xfrm: espintcp: fix UAF during close
In the Linux kernel, the following vulnerability has been resolved: xfrm: espintcp: fix UAF during close ZDI reported and analyzed a race condition during close for espintcp sockets: espintcp_close() frees emsg->skb via kfree_skb() without holding any socket lock. Concurrently, the xfrm_trans_reinject work queue invokes esp_output_tcp_finish() -> espintcp_push_skb() -> espintcp_push_msgs() -> skb_send_sock_locked(), which reads the same skb as a data source. Fix this by adding a synchronize_rcu() call after resetting sk_prot, since esp_output_tcp_finish() runs under RCU and won't use a socket with sk_prot == &tcp_prot. Simply taking the socket lock in espintcp_close() could lead to leaks, if esp_output_tcp_finish() re-adds an skb in the slot we just freed. After this, the existing barrier() is no longer needed.
CVE-2026-80848
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-2026-80848
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": "29121c5e6591da527e8e36ddac7120dc527f574d",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "ed5d9102190c45fc70121c036b0626b740040b75",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "4bc0dfa28dca6fc0084203732695968049c44072",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "ff8dd7a932f34409a56e1b91a1219340f17457e9",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "4b31a875693c480c611519faca46216514e3e052",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "24efebecf415ba264adba0f0491cec436463a14f",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "eb3bbf29c723fe75c0eb92be14f0ec92971fe272",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "54b41ad14da9a981131ab6e4d3f79321a503ea5d",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "deb232e884877bf10b4ce2580909eedec986c284",
"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": "5.10.269",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.220",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.187",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.156",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.108",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.49",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.13",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.3",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xfrm/espintcp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80848
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34863 · Revision 1
- Added to Heist Feed
- Publisher date