mptcp: make fallback action and fallback decision atomic
In the Linux kernel, the following vulnerability has been resolved: mptcp: make fallback action and fallback decision atomic Syzkaller reported the following splat: WARNING: CPU: 1 PID: 7704 at net/mptcp/protocol.h:1223 __mptcp_do_fallback net/mptcp/protocol.h:1223 [inline] WARNING: CPU: 1 PID: 7704 at net/mptcp/protocol.h:1223 mptcp_do_fallback net/mptcp/protocol.h:1244 [inline] WARNING: CPU: 1 PID: 7704 at net/mptcp/protocol.h:1223 check_fully_established net/mptcp/options.c:982 [inline] WARNING: CPU: 1 PID: 7704 at net/mptcp/protocol.h:1223 mptcp_incoming_options+0x21a8/0x2510 net/mptcp/options.c:1153 Modules linked in: CPU: 1 UID: 0 PID: 7704 Comm: syz.3.1419 Not tainted 6.16.0-rc3-gbd5ce2324dba #20 PREEMPT(voluntary) Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__mptcp_do_fallback net/mptcp/protocol.h:1223 [inline] RIP: 0010:mptcp_do_fallback net/mptcp/protocol.h:1244 [inline] RIP: 0010:check_fully_established net/mptcp/options.c:982 [inline] RIP: 0010:mptcp_incoming_options+0x21a8/0x2510 net/mptcp/options.c:1153 Code: 24 18 e8 bb 2a 00 fd e9 1b df ff ff e8 b1 21 0f 00 e8 ec 5f c4 fc 44 0f b7 ac 24 b0 00 00 00 e9 54 f1 ff ff e8 d9 5f c4 fc 90 <0f> 0b 90 e9 b8 f4 ff ff e8 8b 2a 00 fd e9 8d e6 ff ff e8 81 2a 00 RSP: 0018:ffff8880a3f08448 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880180a8000 RCX: ffffffff84afcf45 RDX: ffff888090223700 RSI: ffffffff84afdaa7 RDI: 0000000000000001 RBP: ffff888017955780 R08:
CVE-2025-38491
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-2025-38491
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": "0530020a7c8f2204e784f0dbdc882bbd961fdbde",
"lessThan": "5586518bec27666c747cd52aabb62d485686d0bf",
"versionType": "git"
},
{
"status": "affected",
"version": "0530020a7c8f2204e784f0dbdc882bbd961fdbde",
"lessThan": "75a4c9ab8a7af0d76b31ccd1188ed178c38b35d2",
"versionType": "git"
},
{
"status": "affected",
"version": "0530020a7c8f2204e784f0dbdc882bbd961fdbde",
"lessThan": "54999dea879fecb761225e28f274b40662918c30",
"versionType": "git"
},
{
"status": "affected",
"version": "0530020a7c8f2204e784f0dbdc882bbd961fdbde",
"lessThan": "1d82a8fe6ee4afdc92f4e8808c9dad2a6095bbc5",
"versionType": "git"
},
{
"status": "affected",
"version": "0530020a7c8f2204e784f0dbdc882bbd961fdbde",
"lessThan": "f8a1d9b18c5efc76784f5a326e905f641f839894",
"versionType": "git"
},
{
"status": "affected",
"version": "609937aa962a62e93acfc04dd370b665e6152dfb",
"versionType": "git"
},
{
"status": "affected",
"version": "6654efe264b014d8ea9fc38f79efb568b1b79069",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.228",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.169",
"lessThan": "5.16",
"versionType": "semver"
}
],
"programFiles": [
"net/mptcp/options.c",
"net/mptcp/protocol.c",
"net/mptcp/protocol.h",
"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": "5.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.149",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.101",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.40",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.8",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/mptcp/options.c",
"net/mptcp/protocol.c",
"net/mptcp/protocol.h",
"net/mptcp/subflow.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38491
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30579 · Revision 1
- Added to Heist Feed
- Publisher date