268 lines
15 KiB
JSON
268 lines
15 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-2026-99056",
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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": "2026-09-25T10:25:14.388Z",
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"datePublished": "2026-10-23T12:22:42.234Z",
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"dateUpdated": "2026-10-30T12:41:22.353Z"
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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": "2026-10-30T12:41:22.353Z"
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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\nstrparser: make sure __strp_recv isn't running before tearing down the parser\n\nThe comment above strp_done() claims that if strp is stopped,\nstrp_recv will no longer be called. That's only true if the caller has\na mechanism (eg locking) to guarantee that strp_recv() calls that\nstarted before strp_stop() have completed by the time we call\nstrp_done().\n\nThis adds a dummy lock_sock/release_sock pair to guarantee that any\nin-flight strp_recv() (which runs under either bh_lock_sock or\nlock_sock, depending if it's called from ->sk_data_ready or strp_work)\nhas completed.\n\nOnly espintcp can be affected by this race condition, but this patch\nmakes sure no future user of strp can have the bug.\n\nThis could crash on strp->sk (\"general mode\" of strp), but this mode\nhas been here for 9 years and has never been used. It'll be gone soon,\nno point worrying about it.\n\nSwitch the stopped/paused/etc bits to u8's to avoid races between\nstrp_stop() and strp_pause/unpause().\n\nA reproducer has been published and turns the possible UAF into an\nexploit [1]."
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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 - An unprivileged local process can attach \"espintcp\" with setsockopt(TCP_ULP), then use a loopback peer to drive espintcp_data_ready()->strp_data_ready()->__strp_recv() while close() reaches espintcp_close()->strp_done(); a network peer alone cannot initiate the required local teardown.\nAC:L - The same process controls both race sides: it sets a finite SO_RCVTIMEO, sends complete keepalives plus a partial header that makes espintcp_parse() return 0 and strp_start_timer() rearm after strp_done() cancels, and concurrently closes the target socket. The race is repeatable and publicly exploited.\nPR:L - __sys_setsockopt()->tcp_setsockopt()->tcp_set_ulp()->espintcp_init_sk() contains no capability or authentication check for an already registered \"espintcp\" ULP. An ordinary local user can create the TCP pair, set the timeout, attach the ULP, and close it.\nUI:N - The attacking process performs the socket creation, TCP_ULP attachment, traffic generation, close, and heap reclaim itself; no action by another user is required.\nS:U - The reclaimed espintcp_ctx and its msg_timer_work execute within the host kernel reached by the attacking local process; this is a conventional local kernel privilege escalation and crosses no VM, IOMMU, or separate security authority.\nC:H - The freed espintcp_ctx can be reclaimed with a controlled user_key_payload, including msg_timer_work.timer.function and callback operands. The resulting kernel callback control and root execution permit access to arbitrary protected memory.\nI:H - The controlled timer.function and RDI-relative operands let the demonstrated iocg_flush_stat_upward gadget perform a chosen delta write to modprobe_path, producing root code execution.\nA:H - If the freed msg_timer_work is not coherently reclaimed, timer expiry consumes stale work_struct fields or calls an invalid timer.function, causing a kernel fault or panic; the published exploit also documents a crash-only variant."
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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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"Documentation/networking/strparser.rst",
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"include/net/strparser.h",
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"net/strparser/strparser.c"
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],
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"versions": [
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{
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"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
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"lessThan": "b09071e2f8460b35c7d355addad0fc7b31c6904d",
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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": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
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"lessThan": "933df60a465b1b82ff92dcd6870504da90ba4e9b",
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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": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
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"lessThan": "61cc5dac60d50dee06cf5c7b7ab246f9c825a715",
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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": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
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"lessThan": "a18dd388045dc7263d99a07db9de4e0f149ca8f1",
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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": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
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"lessThan": "9f3e9fe1b155e9b4572054d8d140586bc3512ecf",
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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": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
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"lessThan": "d2b5f637b9b67a79a50d42614d10653c13b4e449",
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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": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
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"lessThan": "eaa3a29004c063d7e9d5ea55636f693f67e6db0f",
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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": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
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"lessThan": "0984ebc631792acf8fff105112ee74a6b8f1efcc",
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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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"Documentation/networking/strparser.rst",
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"include/net/strparser.h",
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"net/strparser/strparser.c"
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],
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"versions": [
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{
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"version": "5.6",
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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": "5.6",
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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": "5.10.273",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.224",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.113",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.57",
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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": "7.2.11",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.6",
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"versionEndExcluding": "5.10.273"
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"versionEndExcluding": "6.6.160"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.6",
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"versionEndExcluding": "6.12.113"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/b09071e2f8460b35c7d355addad0fc7b31c6904d"
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},
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{
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"url": "https://git.kernel.org/stable/c/933df60a465b1b82ff92dcd6870504da90ba4e9b"
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},
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{
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"url": "https://git.kernel.org/stable/c/61cc5dac60d50dee06cf5c7b7ab246f9c825a715"
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},
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{
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"url": "https://git.kernel.org/stable/c/a18dd388045dc7263d99a07db9de4e0f149ca8f1"
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},
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{
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"url": "https://git.kernel.org/stable/c/9f3e9fe1b155e9b4572054d8d140586bc3512ecf"
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},
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{
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"url": "https://git.kernel.org/stable/c/d2b5f637b9b67a79a50d42614d10653c13b4e449"
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},
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{
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"url": "https://git.kernel.org/stable/c/eaa3a29004c063d7e9d5ea55636f693f67e6db0f"
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},
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{
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"url": "https://git.kernel.org/stable/c/0984ebc631792acf8fff105112ee74a6b8f1efcc"
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}
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],
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"title": "strparser: make sure __strp_recv isn't running before tearing down the parser",
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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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} |