CVE-2026-98287

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98287", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.336Z", "datePublished": "2026-10-06T08:45:47.998Z", "dateUpdated": "2026-10-19T09:16:58.585Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:16:58.585Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npppoatm: ensure a writable skb header and linear data\n\nIn pppoatm_send(), LLC encapsulation checks whether there is sufficient\nheadroom for the 4-byte LLC header, but does not ensure that the skb header\nis writable.\n\nNormal transmit packets passing through ppp_start_xmit() have their header\nunshared via skb_cow_head(). However, packets can also reach pppoatm_send()\nvia PPP channel bridging (PPPIOCBRIDGECHAN) without going through\nppp_start_xmit().\n\nUse skb_cow_head() to ensure both sufficient headroom and a writable\nheader before pushing the LLC header.\n\nWhile at it:\n- Call pskb_may_pull(skb, 1) before inspecting skb->data[0] to prevent\n out-of-bounds reads on zero-length or non-linear frames (e.g. from\n bridging).\n- Defer SC_COMP_PROT protocol compression until after pppoatm_may_send()\n succeeds. This eliminates the temporary skb allocation on admission failure\n and completely removes the fragile \"undo\" heuristic at the nospace label,\n avoiding any risk of reading uninitialized headroom or performing an\n unbalanced skb_push()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/atm/pppoatm.c"], "versions": [{"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "208ccc4d08b1897451e9ba01c016bf93ff107966", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "e6cd1bba7d113c15c00ac63671213a096fe4d686", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "ffc448eb54f5ba80d4212c1e870cdb92b0f709fa", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "8e66c5969acd859ba72fb0a7fa895623fc1b3769", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "e2f5529b0016db7d34f411408607f5cf395a542e", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "30992fe39e65589ed8e000425e088fa74994b811", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "ecc7253683a3c55caa868ce0ee530fcb0044bd3c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/atm/pppoatm.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.8", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.12.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.18.54"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.2.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/208ccc4d08b1897451e9ba01c016bf93ff107966"}, {"url": "https://git.kernel.org/stable/c/e6cd1bba7d113c15c00ac63671213a096fe4d686"}, {"url": "https://git.kernel.org/stable/c/ffc448eb54f5ba80d4212c1e870cdb92b0f709fa"}, {"url": "https://git.kernel.org/stable/c/8e66c5969acd859ba72fb0a7fa895623fc1b3769"}, {"url": "https://git.kernel.org/stable/c/e2f5529b0016db7d34f411408607f5cf395a542e"}, {"url": "https://git.kernel.org/stable/c/30992fe39e65589ed8e000425e088fa74994b811"}, {"url": "https://git.kernel.org/stable/c/ecc7253683a3c55caa868ce0ee530fcb0044bd3c"}], "title": "pppoatm: ensure a writable skb header and linear data", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/atm/pppoatm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "208ccc4d08b1897451e9ba01c016bf93ff107966", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}, {"lessThan": "e6cd1bba7d113c15c00ac63671213a096fe4d686", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}, {"lessThan": "ffc448eb54f5ba80d4212c1e870cdb92b0f709fa", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}, {"lessThan": "8e66c5969acd859ba72fb0a7fa895623fc1b3769", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}, {"lessThan": "e2f5529b0016db7d34f411408607f5cf395a542e", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}, {"lessThan": "30992fe39e65589ed8e000425e088fa74994b811", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}, {"lessThan": "ecc7253683a3c55caa868ce0ee530fcb0044bd3c", "status": "affected", "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/atm/pppoatm.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": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.54", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\npppoatm: ensure a writable skb header and linear data\n\nIn pppoatm_send(), LLC encapsulation checks whether there is sufficient\nheadroom for the 4-byte LLC header, but does not ensure that the skb header\nis writable.\n\nNormal transmit packets passing through ppp_start_xmit() have their header\nunshared via skb_cow_head(). However, packets can also reach pppoatm_send()\nvia PPP channel bridging (PPPIOCBRIDGECHAN) without going through\nppp_start_xmit().\n\nUse skb_cow_head() to ensure both sufficient headroom and a writable\nheader before pushing the LLC header.\n\nWhile at it:\n- Call pskb_may_pull(skb, 1) before inspecting skb->data[0] to prevent\n out-of-bounds reads on zero-length or non-linear frames (e.g. from\n bridging).\n- Defer SC_COMP_PROT protocol compression until after pppoatm_may_send()\n succeeds. This eliminates the temporary skb allocation on admission failure\n and completely removes the fragile \"undo\" heuristic at the nospace label,\n avoiding any risk of reading uninitialized headroom or performing an\n unbalanced skb_push()."}], "id": "CVE-2026-98287", "lastModified": "2026-10-19T10:18:30.283", "metrics": {}, "published": "2026-10-06T09:18:18.880", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/208ccc4d08b1897451e9ba01c016bf93ff107966"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/30992fe39e65589ed8e000425e088fa74994b811"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8e66c5969acd859ba72fb0a7fa895623fc1b3769"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e2f5529b0016db7d34f411408607f5cf395a542e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e6cd1bba7d113c15c00ac63671213a096fe4d686"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ecc7253683a3c55caa868ce0ee530fcb0044bd3c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ffc448eb54f5ba80d4212c1e870cdb92b0f709fa"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: pppoatm: ensure a writable skb header and linear data", "id": "2546536", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2546536"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\npppoatm: ensure a writable skb header and linear data\nIn pppoatm_send(), LLC encapsulation checks whether there is sufficient\nheadroom for the 4-byte LLC header, but does not ensure that the skb header\nis writable.\nNormal transmit packets passing through ppp_start_xmit() have their header\nunshared via skb_cow_head(). However, packets can also reach pppoatm_send()\nvia PPP channel bridging (PPPIOCBRIDGECHAN) without going through\nppp_start_xmit().\nUse skb_cow_head() to ensure both sufficient headroom and a writable\nheader before pushing the LLC header.\nWhile at it:\n- Call pskb_may_pull(skb, 1) before inspecting skb->data[0] to prevent\nout-of-bounds reads on zero-length or non-linear frames (e.g. from\nbridging).\n- Defer SC_COMP_PROT protocol compression until after pppoatm_may_send()\nsucceeds. This eliminates the temporary skb allocation on admission failure\nand completely removes the fragile \"undo\" heuristic at the nospace label,\navoiding any risk of reading uninitialized headroom or performing an\nunbalanced skb_push().", "A flaw was found in the Linux kernel's Point-to-Point Protocol over ATM (PPPoATM) subsystem. This vulnerability allows a local attacker to cause a Denial of Service (DoS) or memory corruption by transmitting network packets across bridged Point-to-Point Protocol (PPP) channels. The issue occurs because the driver fails to ensure that packet buffer headers are writable before encapsulation, which can lead to an unexpected system crash."], "name": "CVE-2026-98287", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "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": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98287\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98287\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98287.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,208ccc4d08b1897451e9ba01c016bf93ff107966)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,e6cd1bba7d113c15c00ac63671213a096fe4d686)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,ffc448eb54f5ba80d4212c1e870cdb92b0f709fa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,8e66c5969acd859ba72fb0a7fa895623fc1b3769)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,e2f5529b0016db7d34f411408607f5cf395a542e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,30992fe39e65589ed8e000425e088fa74994b811)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4cf476ced45d7f12df30a68e833b263e7a2202d1,ecc7253683a3c55caa868ce0ee530fcb0044bd3c)"}}], "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": "semver", "value": "5.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.222,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.189,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.158,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.112,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.54,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.8,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc4,*]"}}], "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": "2026-10-06T14:15:17.995727+00:00", "updated": "2026-10-09T14:15:09.437688+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-119", "CWE-125"]}