CVE-2026-45843

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Neither helper\nbounds-checks against isize, and decode() masks its return with\n& 0xffff so it can never return the -1 that callers test for -- those\nerror paths are dead code.\n\nA short compressed frame whose change byte requests optional fields\nlets decode() read past the end of the packet. The over-read bytes\nare folded into the cached cstate and reflected into subsequent\nreconstructed packets.\n\nMake decode() and pull16() take the packet end pointer and return -1\nwhen exhausted. Add a bounds check before the TCP-checksum read.\nThe existing == -1 tests now do what they were always meant to."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "baseScore": 8.2, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - slhc_uncompress() processes VJ-compressed headers received from the remote PPP/SLIP link peer; via PPP-over-PPTP/L2TP tunnels that peer is an internet-reachable attacker sending crafted frames.\nAC:L - A short compressed frame with a change byte requesting optional fields reliably triggers the over-read; no race, timing, or memory-layout condition outside the attacker's control.\nPR:N - The attacker is a remote link peer (e.g., malicious VPN/dial-up server, or a client of the target's PPTP/L2TP server) with no account or privilege on the target host.\nUI:N - Once a VJ-enabled PPP link exists, the malicious frame is processed automatically; in the attacker-initiated server scenario no victim action is needed at exploit time.\nS:U - The over-read and its effects stay within the kernel's own decompression buffers and state; no crossing into another security authority.\nC:H - Out-of-bounds read of adjacent memory \u2014 including uninitialized kernel slab memory in the PPP fresh-skb path \u2014 folded into reconstructed TCP/IP header fields delivered to the IP stack, disclosing kernel memory.\nI:L - The over-read pollutes the cached decompression state (cs_tcp/cs_ip) and corrupts header fields of subsequently reconstructed packets with stale data, but yields no arbitrary or out-of-bounds write primitive.\nA:N - Guaranteed buffer slack plus the len<0 rejection keep all reads within the allocation and prevent any out-of-bounds write, so there is no crash, hang, or panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": 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"https://git.kernel.org/stable/c/335957df4ed60f02a2ec0432fbedbf0cc7241d8b"}, {"url": "https://git.kernel.org/stable/c/37537e42e6df387398bee85cb85070cc80bb1e10"}, {"url": "https://git.kernel.org/stable/c/4cefe32639933d652614b0bd50f818f9af4af78f"}, {"url": "https://git.kernel.org/stable/c/0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d"}, {"url": "https://git.kernel.org/stable/c/d42bec6e4f6d6d658be365539400b3314b76b2a7"}, {"url": "https://git.kernel.org/stable/c/4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7"}], "title": "slip: bound decode() reads against the compressed packet length", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:19:46.866Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], 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slhc_uncompress() processes VJ-compressed headers received from the remote PPP/SLIP link peer; via PPP-over-PPTP/L2TP tunnels that peer is an internet-reachable attacker sending crafted frames.\nAC:L - A short compressed frame with a change byte requesting optional fields reliably triggers the over-read; no race, timing, or memory-layout condition outside the attacker's control.\nPR:N - The attacker is a remote link peer (e.g., malicious VPN/dial-up server, or a client of the target's PPTP/L2TP server) with no account or privilege on the target host.\nUI:N - Once a VJ-enabled PPP link exists, the malicious frame is processed automatically; in the attacker-initiated server scenario no victim action is needed at exploit time.\nS:U - The over-read and its effects stay within the kernel's own decompression buffers and state; no crossing into another security authority.\nC:H - Out-of-bounds read of adjacent memory \u2014 including uninitialized kernel slab memory in the PPP fresh-skb path \u2014 folded into reconstructed TCP/IP header fields delivered to the IP stack, disclosing kernel memory.\nI:L - The over-read pollutes the cached decompression state (cs_tcp/cs_ip) and corrupts header fields of subsequently reconstructed packets with stale data, but yields no arbitrary or out-of-bounds write primitive.\nA:N - Guaranteed buffer slack plus the len<0 rejection keep all reads within the allocation and prevent any out-of-bounds write, so there is no crash, hang, or panic."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6268f01ae989013671b526c883e92655342c6f6f", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9aafba2f49e1fcccc2018816f5836a609c925879", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "335957df4ed60f02a2ec0432fbedbf0cc7241d8b", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "37537e42e6df387398bee85cb85070cc80bb1e10", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "4cefe32639933d652614b0bd50f818f9af4af78f", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d42bec6e4f6d6d658be365539400b3314b76b2a7", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7", "versionType": "git"}], "programFiles": ["drivers/net/slip/slhc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.141", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.91", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.33", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.10", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/slip/slhc.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/6268f01ae989013671b526c883e92655342c6f6f"}, {"url": "https://git.kernel.org/stable/c/9aafba2f49e1fcccc2018816f5836a609c925879"}, {"url": "https://git.kernel.org/stable/c/335957df4ed60f02a2ec0432fbedbf0cc7241d8b"}, {"url": "https://git.kernel.org/stable/c/37537e42e6df387398bee85cb85070cc80bb1e10"}, {"url": "https://git.kernel.org/stable/c/4cefe32639933d652614b0bd50f818f9af4af78f"}, {"url": "https://git.kernel.org/stable/c/0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d"}, {"url": "https://git.kernel.org/stable/c/d42bec6e4f6d6d658be365539400b3314b76b2a7"}, {"url": "https://git.kernel.org/stable/c/4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nslip: bound decode() reads against the compressed packet length\n\nslhc_uncompress() parses a VJ-compressed TCP header by advancing a\npointer through the packet via decode() and pull16(). Neither helper\nbounds-checks against isize, and decode() masks its return with\n& 0xffff so it can never return the -1 that callers test for -- those\nerror paths are dead code.\n\nA short compressed frame whose change byte requests optional fields\nlets decode() read past the end of the packet. The over-read bytes\nare folded into the cached cstate and reflected into subsequent\nreconstructed packets.\n\nMake decode() and pull16() take the packet end pointer and return -1\nwhen exhausted. 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Neither helper\nbounds-checks against isize, and decode() masks its return with\n& 0xffff so it can never return the -1 that callers test for -- those\nerror paths are dead code.\n\nA short compressed frame whose change byte requests optional fields\nlets decode() read past the end of the packet. The over-read bytes\nare folded into the cached cstate and reflected into subsequent\nreconstructed packets.\n\nMake decode() and pull16() take the packet end pointer and return -1\nwhen exhausted. Add a bounds check before the TCP-checksum read.\nThe existing == -1 tests now do what they were always meant to."}], "id": "CVE-2026-45843", "lastModified": "2026-10-19T20:18:19.250", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-45843", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:17:54.838787Z", "version": "2.0.3"}}]}, "published": "2026-05-27T11:16:23.743", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/335957df4ed60f02a2ec0432fbedbf0cc7241d8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/37537e42e6df387398bee85cb85070cc80bb1e10"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cefe32639933d652614b0bd50f818f9af4af78f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6268f01ae989013671b526c883e92655342c6f6f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9aafba2f49e1fcccc2018816f5836a609c925879"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d42bec6e4f6d6d658be365539400b3314b76b2a7"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-126"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: slip: bound decode() reads against the compressed packet length", "id": "2481869", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481869"}, "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-125", "details": ["A flaw was found in the Linux kernel's Serial Line Internet Protocol (SLIP) implementation. The `slhc_uncompress()` function, which handles VJ-compressed TCP headers, fails to perform proper bounds checks during packet processing. A remote attacker could exploit this by sending a specially crafted compressed frame, causing an out-of-bounds read. This vulnerability may lead to information disclosure or data corruption in subsequent reconstructed packets."], "name": "CVE-2026-45843", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-45843\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45843\nhttps://lore.kernel.org/linux-cve-announce/2026052713-CVE-2026-45843-7efb@gregkh/T"], "threat_severity": "Moderate"}

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