{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-39673", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.112Z", "datePublished": "2025-09-05T17:20:38.769Z", "dateUpdated": "2025-09-05T17:20:38.769Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-09-05T17:20:38.769Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp: fix race conditions in ppp_fill_forward_path\n\nppp_fill_forward_path() has two race conditions:\n\n1. The ppp->channels list can change between list_empty() and\n list_first_entry(), as ppp_lock() is not held. If the only channel\n is deleted in ppp_disconnect_channel(), list_first_entry() may\n access an empty head or a freed entry, and trigger a panic.\n\n2. pch->chan can be NULL. When ppp_unregister_channel() is called,\n pch->chan is set to NULL before pch is removed from ppp->channels.\n\nFix these by using a lockless RCU approach:\n- Use list_first_or_null_rcu() to safely test and access the first list\n entry.\n- Convert list modifications on ppp->channels to their RCU variants and\n add synchronize_net() after removal.\n- Check for a NULL pch->chan before dereferencing it."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ppp/ppp_generic.c"], "versions": [{"version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7", "status": "affected", "versionType": "git"}, {"version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "0f1630be6fcca3f0c63e4b242ad202e5cde28a40", "status": "affected", "versionType": "git"}, {"version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "ca18d751bcc9faf5b7e82e9fae1223d103928181", "status": "affected", "versionType": "git"}, {"version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "94731cc551e29511d85aa8dec61a6c071b1f2430", "status": "affected", "versionType": "git"}, {"version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "f97f6475fdcb3c28ff3c55cc4b7bde632119ec08", "status": "affected", "versionType": "git"}, {"version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "0417adf367a0af11adf7ace849af4638cfb573f7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ppp/ppp_generic.c"], "versions": [{"version": "5.13", "status": "affected"}, {"version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.190", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.149", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.103", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.44", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.4", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17-rc3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "5.15.190"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.1.149"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.6.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.12.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.16.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.17-rc3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7"}, {"url": "https://git.kernel.org/stable/c/0f1630be6fcca3f0c63e4b242ad202e5cde28a40"}, {"url": "https://git.kernel.org/stable/c/ca18d751bcc9faf5b7e82e9fae1223d103928181"}, {"url": "https://git.kernel.org/stable/c/94731cc551e29511d85aa8dec61a6c071b1f2430"}, {"url": "https://git.kernel.org/stable/c/f97f6475fdcb3c28ff3c55cc4b7bde632119ec08"}, {"url": "https://git.kernel.org/stable/c/0417adf367a0af11adf7ace849af4638cfb573f7"}], "title": "ppp: fix race conditions in ppp_fill_forward_path", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp: fix race conditions in ppp_fill_forward_path\n\nppp_fill_forward_path() has two race conditions:\n\n1. The ppp->channels list can change between list_empty() and\n list_first_entry(), as ppp_lock() is not held. If the only channel\n is deleted in ppp_disconnect_channel(), list_first_entry() may\n access an empty head or a freed entry, and trigger a panic.\n\n2. pch->chan can be NULL. When ppp_unregister_channel() is called,\n pch->chan is set to NULL before pch is removed from ppp->channels.\n\nFix these by using a lockless RCU approach:\n- Use list_first_or_null_rcu() to safely test and access the first list\n entry.\n- Convert list modifications on ppp->channels to their RCU variants and\n add synchronize_net() after removal.\n- Check for a NULL pch->chan before dereferencing it."}], "id": "CVE-2025-39673", "lastModified": "2025-09-05T18:15:43.230", "metrics": {}, "published": "2025-09-05T18:15:43.230", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0417adf367a0af11adf7ace849af4638cfb573f7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0f1630be6fcca3f0c63e4b242ad202e5cde28a40"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/94731cc551e29511d85aa8dec61a6c071b1f2430"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ca18d751bcc9faf5b7e82e9fae1223d103928181"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f97f6475fdcb3c28ff3c55cc4b7bde632119ec08"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{}