xfrm: espintcp: do not reuse an in-progress partial send

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Summary

CVECVE-2026-52935
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 08:16:23 UTC
Updated2026-07-08 20:35:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfrm: espintcp: do not reuse an in-progress partial send espintcp keeps a single in-flight transmit in ctx->partial. Before building a new sk_msg, espintcp_sendmsg() first tries to flush that state through espintcp_push_msgs(). For blocking callers, espintcp_push_msgs() may return success even when the previous partial send is still pending. espintcp_sendmsg() would then reinitialize emsg->skmsg and reuse ctx->partial while the old transfer still owns that state. Do not rebuild the send message when ctx->partial is still in progress. If espintcp_push_msgs() returns with emsg->len still set, fail the new send instead of overwriting the live partial state. This is a memory-safety fix: reusing the live partial-send state can leave a stale offset attached to a new sk_msg and lead to an out-of- bounds read in the send path. tcp_sendmsg_locked() already handles waiting for send buffer memory, so the fix here is just to preserve espintcp's one-message-at-a-time transmit state.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001200000 probability, percentile 0.021840000 (date 2026-07-09)

Problem Types: CWE-787

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/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 e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 6564e9c7af7e1dc7bfe7f3093b728abe484d7630 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 1777ceac4bea5e568a5ad44b7f9bb219c1db21b6 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 aa82a078f70f7ff88ba7d1017134e79d1ac140f2 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 ba21439302db9a82fe4edbed1e38a97271529421 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990 git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 37487d55bf3300e3d2c1368da5c2bd3e3834ea4f git Not specified
CNA Linux Linux affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 c381039ade2e161ab08c0eda73c4f8b9a7115928 git Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6564e9c7af7e1dc7bfe7f3093b728abe484d7630 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c381039ade2e161ab08c0eda73c4f8b9a7115928 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1777ceac4bea5e568a5ad44b7f9bb219c1db21b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/aa82a078f70f7ff88ba7d1017134e79d1ac140f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ba21439302db9a82fe4edbed1e38a97271529421 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/37487d55bf3300e3d2c1368da5c2bd3e3834ea4f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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