{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97964", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:18:58.206Z", "datePublished": "2026-09-25T10:23:07.350Z", "dateUpdated": "2026-09-25T10:23:07.350Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-25T10:23:07.350Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp_synctty: ensure a writeable skb header\n\nppp_sync_txmunge() checks headroom before prepending the address and\ncontrol bytes, but does not ensure that the skb header is writable.\nA received skb can reach this function through PPP channel bridging\nwithout passing through ppp_start_xmit(), which calls skb_cow_head().\n\nFor example, a PPPoE frame may share its buffer with a clone queued to\nan AF_PACKET socket. If it is bridged to a synchronous tty channel, the\naddress/control bytes can overwrite data still visible to that socket.\n\nUse skb_cow_head() to ensure both sufficient headroom and a writable\nheader."}], "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_synctty.c"], "versions": [{"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "3af7797fbabc84992e0ca5ad2bc0ca8537d053ef", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "15d0a6c9a42df2d745c37510dba828f6dbe60d9f", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "8aaeb56aff2a557a88f83ae866da2c91ad247e59", "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_synctty.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-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": "5.11", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.3-rc3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3af7797fbabc84992e0ca5ad2bc0ca8537d053ef"}, {"url": "https://git.kernel.org/stable/c/0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e"}, {"url": "https://git.kernel.org/stable/c/15d0a6c9a42df2d745c37510dba828f6dbe60d9f"}, {"url": "https://git.kernel.org/stable/c/8aaeb56aff2a557a88f83ae866da2c91ad247e59"}], "title": "ppp_synctty: ensure a writeable skb header", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ppp/ppp_synctty.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3af7797fbabc84992e0ca5ad2bc0ca8537d053ef", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}, {"lessThan": "0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}, {"lessThan": "15d0a6c9a42df2d745c37510dba828f6dbe60d9f", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}, {"lessThan": "8aaeb56aff2a557a88f83ae866da2c91ad247e59", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ppp/ppp_synctty.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"lessThan": "5.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp_synctty: ensure a writeable skb header\n\nppp_sync_txmunge() checks headroom before prepending the address and\ncontrol bytes, but does not ensure that the skb header is writable.\nA received skb can reach this function through PPP channel bridging\nwithout passing through ppp_start_xmit(), which calls skb_cow_head().\n\nFor example, a PPPoE frame may share its buffer with a clone queued to\nan AF_PACKET socket. If it is bridged to a synchronous tty channel, the\naddress/control bytes can overwrite data still visible to that socket.\n\nUse skb_cow_head() to ensure both sufficient headroom and a writable\nheader."}], "id": "CVE-2026-97964", "lastModified": "2026-09-25T11:17:24.187", "metrics": {}, "published": "2026-09-25T11:17:24.187", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/15d0a6c9a42df2d745c37510dba828f6dbe60d9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3af7797fbabc84992e0ca5ad2bc0ca8537d053ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8aaeb56aff2a557a88f83ae866da2c91ad247e59"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ppp_synctty: ensure a writeable skb header", "id": "2541113", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541113"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nppp_synctty: ensure a writeable skb header\nppp_sync_txmunge() checks headroom before prepending the address and\ncontrol bytes, but does not ensure that the skb header is writable.\nA received skb can reach this function through PPP channel bridging\nwithout passing through ppp_start_xmit(), which calls skb_cow_head().\nFor example, a PPPoE frame may share its buffer with a clone queued to\nan AF_PACKET socket. If it is bridged to a synchronous tty channel, the\naddress/control bytes can overwrite data still visible to that socket.\nUse skb_cow_head() to ensure both sufficient headroom and a writable\nheader.", "A flaw was found in the Linux kernel's Point-to-Point Protocol (PPP) synchronous tty driver. When network packets are forwarded through PPP channel bridging, the driver prepends protocol header bytes to shared packet buffers without ensuring they are exclusively writable. This issue allows network traffic or a local user to overwrite data in shared network buffers, leading to data corruption or a Denial of Service (DoS)."], "name": "CVE-2026-97964", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97964\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97964\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97964.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,3af7797fbabc84992e0ca5ad2bc0ca8537d053ef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,15d0a6c9a42df2d745c37510dba828f6dbe60d9f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,8aaeb56aff2a557a88f83ae866da2c91ad247e59)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T14:45:18.438939+00:00", "updated": "2026-09-25T22:45:14.791795+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-119"]}