xfrm: espintcp: do not reuse an in-progress partial send
In 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.
CVE-2026-52935
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-52935
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "6564e9c7af7e1dc7bfe7f3093b728abe484d7630",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "1777ceac4bea5e568a5ad44b7f9bb219c1db21b6",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "aa82a078f70f7ff88ba7d1017134e79d1ac140f2",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "ba21439302db9a82fe4edbed1e38a97271529421",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "37487d55bf3300e3d2c1368da5c2bd3e3834ea4f",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "c381039ade2e161ab08c0eda73c4f8b9a7115928",
"versionType": "git"
}
],
"programFiles": [
"net/xfrm/espintcp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xfrm/espintcp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-52935
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40701 · Revision 1
- Added to Heist Feed
- Publisher date