{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23239", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.989Z", "datePublished": "2026-03-10T17:28:26.190Z", "dateUpdated": "2026-08-05T12:20:49.864Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:49.864Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nespintcp: Fix race condition in espintcp_close()\n\nThis issue was discovered during a code audit.\n\nAfter cancel_work_sync() is called from espintcp_close(),\nespintcp_tx_work() can still be scheduled from paths such as\nthe Delayed ACK handler or ksoftirqd.\nAs a result, the espintcp_tx_work() worker may dereference a\nfreed espintcp ctx or sk.\n\nThe following is a simple race scenario:\n\n cpu0 cpu1\n\n espintcp_close()\n cancel_work_sync(&ctx->work);\n espintcp_write_space()\n schedule_work(&ctx->work);\n\nTo prevent this race condition, cancel_work_sync() is\nreplaced with disable_work_sync()." } ], "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 - The attacker must be a local user to create a TCP socket and set the espintcp ULP via setsockopt(TCP_ULP). This cannot be triggered remotely without local socket access.\nAC:L - The attacker controls both sides of the race: they trigger close() and control the remote peer (e.g., localhost connection) to send TCP ACKs that fire write_space, reliably creating the race condition.\nPR:L - No capability checks exist in the TCP_ULP setsockopt path or espintcp_init_sk(). Any unprivileged local user can set up an espintcp ULP socket and trigger this bug.\nUI:N - No user interaction is required; the attacker autonomously creates the socket, sets the ULP, and triggers the race.\nS:U - The vulnerability is a kernel-level use-after-free that does not cross a security boundary such as a VM or sandbox.\nC:H - The use-after-free on espintcp_ctx and sock structures allows an attacker to control freed object contents via heap spraying, enabling arbitrary kernel memory reads.\nI:H - The use-after-free enables heap spraying and arbitrary write primitives through the freed espintcp_ctx and sock structures, allowing potential kernel code execution.\nA:H - The use-after-free causes kernel crashes (oops/panic) when the work function dereferences freed memory, providing reliable denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/xfrm/espintcp.c" ], "versions": [ { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "f7ad8b1d0e421c524604d5076b73232093490d5c", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "664e9df53226b4505a0894817ecad2c610ab11d8", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "022ff7f347588de6e17879a1da6019647b21321b", "status": "affected", "versionType": "git" }, { "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "e1512c1db9e8794d8d130addd2615ec27231d994", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/xfrm/espintcp.c" ], "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "6.12.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.18.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f7ad8b1d0e421c524604d5076b73232093490d5c" }, { "url": "https://git.kernel.org/stable/c/664e9df53226b4505a0894817ecad2c610ab11d8" }, { "url": "https://git.kernel.org/stable/c/022ff7f347588de6e17879a1da6019647b21321b" }, { "url": "https://git.kernel.org/stable/c/e1512c1db9e8794d8d130addd2615ec27231d994" } ], "title": "espintcp: Fix race condition in espintcp_close()", "x_generator": { "engine": "bippy-1.2.0" } } } }