138 lines
8.3 KiB
JSON
138 lines
8.3 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-2026-89459",
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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": "2026-09-11T19:38:34.707Z",
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"datePublished": "2026-09-11T19:43:22.007Z",
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"dateUpdated": "2026-10-19T08:47:08.639Z"
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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": "2026-10-19T08:47:08.639Z"
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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\ns390/percpu: Fix MVIY_PERCPU() with older binutils\n\nCommit a737737cdb9c (\"s390/percpu: Infrastructure for more efficient\nthis_cpu operations\") introduced MVIY_PERCPU(), which stringifies\narguments that are already C string literals. This generates an\nassembler macro invocation with whitespace-separated quoted arguments:\n\n GEN_MVIY \"459712\" \"%r3\"\n\nGNU as versions prior to binutils 2.39 drop the separating whitespace\nbetween quoted macro arguments during input scrubbing. They\nconsequently parse the invocation as a single argument and emit\nrepeated warnings:\n\n Warning: missing closing `\"'\n\nThe .ifc in GEN_MVIY never matches and GNU as exits successfully\nwithout emitting the mviy instruction. As a result, the interrupted\nper-CPU sequence is not marked in lowcore and the exception return\npath cannot repair the per-CPU address register after migration.\n\nAll MVIY_PERCPU() callers pass C string literals. Use them directly\nand separate the assembler macro arguments with an explicit comma. The\nresulting invocation is:\n\n GEN_MVIY 459712, %r3\n\nThis form is unambiguous for GNU as and LLVM's integrated assembler.\nThis behavior was fixed in GNU as from binutils 2.39, but Linux\nsupports binutils 2.30."
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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:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7,
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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 omitted mviy start marker is in s390 this_cpu_read/write/add sequences reached from local syscalls (mm/swap, memcg, vmalloc) and user-namespace nftables; this is an arch per-CPU primitive, not a packet parser, ksmbd/nfsd handler, or USB path.\nAC:H - The op is wrong only if an interrupt or preemption and a CPU migration both occur after AG adds the old CPU offset and before the atomic instruction; that one-instruction window is not attacker-timed, even with affinity bouncing on default PREEMPT_LAZY s390.\nPR:L - Any unprivileged local user can drive this_cpu_* via ordinary syscalls, and nft_ct's this_cpu_read(nft_ct_pcpu_template) is reachable with CAP_NET_ADMIN in a user namespace; init-namespace root is not required.\nUI:N - The attacker triggers the unmarked this_cpu sequences from their own process (syscalls or locally generated packets); no victim mount, file open, or other interaction is required.\nS:U - Stale per-CPU pointers are used inside the same host kernel after migration; this is not a KVM/Xen guest-to-host escape or IOMMU/DMA boundary bypass.\nC:H - After migration, this_cpu_read uses another CPU's pointer-typed slots (percpu_swap_cluster.si, nft_ct_pcpu_template, page-pool/socket pointers) without that CPU's locking, which can disclose kernel objects and is memory corruption leverageable for info disclosure.\nI:H - The matching this_cpu_write/add then mutates the previous CPU's per-CPU state (swap cluster cache, conntrack templates, other CPU-local structures that assume exclusive access), which is kernel memory corruption exploitable toward control-flow hijack.\nA:H - A stale per-CPU pointer after migration can oops or panic (NULL vmalloc ne_fit_preload_node, inconsistent swap_info, conntrack refcount UAF), which is a full kernel availability loss on SMP s390."
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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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"arch/s390/include/asm/percpu.h"
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],
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"versions": [
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{
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"version": "a737737cdb9c94e40a9926cdc2320f874c05d709",
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"lessThan": "91770b08a120967077ae78600612f18bc5ee3caf",
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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": "a737737cdb9c94e40a9926cdc2320f874c05d709",
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"lessThan": "101782f8945a125044347312d74d488c05741c4a",
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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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"arch/s390/include/asm/percpu.h"
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],
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"versions": [
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{
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"version": "7.2",
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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": "7.2",
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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": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "7.2",
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"versionEndExcluding": "7.2.4"
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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": "7.2",
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"versionEndExcluding": "7.3"
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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/91770b08a120967077ae78600612f18bc5ee3caf"
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},
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{
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"url": "https://git.kernel.org/stable/c/101782f8945a125044347312d74d488c05741c4a"
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}
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],
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"title": "s390/percpu: Fix MVIY_PERCPU() with older binutils",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |