CVE-2022-48949

Host stack disclosure via uninitialized reset message

Published Oct 21, 2024 · Updated May 11, 2026

Information disclosure in the Linux kernel's igb driver allows guest OS users to read host stack data through a VF reset response. The PF-side VF-reset handler allocates its mailbox message on the stack but leaves the MAC-address words uninitialized when no MAC address is assigned, then sends those stale bytes to the VF. Exploitation requires an SR-IOV virtual function using the igb path and exposes residual host-kernel stack contents to the guest without altering data or interrupting service.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux kernel's igb driver allows guest OS users to read host stack data through a VF reset response. The PF-side VF-reset handler allocates its mailbox message on the stack but leaves the MAC-address words uninitialized when no MAC address is assigned, then sends those stale bytes to the VF. Exploitation requires an SR-IOV virtual function using the igb path and exposes residual host-kernel stack contents to the guest without altering data or interrupting service.

The record

CVE
CVE-2022-48949
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0
  2. Affected versionversion=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <367e1e3399dbc56fc669740c4ab60e35da632b0e
  3. Affected versionversion=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <51fd5ede7ed42f272682a0c33d6f0767b3484a3d
  4. Affected versionversion=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <a6629659af3f5c6a91e3914ea62554c975ab77f4
  5. Affected versionversion=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <c383c7c35c7bc15e07a04eefa060a8a80cbeae29
  6. Affected versionversion=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <c581439a977545d61849a72e8ed631cfc8a2a3c1
  7. Affected versionversion=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <de5dc44370fbd6b46bd7f1a1e00369be54a041c8
  8. Affected versionversion=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <ef1d739dd1f362aec081278ff92f943c31eb177a
  9. Affected versionversion=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <f2479c3daaabccbac6c343a737615d0c595c6dc4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.0; version=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <367e1e3399dbc56fc669740c4ab60e35da632b0e; version=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <51fd5ede7ed42f272682a0c33d6f0767b3484a3d; version=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <a6629659af3f5c6a91e3914ea62554c975ab77f4; version=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <c383c7c35c7bc15e07a04eefa060a8a80cbeae29; version=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <c581439a977545d61849a72e8ed631cfc8a2a3c1; version=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <de5dc44370fbd6b46bd7f1a1e00369be54a041c8; version=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <ef1d739dd1f362aec081278ff92f943c31eb177a; version=6ddbc4cf1f4d5a3a58b4223c80881f299dae3774 <f2479c3daaabccbac6c343a737615d0c595c6dc4

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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