143 lines
7.2 KiB
JSON
143 lines
7.2 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-2026-43121",
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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": "2026-05-01T14:12:55.987Z",
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"datePublished": "2026-05-06T11:27:08.216Z",
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"dateUpdated": "2026-05-11T22:18:09.791Z"
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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": "2026-05-11T22:18:09.791Z"
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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\nio_uring/zcrx: fix user_ref race between scrub and refill paths\n\nThe io_zcrx_put_niov_uref() function uses a non-atomic\ncheck-then-decrement pattern (atomic_read followed by separate\natomic_dec) to manipulate user_refs. This is serialized against other\ncallers by rq_lock, but io_zcrx_scrub() modifies the same counter with\natomic_xchg() WITHOUT holding rq_lock.\n\nOn SMP systems, the following race exists:\n\n CPU0 (refill, holds rq_lock) CPU1 (scrub, no rq_lock)\n put_niov_uref:\n atomic_read(uref) - 1\n // window opens\n atomic_xchg(uref, 0) - 1\n return_niov_freelist(niov) [PUSH #1]\n // window closes\n atomic_dec(uref) - wraps to -1\n returns true\n return_niov(niov)\n return_niov_freelist(niov) [PUSH #2: DOUBLE-FREE]\n\nThe same niov is pushed to the freelist twice, causing free_count to\nexceed nr_iovs. Subsequent freelist pushes then perform an out-of-bounds\nwrite (a u32 value) past the kvmalloc'd freelist array into the adjacent\nslab object.\n\nFix this by replacing the non-atomic read-then-dec in\nio_zcrx_put_niov_uref() with an atomic_try_cmpxchg loop that atomically\ntests and decrements user_refs. This makes the operation safe against\nconcurrent atomic_xchg from scrub without requiring scrub to acquire\nrq_lock.\n\n[pavel: removed a warning and a comment]"
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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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"io_uring/zcrx.c"
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],
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"versions": [
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{
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"version": "34a3e60821ab9f335a58d43a88cccdbefdebdec3",
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"lessThan": "a94f096e28bfc7975163a6b80f1c8f323efe317a",
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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": "34a3e60821ab9f335a58d43a88cccdbefdebdec3",
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"lessThan": "485dc691257b96e6d3bdc25b0eff2daadcc5c46c",
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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": "34a3e60821ab9f335a58d43a88cccdbefdebdec3",
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"lessThan": "003049b1c4fb8aabb93febb7d1e49004f6ad653b",
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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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"io_uring/zcrx.c"
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],
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"versions": [
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{
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"version": "6.15",
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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": "6.15",
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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": "6.18.16",
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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": "6.19.6",
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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": "6.15",
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"versionEndExcluding": "6.18.16"
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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": "6.15",
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"versionEndExcluding": "6.19.6"
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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": "6.15",
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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/a94f096e28bfc7975163a6b80f1c8f323efe317a"
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},
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{
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"url": "https://git.kernel.org/stable/c/485dc691257b96e6d3bdc25b0eff2daadcc5c46c"
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},
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{
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"url": "https://git.kernel.org/stable/c/003049b1c4fb8aabb93febb7d1e49004f6ad653b"
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}
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],
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"title": "io_uring/zcrx: fix user_ref race between scrub and refill paths",
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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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} |