159 lines
8.7 KiB
JSON
159 lines
8.7 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-43481",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-01T14:12:56.012Z",
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"datePublished": "2026-05-13T15:08:29.116Z",
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"dateUpdated": "2026-08-05T12:28:12.884Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:28:12.884Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet-shapers: don't free reply skb after genlmsg_reply()\n\ngenlmsg_reply() hands the reply skb to netlink, and\nnetlink_unicast() consumes it on all return paths, whether the\nskb is queued successfully or freed on an error path.\n\nnet_shaper_nl_get_doit() and net_shaper_nl_cap_get_doit()\ncurrently jump to free_msg after genlmsg_reply() fails and call\nnlmsg_free(msg), which can hit the same skb twice.\n\nReturn the genlmsg_reply() error directly and keep free_msg\nonly for pre-reply failures."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable code is reached by local userspace through AF_NETLINK/NETLINK_GENERIC requests to the net-shaper family, not by received network packets. A plausible cloud/server deployment with a shaper-capable netdev such as MANA or iavf exposes this local control path.\nAC:L - The attacker can directly send the vulnerable GET or CAP_GET request and can make genlmsg_reply() fail by controlling the destination netlink socket state, such as filling its receive queue or closing it. No uncontrollable race or unusual memory-layout prerequisite is needed to trigger the double free.\nPR:L - The affected GET and CAP_GET operations do not have GENL_ADMIN_PERM or GENL_UNS_ADMIN_PERM; only the mutating operations require admin privileges. A basic unprivileged local user in a namespace containing a shaper-capable netdev can reach the vulnerable handlers.\nUI:N - Exploitation only requires the attacker to issue crafted netlink requests. No victim user action is required.\nS:U - The vulnerable component and impacted kernel resources are within the same local kernel security authority. This is standard local kernel compromise/DoS territory, not a VM, IOMMU, or other scope boundary escape.\nC:H - The bug double-frees a netlink reply sk_buff after netlink has already consumed it, creating kernel heap corruption/use-after-free potential. Under the required high-side scoring for memory corruption, this can be leveraged for high confidentiality impact.\nI:H - A double free of an skb is kernel heap memory corruption and can plausibly be shaped into write/control-flow primitives. Under the required high-side scoring for UAF-style corruption, integrity impact is high.\nA:H - Even without full exploitation, the double free can trigger allocator corruption, refcount faults, oopses, or panics. The attacker can repeatedly trigger the local netlink path, so availability impact is high."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/shaper/shaper.c"
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],
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"versions": [
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{
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"version": "4b623f9f0f59652ea71fcb27d60b4c3b65126dbb",
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"lessThan": "8738dcc844fff7d0157ee775230e95df3b1884d7",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4b623f9f0f59652ea71fcb27d60b4c3b65126dbb",
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"lessThan": "83f7b54242d0abbfce35a55c01322f50962ed3ee",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4b623f9f0f59652ea71fcb27d60b4c3b65126dbb",
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"lessThan": "57885276cc16a2e2b76282c808a4e84cbecb3aae",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/shaper/shaper.c"
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],
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"versions": [
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{
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"version": "6.13",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.13",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.19",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.19.9",
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"lessThanOrEqual": "6.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.13",
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"versionEndExcluding": "6.18.19"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.13",
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"versionEndExcluding": "6.19.9"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.13",
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"versionEndExcluding": "7.0"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8738dcc844fff7d0157ee775230e95df3b1884d7"
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},
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{
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"url": "https://git.kernel.org/stable/c/83f7b54242d0abbfce35a55c01322f50962ed3ee"
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},
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{
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"url": "https://git.kernel.org/stable/c/57885276cc16a2e2b76282c808a4e84cbecb3aae"
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}
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],
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"title": "net-shapers: don't free reply skb after genlmsg_reply()",
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"x_generator": {
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}
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} |