net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send

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Summary

CVECVE-2021-47013
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-02-28 09:15:38 UTC
Updated2026-08-04 10:16:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b9b17debc69d27cd55e21ee51a5ba7fc50a426cf c7f75d11fe72913d2619f97b2334b083cd7bb955 git Not specified
CNA Linux Linux affected b9b17debc69d27cd55e21ee51a5ba7fc50a426cf dc1b438a35773d030be0ee80d9c635c3e558a322 git Not specified
CNA Linux Linux affected b9b17debc69d27cd55e21ee51a5ba7fc50a426cf 16d8c44be52e3650917736d45f5904384a9da834 git Not specified
CNA Linux Linux affected b9b17debc69d27cd55e21ee51a5ba7fc50a426cf 55fcdd1258faaecca74b91b88cc0921f9edd775d git Not specified
CNA Linux Linux affected b9b17debc69d27cd55e21ee51a5ba7fc50a426cf 9dc373f74097edd0e35f3393d6248eda8d1ba99d git Not specified
CNA Linux Linux affected b9b17debc69d27cd55e21ee51a5ba7fc50a426cf 8c06f34785068b87e2b560534c77c163d6c6dca7 git Not specified
CNA Linux Linux affected b9b17debc69d27cd55e21ee51a5ba7fc50a426cf e407495ba6788a67d1bd41714158c079e340879b git Not specified
CNA Linux Linux affected b9b17debc69d27cd55e21ee51a5ba7fc50a426cf 6d72e7c767acbbdd44ebc7d89c6690b405b32b57 git Not specified
CNA Linux Linux affected 4.9 Not specified
CNA Linux Linux unaffected 4.9 semver Not specified
CNA Linux Linux unaffected 4.9.269 4.9.* semver Not specified
CNA Linux Linux unaffected 4.14.233 4.14.* semver Not specified
CNA Linux Linux unaffected 4.19.191 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.119 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.37 5.10.* semver Not specified
CNA Linux Linux unaffected 5.11.21 5.11.* semver Not specified
CNA Linux Linux unaffected 5.12.4 5.12.* semver Not specified
CNA Linux Linux unaffected 5.13 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 755966 SUSE Enterprise Linux Security Update for the linux kernel (SUSE-SU-2024:0857-1)
  • 755988 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2024:0975-1)
  • 756004 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2024:0926-1)
  • 756005 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2024:0925-1)

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