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mptcp: make fallback action and fallback decision atomic

Type: advisorySource: Official CVE List1 source record

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:

Announced Source revision 1
Original source ↗

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
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