{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-99056", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.388Z", "datePublished": "2026-10-23T12:22:42.234Z", "dateUpdated": "2026-10-24T14:10:15.756Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-24T14:10:15.756Z" }, "descriptions": [ { "lang": "en", "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]." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "Documentation/networking/strparser.rst", "include/net/strparser.h", "net/strparser/strparser.c" ], "versions": [ { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "a18dd388045dc7263d99a07db9de4e0f149ca8f1", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "9f3e9fe1b155e9b4572054d8d140586bc3512ecf", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "d2b5f637b9b67a79a50d42614d10653c13b4e449", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "eaa3a29004c063d7e9d5ea55636f693f67e6db0f", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "0984ebc631792acf8fff105112ee74a6b8f1efcc", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "Documentation/networking/strparser.rst", "include/net/strparser.h", "net/strparser/strparser.c" ], "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.11", "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": "5.6", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.12.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.18.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a18dd388045dc7263d99a07db9de4e0f149ca8f1" }, { "url": "https://git.kernel.org/stable/c/9f3e9fe1b155e9b4572054d8d140586bc3512ecf" }, { "url": "https://git.kernel.org/stable/c/d2b5f637b9b67a79a50d42614d10653c13b4e449" }, { "url": "https://git.kernel.org/stable/c/eaa3a29004c063d7e9d5ea55636f693f67e6db0f" }, { "url": "https://git.kernel.org/stable/c/0984ebc631792acf8fff105112ee74a6b8f1efcc" } ], "title": "strparser: make sure __strp_recv isn't running before tearing down the parser", "x_generator": { "engine": "bippy-1.2.0" } } } }