{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53003", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.377Z", "datePublished": "2026-06-24T16:29:15.268Z", "dateUpdated": "2026-06-24T16:29:15.268Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-24T16:29:15.268Z"}, "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."}], "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", "drivers/net/ppp/pppoe.c", "include/linux/ppp_defs.h"], "versions": [{"version": "7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6", "lessThan": "cb3beef35ab5e0c1afca9fd7648c6ae499786377", "status": "affected", "versionType": "git"}, {"version": "7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6", "lessThan": "ba758fdf1399f310b30098b6faa3fd043de47dd2", "status": "affected", "versionType": "git"}, {"version": "7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6", "lessThan": "fcca1df05322bb04e344dd1178b54b76a08eb7c3", "status": "affected", "versionType": "git"}, {"version": "7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6", "lessThan": "8a5e840babc5c0fbd10c73728a13192347771ec6", "status": "affected", "versionType": "git"}, {"version": "7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6", "lessThan": "49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71", "status": "affected", "versionType": "git"}, {"version": "7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6", "lessThan": "0cab5d077dd1efd2bd1a47271acc35894f945b4f", "status": "affected", "versionType": "git"}, {"version": "7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6", "lessThan": "2b5c3c040d020e3ab3b9a8887031202d96843b1e", "status": "affected", "versionType": "git"}, {"version": "7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6", "lessThan": "cc1ff87bce1ccd38410ab10960f576dcd17db679", "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", "drivers/net/ppp/pppoe.c", "include/linux/ppp_defs.h"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.0", "versionEndExcluding": "5.10.258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.141"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.91"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.1"}]}]}], "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"}}}}

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