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022"
    }
  ],
  "id": "CVE-2022-50323",
  "lastModified": "2026-06-17T05:23:14.110",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-09-15T15:15:44.357",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/228ebc41dfab5b5d34cd76835ddb0ca8ee12f513"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/847a2859814b31392340a2b16604b25afaa92dcc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/92b4c5c3fa810212da20088bcc6c0a77fc8607bd"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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