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CVE-2022-50295 (GCVE-0-2022-50295)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:45 – Updated: 2026-05-11 19:16
VLAI
Title
io_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd()
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd() Syzkaller produced the below call trace: BUG: KASAN: null-ptr-deref in io_msg_ring+0x3cb/0x9f0 Write of size 8 at addr 0000000000000070 by task repro/16399 CPU: 0 PID: 16399 Comm: repro Not tainted 6.1.0-rc1 #28 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 Call Trace: <TASK> dump_stack_lvl+0xcd/0x134 ? io_msg_ring+0x3cb/0x9f0 kasan_report+0xbc/0xf0 ? io_msg_ring+0x3cb/0x9f0 kasan_check_range+0x140/0x190 io_msg_ring+0x3cb/0x9f0 ? io_msg_ring_prep+0x300/0x300 io_issue_sqe+0x698/0xca0 io_submit_sqes+0x92f/0x1c30 __do_sys_io_uring_enter+0xae4/0x24b0 .... RIP: 0033:0x7f2eaf8f8289 RSP: 002b:00007fff40939718 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2eaf8f8289 RDX: 0000000000000000 RSI: 0000000000006f71 RDI: 0000000000000004 RBP: 00007fff409397a0 R08: 0000000000000000 R09: 0000000000000039 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004006d0 R13: 00007fff40939880 R14: 0000000000000000 R15: 0000000000000000 </TASK> Kernel panic - not syncing: panic_on_warn set ... We don't have a NULL check on file_ptr in io_msg_send_fd() function, so when file_ptr is NUL src_file is also NULL and get_file() dereferences a NULL pointer and leads to above crash. Add a NULL check to fix this issue.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e6130eba8a848a7a6ba6c534bd8f6d60749ae1a9 , < 0163e04ea64cc3dfaa12390286e5f2f481c3b2e3 (git)
Affected: e6130eba8a848a7a6ba6c534bd8f6d60749ae1a9 , < 16bbdfe5fb0e78e0acb13e45fc127e9a296913f2 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.0.6 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd()\n\nSyzkaller produced the below call trace:\n\n BUG: KASAN: null-ptr-deref in io_msg_ring+0x3cb/0x9f0\n Write of size 8 at addr 0000000000000070 by task repro/16399\n\n CPU: 0 PID: 16399 Comm: repro Not tainted 6.1.0-rc1 #28\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0xcd/0x134\n  ? io_msg_ring+0x3cb/0x9f0\n  kasan_report+0xbc/0xf0\n  ? io_msg_ring+0x3cb/0x9f0\n  kasan_check_range+0x140/0x190\n  io_msg_ring+0x3cb/0x9f0\n  ? io_msg_ring_prep+0x300/0x300\n  io_issue_sqe+0x698/0xca0\n  io_submit_sqes+0x92f/0x1c30\n  __do_sys_io_uring_enter+0xae4/0x24b0\n....\n RIP: 0033:0x7f2eaf8f8289\n RSP: 002b:00007fff40939718 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa\n RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2eaf8f8289\n RDX: 0000000000000000 RSI: 0000000000006f71 RDI: 0000000000000004\n RBP: 00007fff409397a0 R08: 0000000000000000 R09: 0000000000000039\n R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004006d0\n R13: 00007fff40939880 R14: 0000000000000000 R15: 0000000000000000\n  \u003c/TASK\u003e\n Kernel panic - not syncing: panic_on_warn set ...\n\nWe don\u0027t have a NULL check on file_ptr in io_msg_send_fd() function,\nso when file_ptr is NUL src_file is also NULL and get_file()\ndereferences a NULL pointer and leads to above crash.\n\nAdd a NULL check to fix this issue."
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}



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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

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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.


Detection rules are retrieved from Rulezet.


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