{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98570", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.357Z", "datePublished": "2026-10-18T15:18:36.308Z", "dateUpdated": "2026-10-19T09:21:55.765Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:21:55.765Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: keep room for the mac header in dst_dev_overhead()\n\nThe seg6, ioam6 and rpl lwtunnels size their skb_cow_head() request as\nthe length they are about to push plus dst_dev_overhead(), then push the\nnew headers and rebuild the mac header below them with\nskb_mac_header_rebuild(). That rebuild needs skb->mac_len of headroom,\nbut dst_dev_overhead() leaves LL_RESERVED_SPACE() of the egress device,\n16 bytes for plain Ethernet.\n\nWhere the mac header is longer than that, as it is on ingress through a\nVLAN device with reorder_hdr off, the rebuild runs out of room:\nskb_set_mac_header(skb, -skb->mac_len) computes a negative offset,\nstores it unchecked in the u16 skb->mac_header, and the memmove that\nfollows writes skb->mac_len bytes about 64 KB past skb->head.\nForwarding plain ping6 traffic through such a device reproduces it on\nall five seg6 encapsulation modes and on the rpl and ioam6 inline paths;\nskb->mac_header comes back as 65534 on a 704-byte head.\n\nReturn the larger of the two. The helper already returns skb->mac_len\nwhen it has no dst, so this only makes the other branch agree, and it\ncovers every caller rather than each call site in turn." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/dst.h" ], "versions": [ { "version": "dce525185bc92864e5a318040285ee070563fe34", "lessThan": "36c07127924f11fc5741a780abcaaf808fe9ef13", "status": "affected", "versionType": "git" }, { "version": "dce525185bc92864e5a318040285ee070563fe34", "lessThan": "87cd6b717e4069dca34e0866e57eaeb44d3b173e", "status": "affected", "versionType": "git" }, { "version": "8471e228448a818e4c27cab4b681b2e758e46cf5", "status": "affected", "versionType": "git" }, { "version": "c432cd18a07b623651ed15ea167bd303467004cc", "status": "affected", "versionType": "git" }, { "version": "634710a372ba65bee667c2f6e58a97658c639eab", "status": "affected", "versionType": "git" }, { "version": "c447c5a9c47bb4858ab12bf90879fe595d2b7f46", "status": "affected", "versionType": "git" }, { "version": "ab9de9c48316d2622d3bf353916b99971570e2c9", "status": "affected", "versionType": "git" }, { "version": "2fcc9f3798ef82399564d247458e69abd10e683b", "status": "affected", "versionType": "git" }, { "version": "371d8dc298b4f59e99b4564ac5d906fce0932c69", "status": "affected", "versionType": "git" }, { "version": "b26f015dfb07b6be12d005a0ed0c5c43b7bedbf3", "status": "affected", "versionType": "git" }, { "version": "c0b11dc50590e10590b39dcda79835cd32f49d00", "status": "affected", "versionType": "git" }, { "version": "4c12c3c8abd8b888945d31e7bdbb0d8b73032fc5", "status": "affected", "versionType": "git" }, { "version": "25d8e065c7972dc98fd7a4cac322d5367eaede88", "status": "affected", "versionType": "git" }, { "version": "4a855c5aec41bf84922224ab7a74e088776e3ac4", "status": "affected", "versionType": "git" }, { "version": "a9f0407414e16176fdbbbd298c9e18d6dfdf96bc", "status": "affected", "versionType": "git" }, { "version": "6.12.16", "lessThan": "6.13", "status": "affected", "versionType": "semver" }, { "version": "6.13.4", "lessThan": "6.14", "status": "affected", "versionType": "semver" }, { "version": "5.15.179", "lessThan": "5.16", "status": "affected", "versionType": "semver" }, { "version": "6.1.130", "lessThan": "6.2", "status": "affected", "versionType": "semver" }, { "version": "6.6.81", "lessThan": "6.7", "status": "affected", "versionType": "semver" }, { "version": "5.10.235", "lessThan": "5.11", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/dst.h" ], "versions": [ { "version": "6.14", "status": "affected" }, { "version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.9", "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": "6.14", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.179" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.81" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.235" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.179" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.81" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/36c07127924f11fc5741a780abcaaf808fe9ef13" }, { "url": "https://git.kernel.org/stable/c/87cd6b717e4069dca34e0866e57eaeb44d3b173e" } ], "title": "net: ipv6: keep room for the mac header in dst_dev_overhead()", "x_generator": { "engine": "bippy-1.2.0" } } } }