esp: fix skb leak with espintcp and async crypto

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Summary

CVECVE-2026-31518
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:51 UTC
Updated2026-07-14 13:18:44 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: esp: fix skb leak with espintcp and async crypto When the TX queue for espintcp is full, esp_output_tail_tcp will return an error and not free the skb, because with synchronous crypto, the common xfrm output code will drop the packet for us. With async crypto (esp_output_done), we need to drop the skb when esp_output_tail_tcp returns an error.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000240000 probability, percentile 0.067930000 (date 2026-04-26)

Problem Types: CWE-401

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 aca3ad0c262f54a5b5c95dda80a48365997d1224 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 41aafca57de4a4c026701622bd4648f112a9edcd git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 4820847e036ff1035b01b69ad68dfc17e7028fe9 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 6a3ec6efbc4f90e0ccb2e71574f07351f19996f4 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 df6f995358dc1f3c42484f5cfe241d7bd3e1cd15 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 88d386243ed374ac969dabd3bbc1409a31d81818 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 6aa9841d917532d0f2d932d1ff2f3a94305aaf47 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2 git Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.131 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4820847e036ff1035b01b69ad68dfc17e7028fe9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/aca3ad0c262f54a5b5c95dda80a48365997d1224 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-082556.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/6a3ec6efbc4f90e0ccb2e71574f07351f19996f4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/88d386243ed374ac969dabd3bbc1409a31d81818 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/df6f995358dc1f3c42484f5cfe241d7bd3e1cd15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6aa9841d917532d0f2d932d1ff2f3a94305aaf47 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/41aafca57de4a4c026701622bd4648f112a9edcd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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