{"api_version":"1","generated_at":"2026-06-25T04:53:08+00:00","cve":"CVE-2026-53003","urls":{"html":"https://cve.report/CVE-2026-53003","api":"https://cve.report/api/cve/CVE-2026-53003.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53003","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53003"},"summary":{"title":"pppoe: drop PFC frames","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npppoe: drop PFC frames\n\nRFC 2516 Section 7 states that Protocol Field Compression (PFC) is NOT\nRECOMMENDED for PPPoE. In practice, pppd does not support negotiating\nPFC for PPPoE sessions, and the current PPPoE driver assumes an\nuncompressed (2-byte) protocol field. However, the generic PPP layer\nfunction ppp_input() is not aware of the negotiation result, and still\naccepts PFC frames.\n\nIf a peer with a broken implementation or an attacker sends a frame with\na compressed (1-byte) protocol field, the subsequent PPP payload is\nshifted by one byte. This causes the network header to be 4-byte\nmisaligned, which may trigger unaligned access exceptions on some\narchitectures.\n\nTo reduce the attack surface, drop PPPoE PFC frames. Introduce\nppp_skb_is_compressed_proto() helper function to be used in both\nppp_generic.c and pppoe.c to avoid open-coding.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-24 17:17:11","updated_at":"2026-06-24 17:17:11"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71","name":"https://git.kernel.org/stable/c/49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8a5e840babc5c0fbd10c73728a13192347771ec6","name":"https://git.kernel.org/stable/c/8a5e840babc5c0fbd10c73728a13192347771ec6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cc1ff87bce1ccd38410ab10960f576dcd17db679","name":"https://git.kernel.org/stable/c/cc1ff87bce1ccd38410ab10960f576dcd17db679","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fcca1df05322bb04e344dd1178b54b76a08eb7c3","name":"https://git.kernel.org/stable/c/fcca1df05322bb04e344dd1178b54b76a08eb7c3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cb3beef35ab5e0c1afca9fd7648c6ae499786377","name":"https://git.kernel.org/stable/c/cb3beef35ab5e0c1afca9fd7648c6ae499786377","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2b5c3c040d020e3ab3b9a8887031202d96843b1e","name":"https://git.kernel.org/stable/c/2b5c3c040d020e3ab3b9a8887031202d96843b1e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0cab5d077dd1efd2bd1a47271acc35894f945b4f","name":"https://git.kernel.org/stable/c/0cab5d077dd1efd2bd1a47271acc35894f945b4f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ba758fdf1399f310b30098b6faa3fd043de47dd2","name":"https://git.kernel.org/stable/c/ba758fdf1399f310b30098b6faa3fd043de47dd2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53003","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53003","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 cb3beef35ab5e0c1afca9fd7648c6ae499786377 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 ba758fdf1399f310b30098b6faa3fd043de47dd2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 fcca1df05322bb04e344dd1178b54b76a08eb7c3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 8a5e840babc5c0fbd10c73728a13192347771ec6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 0cab5d077dd1efd2bd1a47271acc35894f945b4f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 2b5c3c040d020e3ab3b9a8887031202d96843b1e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 cc1ff87bce1ccd38410ab10960f576dcd17db679 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.258 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.209 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.175 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.141 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.91 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.33 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.10 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/ppp/ppp_generic.c","drivers/net/ppp/pppoe.c","include/linux/ppp_defs.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"cb3beef35ab5e0c1afca9fd7648c6ae499786377","status":"affected","version":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","versionType":"git"},{"lessThan":"ba758fdf1399f310b30098b6faa3fd043de47dd2","status":"affected","version":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","versionType":"git"},{"lessThan":"fcca1df05322bb04e344dd1178b54b76a08eb7c3","status":"affected","version":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","versionType":"git"},{"lessThan":"8a5e840babc5c0fbd10c73728a13192347771ec6","status":"affected","version":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","versionType":"git"},{"lessThan":"49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71","status":"affected","version":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","versionType":"git"},{"lessThan":"0cab5d077dd1efd2bd1a47271acc35894f945b4f","status":"affected","version":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","versionType":"git"},{"lessThan":"2b5c3c040d020e3ab3b9a8887031202d96843b1e","status":"affected","version":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","versionType":"git"},{"lessThan":"cc1ff87bce1ccd38410ab10960f576dcd17db679","status":"affected","version":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/ppp/ppp_generic.c","drivers/net/ppp/pppoe.c","include/linux/ppp_defs.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.0"},{"lessThan":"5.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.141","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.91","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.33","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.258","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.209","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.175","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.141","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.91","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\npppoe: drop PFC frames\n\nRFC 2516 Section 7 states that Protocol Field Compression (PFC) is NOT\nRECOMMENDED for PPPoE. In practice, pppd does not support negotiating\nPFC for PPPoE sessions, and the current PPPoE driver assumes an\nuncompressed (2-byte) protocol field. However, the generic PPP layer\nfunction ppp_input() is not aware of the negotiation result, and still\naccepts PFC frames.\n\nIf a peer with a broken implementation or an attacker sends a frame with\na compressed (1-byte) protocol field, the subsequent PPP payload is\nshifted by one byte. This causes the network header to be 4-byte\nmisaligned, which may trigger unaligned access exceptions on some\narchitectures.\n\nTo reduce the attack surface, drop PPPoE PFC frames. Introduce\nppp_skb_is_compressed_proto() helper function to be used in both\nppp_generic.c and pppoe.c to avoid open-coding."}],"providerMetadata":{"dateUpdated":"2026-06-24T16:29:15.268Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/cb3beef35ab5e0c1afca9fd7648c6ae499786377"},{"url":"https://git.kernel.org/stable/c/ba758fdf1399f310b30098b6faa3fd043de47dd2"},{"url":"https://git.kernel.org/stable/c/fcca1df05322bb04e344dd1178b54b76a08eb7c3"},{"url":"https://git.kernel.org/stable/c/8a5e840babc5c0fbd10c73728a13192347771ec6"},{"url":"https://git.kernel.org/stable/c/49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71"},{"url":"https://git.kernel.org/stable/c/0cab5d077dd1efd2bd1a47271acc35894f945b4f"},{"url":"https://git.kernel.org/stable/c/2b5c3c040d020e3ab3b9a8887031202d96843b1e"},{"url":"https://git.kernel.org/stable/c/cc1ff87bce1ccd38410ab10960f576dcd17db679"}],"title":"pppoe: drop PFC frames","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53003","datePublished":"2026-06-24T16:29:15.268Z","dateReserved":"2026-06-09T07:44:35.377Z","dateUpdated":"2026-06-24T16:29:15.268Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-24 17:17:11","lastModifiedDate":"2026-06-24 17:17:11","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53003","Ordinal":"1","Title":"pppoe: drop PFC frames","CVE":"CVE-2026-53003","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53003","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\npppoe: drop PFC frames\n\nRFC 2516 Section 7 states that Protocol Field Compression (PFC) is NOT\nRECOMMENDED for PPPoE. In practice, pppd does not support negotiating\nPFC for PPPoE sessions, and the current PPPoE driver assumes an\nuncompressed (2-byte) protocol field. However, the generic PPP layer\nfunction ppp_input() is not aware of the negotiation result, and still\naccepts PFC frames.\n\nIf a peer with a broken implementation or an attacker sends a frame with\na compressed (1-byte) protocol field, the subsequent PPP payload is\nshifted by one byte. This causes the network header to be 4-byte\nmisaligned, which may trigger unaligned access exceptions on some\narchitectures.\n\nTo reduce the attack surface, drop PPPoE PFC frames. Introduce\nppp_skb_is_compressed_proto() helper function to be used in both\nppp_generic.c and pppoe.c to avoid open-coding.","Type":"Description","Title":"pppoe: drop PFC frames"}]}}}