CVE-2026-46331

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46331", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.112Z", "datePublished": "2026-06-16T06:26:21.066Z", "dateUpdated": "2026-10-15T01:21:40.294Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:25.966Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix pedit partial COW leading to page cache corruption\n\ntcf_pedit_act() computes the COW range for skb_ensure_writable()\nonce before the key loop using tcfp_off_max_hint, but the hint does\nnot account for the runtime header offset added by typed keys. This\ncan leave part of the write region un-COW'd.\n\nFix by moving skb_ensure_writable() inside the per-key loop where\nthe actual write offset is known, and add overflow checking on the\noffset arithmetic. For negative offsets (e.g. Ethernet header edits\nat ingress), use skb_cow() to COW the headroom instead. Guard\noffset_valid() against INT_MIN, where negation is undefined."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable pedit action is reached through local tc/rtnetlink configuration and local packet generation, not by unauthenticated network input alone. Even if remote traffic can traverse an already configured pedit rule, creating the exploitable action is a local operation.\nAC:L - There is no attacker-uncontrolled race; the attacker can choose the pedit key, header type, offset, and traffic shape. The partial COW condition is deterministic once suitable shared or page-cache-backed skbs are generated.\nPR:L - Installing the pedit action through RTM_NEWTFILTER requires CAP_NET_ADMIN in the network namespace. With unprivileged user namespaces, a basic local user can obtain namespace CAP_NET_ADMIN, so this is Low rather than High.\nUI:N - The attacker can configure the tc action and generate the triggering traffic without requiring any victim action. No user needs to open a file, mount a filesystem, or interact with crafted data.\nS:U - The vulnerability is in the kernel networking subsystem and impacts kernel-managed memory and page cache within the same security authority. It is a standard local kernel privilege-escalation/data-corruption issue, not a VM escape or separate-scope boundary bypass.\nC:H - The bug permits corruption of shared skb/page-cache memory outside the intended COW range, which is kernel memory/data corruption. Such corruption is defensibly usable for privilege escalation, after which protected information can be read.\nI:H - The vulnerable path gives attacker-influenced writes into shared page-cache-backed packet data that should have been private. This can corrupt protected data or code pages and is defensibly a high-integrity arbitrary data modification primitive.\nA:H - Repeated page cache or kernel memory corruption can crash the kernel, corrupt critical cached files, or destabilize networking and userspace execution. A kernel crash or system-wide corruption warrants High availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/tc_act/tc_pedit.h", "net/sched/act_pedit.c"], "versions": [{"version": "abe35bf3be51482593076d516a680d79e5fbc8e1", "lessThan": "544d857b42a1734b923040e13aa61a6fd4746cf2", "status": "affected", "versionType": "git"}, {"version": "b773640d5bb9e2acfd91e2695717af04d47aa116", "lessThan": "d5d01d35a5a7d36f7cb679b67d9cbdd5205672dc", "status": "affected", "versionType": "git"}, {"version": "8b796475fd7882663a870456466a4fb315cc1bd6", "lessThan": "a071e057518decc5e3bec89855758f5f8786f2c5", "status": "affected", "versionType": "git"}, {"version": "8b796475fd7882663a870456466a4fb315cc1bd6", "lessThan": "b685d6ef6f07a3b5ce814565a25f39f2157538a5", "status": "affected", "versionType": "git"}, {"version": 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from loading. Create a file `/etc/modprobe.d/disable-act_pedit.conf` with the following content:\n\n`install act_pedit /bin/true`\n\nThen, regenerate the initramfs and reboot the system for the changes to take effect. This may impact network traffic control functionality that relies on the pedit action."}], "x_generator": {"engine": "sadp-cli 1.0.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in the Linux kernel's traffic control packet editing (pedit) subsystem. In tcf_pedit_act(), the copy-on-write (COW) range for skb_ensure_writable() is computed once before iterating over edit keys, but the calculation does not account for runtime header offsets added by typed keys. This can leave part of the target write region without a proper copy-on-write, leading to an out-of-bounds write that corrupts page cache memory. A local attacker with the ability to configure traffic control rules could exploit this to escalate privileges or crash the system."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "Out-of-bounds Write"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-09-15T12:04:26.609Z"}}, {"affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "x_adpType": "supplier", "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:21:40.294Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-46331", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-06-29T14:06:32.936055Z"}}}], "references": [{"url": "https://github.com/sgkdev/packet_edit_meme/tree/main", "tags": ["exploit"]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-29T14:06:24.170Z"}}], "cna": {"title": "net/sched: fix pedit partial COW leading to page cache corruption", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable pedit action is reached through local tc/rtnetlink configuration and local packet generation, not by unauthenticated network input alone. Even if remote traffic can traverse an already configured pedit rule, creating the exploitable action is a local operation.\nAC:L - There is no attacker-uncontrolled race; the attacker can choose the pedit key, header type, offset, and traffic shape. The partial COW condition is deterministic once suitable shared or page-cache-backed skbs are generated.\nPR:L - Installing the pedit action through RTM_NEWTFILTER requires CAP_NET_ADMIN in the network namespace. With unprivileged user namespaces, a basic local user can obtain namespace CAP_NET_ADMIN, so this is Low rather than High.\nUI:N - The attacker can configure the tc action and generate the triggering traffic without requiring any victim action. No user needs to open a file, mount a filesystem, or interact with crafted data.\nS:U - The vulnerability is in the kernel networking subsystem and impacts kernel-managed memory and page cache within the same security authority. It is a standard local kernel privilege-escalation/data-corruption issue, not a VM escape or separate-scope boundary bypass.\nC:H - The bug permits corruption of shared skb/page-cache memory outside the intended COW range, which is kernel memory/data corruption. Such corruption is defensibly usable for privilege escalation, after which protected information can be read.\nI:H - The vulnerable path gives attacker-influenced writes into shared page-cache-backed packet data that should have been private. This can corrupt protected data or code pages and is defensibly a high-integrity arbitrary data modification primitive.\nA:H - Repeated page cache or kernel memory corruption can crash the kernel, corrupt critical cached files, or destabilize networking and userspace execution. A kernel crash or system-wide corruption warrants High availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "abe35bf3be51482593076d516a680d79e5fbc8e1", "lessThan": "544d857b42a1734b923040e13aa61a6fd4746cf2", "versionType": "git"}, {"status": "affected", "version": "b773640d5bb9e2acfd91e2695717af04d47aa116", "lessThan": "d5d01d35a5a7d36f7cb679b67d9cbdd5205672dc", "versionType": "git"}, {"status": "affected", "version": "8b796475fd7882663a870456466a4fb315cc1bd6", "lessThan": "a071e057518decc5e3bec89855758f5f8786f2c5", "versionType": "git"}, {"status": "affected", "version": "8b796475fd7882663a870456466a4fb315cc1bd6", "lessThan": "b685d6ef6f07a3b5ce814565a25f39f2157538a5", "versionType": "git"}, {"status": "affected", "version": "8b796475fd7882663a870456466a4fb315cc1bd6", "lessThan": "2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b", "versionType": "git"}, {"status": "affected", "version": "8b796475fd7882663a870456466a4fb315cc1bd6", "lessThan": "b198ed4e52580a7238c7c7082f03906f8b310313", "versionType": "git"}, {"status": "affected", "version": "8b796475fd7882663a870456466a4fb315cc1bd6", "lessThan": "3dee9d0c198faeb95d052c1b94c2958751a28512", "versionType": "git"}, {"status": "affected", "version": "8b796475fd7882663a870456466a4fb315cc1bd6", "lessThan": "899ee91156e57784090c5565e4f31bd7dbffbc5a", "versionType": "git"}, {"status": "affected", "version": "d0c38a914b0c4c21d553da801003d36979016726", "versionType": "git"}, {"status": "affected", "version": "2ec2dd7d51a9320151f275ddbb2b53260fb32ca1", "versionType": "git"}, {"status": "affected", "version": "c19cc520b3d69904e9518d401ad0df7f4702aca0", "versionType": "git"}, {"status": "affected", "version": "5.10.117", "lessThan": "5.10.260", "versionType": "semver"}, {"status": "affected", "version": "5.15.41", "lessThan": "5.15.211", "versionType": "semver"}, {"status": "affected", "version": "4.19.244", "lessThan": "4.20", "versionType": "semver"}, {"status": "affected", "version": "5.4.195", "lessThan": "5.5", "versionType": "semver"}, {"status": "affected", "version": "5.17.9", "lessThan": "5.18", "versionType": "semver"}], "programFiles": ["include/net/tc_act/tc_pedit.h", "net/sched/act_pedit.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.18"}, {"status": "unaffected", "version": "0", "lessThan": "5.18", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.260", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.211", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.177", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.144", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.94", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.36", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.13", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["include/net/tc_act/tc_pedit.h", "net/sched/act_pedit.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/544d857b42a1734b923040e13aa61a6fd4746cf2"}, {"url": "https://git.kernel.org/stable/c/d5d01d35a5a7d36f7cb679b67d9cbdd5205672dc"}, {"url": "https://git.kernel.org/stable/c/a071e057518decc5e3bec89855758f5f8786f2c5"}, {"url": "https://git.kernel.org/stable/c/b685d6ef6f07a3b5ce814565a25f39f2157538a5"}, {"url": "https://git.kernel.org/stable/c/2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b"}, {"url": "https://git.kernel.org/stable/c/b198ed4e52580a7238c7c7082f03906f8b310313"}, {"url": "https://git.kernel.org/stable/c/3dee9d0c198faeb95d052c1b94c2958751a28512"}, {"url": "https://git.kernel.org/stable/c/899ee91156e57784090c5565e4f31bd7dbffbc5a"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix pedit partial COW leading to page cache corruption\n\ntcf_pedit_act() computes the COW range for skb_ensure_writable()\nonce before the key loop using tcfp_off_max_hint, but the hint does\nnot account for the runtime header offset added by typed keys. This\ncan leave part of the write region un-COW'd.\n\nFix by moving skb_ensure_writable() inside the per-key loop where\nthe actual write offset is known, and add overflow checking on the\noffset arithmetic. For negative offsets (e.g. Ethernet header edits\nat ingress), use skb_cow() to COW the headroom instead. Guard\noffset_valid() against INT_MIN, where negation is undefined."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.260", "versionStartIncluding": "5.10.117"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.211", "versionStartIncluding": "5.15.41"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.177", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.144", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.94", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.36", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.13", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.19.244"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.4.195"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.17.9"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:25.966Z"}}}, "cveMetadata": {"cveId": "CVE-2026-46331", "state": "PUBLISHED", "dateUpdated": "2026-10-15T01:21:40.294Z", "dateReserved": "2026-05-13T15:03:33.112Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-16T06:26:21.066Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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the hint does\nnot account for the runtime header offset added by typed keys. This\ncan leave part of the write region un-COW'd.\n\nFix by moving skb_ensure_writable() inside the per-key loop where\nthe actual write offset is known, and add overflow checking on the\noffset arithmetic. For negative offsets (e.g. Ethernet header edits\nat ingress), use skb_cow() to COW the headroom instead. 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{}

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