mptcp: fix NULL pointer in can_accept_new_subflow
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix NULL pointer in can_accept_new_subflow When testing valkey benchmark tool with MPTCP, the kernel panics in 'mptcp_can_accept_new_subflow' because subflow_req->msk is NULL. Call trace: mptcp_can_accept_new_subflow (./net/mptcp/subflow.c:63 (discriminator 4)) (P) subflow_syn_recv_sock (./net/mptcp/subflow.c:854) tcp_check_req (./net/ipv4/tcp_minisocks.c:863) tcp_v4_rcv (./net/ipv4/tcp_ipv4.c:2268) ip_protocol_deliver_rcu (./net/ipv4/ip_input.c:207) ip_local_deliver_finish (./net/ipv4/ip_input.c:234) ip_local_deliver (./net/ipv4/ip_input.c:254) ip_rcv_finish (./net/ipv4/ip_input.c:449) ... According to the debug log, the same req received two SYN-ACK in a very short time, very likely because the client retransmits the syn ack due to multiple reasons. Even if the packets are transmitted with a relevant time interval, they can be processed by the server on different CPUs concurrently). The 'subflow_req->msk' ownership is transferred to the subflow the first, and there will be a risk of a null pointer dereference here. This patch fixes this issue by moving the 'subflow_req->msk' under the `own_req == true` conditional. Note that the !msk check in subflow_hmac_valid() can be dropped, because the same check already exists under the own_req mpj branch where the code has been moved to.
CVE-2025-23145
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-2025-23145
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": "9466a1ccebbe54ac57fb8a89c2b4b854826546a8",
"lessThan": "8cf7fef1bb2ffea7792bcbf71ca00216cecc725d",
"versionType": "git"
},
{
"status": "affected",
"version": "9466a1ccebbe54ac57fb8a89c2b4b854826546a8",
"lessThan": "b3088bd2a6790c8efff139d86d7a9d0b1305977b",
"versionType": "git"
},
{
"status": "affected",
"version": "9466a1ccebbe54ac57fb8a89c2b4b854826546a8",
"lessThan": "855bf0aacd51fced11ea9aa0d5101ee0febaeadb",
"versionType": "git"
},
{
"status": "affected",
"version": "9466a1ccebbe54ac57fb8a89c2b4b854826546a8",
"lessThan": "7f9ae060ed64aef8f174c5f1ea513825b1be9af1",
"versionType": "git"
},
{
"status": "affected",
"version": "9466a1ccebbe54ac57fb8a89c2b4b854826546a8",
"lessThan": "dc81e41a307df523072186b241fa8244fecd7803",
"versionType": "git"
},
{
"status": "affected",
"version": "9466a1ccebbe54ac57fb8a89c2b4b854826546a8",
"lessThan": "efd58a8dd9e7a709a90ee486a4247c923d27296f",
"versionType": "git"
},
{
"status": "affected",
"version": "9466a1ccebbe54ac57fb8a89c2b4b854826546a8",
"lessThan": "4b2649b9717678aeb097893cc49f59311a1ecab0",
"versionType": "git"
},
{
"status": "affected",
"version": "9466a1ccebbe54ac57fb8a89c2b4b854826546a8",
"lessThan": "443041deb5ef6a1289a99ed95015ec7442f141dc",
"versionType": "git"
}
],
"programFiles": [
"net/mptcp/subflow.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.237",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.181",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.135",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.88",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.24",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.12",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14.3",
"versionType": "semver",
"lessThanOrEqual": "6.14.*"
},
{
"status": "unaffected",
"version": "6.15",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/mptcp/subflow.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-23145
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30467 · Revision 1
- Added to Heist Feed
- Publisher date