CVE-2022-50635

UNRATEDCVSS · not yet scored

Also known asEUVD-2022-55721 (ENISA EUVD) · GHSA-3rmf-xhh6-vpwj (GitHub Security Advisories)Source: ENISA EUVD

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EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS v2: —Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

powerpc/kprobes: Fix null pointer reference in arch_prepare_kprobe()

I found a null pointer reference in arch_prepare_kprobe():

# echo 'p cmdline_proc_show' > kprobe_events # echo 'p cmdline_proc_show+16' >> kprobe_events Kernel attempted to read user page (0) - exploit attempt? (uid: 0) BUG: Kernel NULL pointer dereference on read at 0x00000000 Faulting instruction address: 0xc000000000050bfc Oops: Kernel access of bad area, sig: 11 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 122 Comm: sh Not tainted 6.0.0-rc3-00007-gdcf8e5633e2e #10 NIP: c000000000050bfc LR: c000000000050bec CTR: 0000000000005bdc REGS: c0000000348475b0 TRAP: 0300 Not tainted (6.0.0-rc3-00007-gdcf8e5633e2e) MSR: 9000000000009033 CR: 88002444 XER: 20040006 CFAR: c00000000022d100 DAR: 0000000000000000 DSISR: 40000000 IRQMASK: 0 ... NIP arch_prepare_kprobe+0x10c/0x2d0 LR arch_prepare_kprobe+0xfc/0x2d0 Call Trace: 0xc0000000012f77a0 (unreliable) register_kprobe+0x3c0/0x7a0 __register_trace_kprobe+0x140/0x1a0 __trace_kprobe_create+0x794/0x1040 trace_probe_create+0xc4/0xe0 create_or_delete_trace_kprobe+0x2c/0x80 trace_parse_run_command+0xf0/0x210 probes_write+0x20/0x40 vfs_write+0xfc/0x450 ksys_write+0x84/0x140 system_call_exception+0x17c/0x3a0 system_call_vectored_common+0xe8/0x278 --- interrupt: 3000 at 0x7fffa5682de0 NIP: 00007fffa5682de0 LR: 0000000000000000 CTR: 0000000000000000 REGS: c000000034847e80 TRAP: 3000 Not tainted (6.0.0-rc3-00007-gdcf8e5633e2e) MSR: 900000000280f033 CR: 44002408 XER: 00000000

The address being probed has some special:

cmdline_proc_show: Probe based on ftrace cmdline_proc_show+16: Probe for the next instruction at the ftrace location

The ftrace-based kprobe does not generate kprobe::ainsn::insn, it gets set to NULL. In arch_prepare_kprobe() it will check for:

... prev = get_kprobe(p->addr - 1); preempt_enable_no_resched(); if (prev && ppc_inst_prefixed(ppc_inst_read(prev->ainsn.insn))) { ...

If prev is based on ftrace, 'ppc_inst_read(prev->ainsn.insn)' will occur with a null pointer reference. At this point prev->addr will not be a prefixed instruction, so the check can be skipped.

Check if prev is ftrace-based kprobe before reading 'prev->ainsn.insn' to fix this problem.

[mpe: Trim oops]

CVSS
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EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
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EPSS PROB
0.2%
EPSS %ILE
12th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

EG Severity
Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-09). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
No SSVC decision: EchelonGraph has not assessed this CVECISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the BOD 26-04 block below.

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 9, 2025

Last Modified

November 10, 2026

References (4)

Vendor Advisories for CVE-2022-50635(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkernel-0:4.18.0-553.el8_102024-05-22redhat
redhatkernel-0:5.14.0-284.11.1.el9_22023-05-09redhat
linuxKernel @ 5.15.75 (fixes >=5.8.0)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)
  • every version on: no fix on record
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Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.0.3-1: fixed in 6.0.3-1
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Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.0.3-1: fixed in 6.0.3-1
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Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.0.3-1: fixed in 6.0.3-1
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Data Freshness Timeline

(refreshed 9× in last 7d / 34× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 253 rows on record for this CVE, as 99 entries (1 repeat merged).

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 153 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-14 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  2. 2026-11-13 16:43 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-11-12 16:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  4. 2026-11-11 16:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  5. 2026-11-10 16:36 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  6. 2026-11-10 12:30 UTCEchelonGraph re-scored
  7. 2026-11-10 12:30 UTCVendor advisory
  8. 2026-11-10 12:30 UTCGHSA enrichmentGHSA-3rmf-xhh6-vpwj
  9. 2026-11-09 16:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  10. 2026-11-08 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
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  12. 2026-11-06 16:31 UTCEPSS rescoreEPSS 0.2% · 10th percentile
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  16. 2026-11-02 16:39 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  17. 2026-11-01 16:30 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  18. 2026-10-31 16:29 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  19. 2026-10-30 16:31 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  20. 2026-10-29 16:30 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  21. 2026-10-28 16:28 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  22. 2026-10-27 16:28 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  23. 2026-10-27 10:44 UTCEchelonGraph re-scored
  24. 2026-10-27 10:44 UTCVendor advisory
  25. 2026-10-27 10:44 UTCGHSA enrichmentGHSA-3rmf-xhh6-vpwj
Show 74 more
  1. 2026-10-26 16:28 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  2. 2026-10-25 17:53 UTCEchelonGraph re-scored
  3. 2026-10-25 16:29 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  4. 2026-10-24 22:25 UTCOSV refresh
  5. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  6. 2026-10-23 16:29 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  7. 2026-10-22 16:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
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  9. 2026-10-20 16:29 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  10. 2026-10-19 16:28 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  11. 2026-10-18 08:18 UTCEchelonGraph re-scored
  12. 2026-10-17 16:29 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  13. 2026-10-16 16:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  14. 2026-10-15 16:28 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  15. 2026-10-14 16:29 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  16. 2026-10-13 16:29 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  17. 2026-10-12 18:40 UTCEchelonGraph re-scored
  18. 2026-10-12 16:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  19. 2026-10-11 22:04 UTCEchelonGraph re-scored
  20. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  21. 2026-10-10 19:57 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  22. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.2% · 9th percentile
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  27. 2026-10-04 23:19 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  28. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  29. 2026-10-01 04:10 UTCOSV refresh
  30. 2026-09-30 16:13 UTCEchelonGraph re-scored
  31. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  32. 2026-09-27 13:42 UTCEPSS rescoreEPSS 0.2% · 9th percentile
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  41. 2026-09-13 16:44 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  42. 2026-09-12 06:40 UTCOSV refresh
  43. 2026-09-11 14:50 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  44. 2026-09-11 09:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  45. 2026-09-08 21:57 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  46. 2026-09-07 15:59 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  47. 2026-09-06 13:45 UTCEPSS rescoreEPSS 0.2% · 10th percentile
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  50. 2026-09-04 05:04 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  51. 2026-09-02 14:09 UTCEPSS rescoreEPSS 0.2% · 9th percentile
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  53. 2026-08-30 19:15 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  54. 2026-08-30 01:19 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  55. 2026-08-28 21:38 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  56. 2026-08-27 14:22 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  57. 2026-08-26 14:43 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  58. 2026-08-24 12:00 UTCOSV refresh
  59. 2026-08-23 00:17 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  60. 2026-08-21 23:46 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  61. 2026-08-20 22:53 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  62. 2026-08-19 17:01 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  63. 2026-08-18 13:45 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  64. 2026-08-17 13:44 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  65. 2026-08-16 14:53 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  66. 2026-08-16 02:12 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  67. 2026-08-15 01:27 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  68. 2026-08-13 21:58 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  69. 2026-08-12 13:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  70. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  71. 2026-08-08 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  72. 2026-08-08 08:07 UTCEchelonGraph re-scored
  73. 2026-08-08 08:07 UTCVendor advisory
  74. 2026-08-08 08:07 UTCGHSA enrichmentGHSA-3rmf-xhh6-vpwj

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2022-50635?
CVE-2022-50635 is a vulnerability whose severity is not yet rated; its CVE record was published on December 9, 2025. In the Linux kernel, the following vulnerability has been resolved: powerpc/kprobes: Fix null pointer reference in arch_prepare_kprobe() I found a null pointer reference in arch_prepare_kprobe(): echo 'p cmdline_proc_show' > kprobe_events echo 'p cmdline_proc_show+16' >> kprobe_events Kernel…
When was the CVE record for CVE-2022-50635 published?
The CVE record for CVE-2022-50635 was published on December 9, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 10, 2026; the record at its source may have been updated since.
Is CVE-2022-50635 actively exploited?
CVE-2022-50635 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-scored CVEs).
How do I remediate CVE-2022-50635?
A fix for CVE-2022-50635 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2022-50635 are linked in the Vendor Advisories panel on this page.

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