{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-98068", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-98068", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-25T10:24:10.234Z", "updatedAt": "2026-10-19T09:13:17.906Z", "importedAt": "2026-10-24T01:58:41.756Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "net/rds: don't let rds_conn_shutdown() consume a concurrent drop", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: don't let rds_conn_shutdown() consume a concurrent drop\n\nrds_conn_shutdown() finishes by moving the path from\nRDS_CONN_DISCONNECTING to RDS_CONN_DOWN, and also accepts\nRDS_CONN_ERROR as the starting state of that final transition, so that\na FIN processed in softirq context during the teardown does not derail\nthe shutdown into a noisy error path.\n\nBut consuming that RDS_CONN_ERROR also consumes the shutdown pass that\ncame with it: rds_conn_path_drop() sets RDS_CONN_ERROR and then queues\ncp_down_w, and a pass that starts on a path already in RDS_CONN_DOWN\nis a no-op. For the FIN case that is harmless - the socket the FIN\narrived on is the very socket the teardown just released. It is not\nharmless for a dropper that attached something to the path first.\n\nrds_tcp_accept_one() is such a dropper. Its path claim in\nrds_tcp_accept_one_path() transitions RDS_CONN_DOWN ->\nRDS_CONN_CONNECTING, and a concurrent drop - a FIN on a previous\nsocket in softirq context, an administrative reset - can put the path\ninto RDS_CONN_ERROR between that claim and the state check that\nfollows, which accepts RDS_CONN_ERROR. The accept then installs the\nfreshly accepted socket with rds_tcp_set_callbacks() while the queued\nteardown - which sampled tc->t_sock before this socket existed - is\nstill running. rds_connect_path_complete() fails its transition to\nRDS_CONN_UP and drops the path again, queueing the pass that should\nreap the socket it just installed. If the in-flight shutdown's final\ntransition consumes that drop's RDS_CONN_ERROR, the queued pass finds\nthe path in RDS_CONN_DOWN and does nothing. The installed socket is\nnever torn down: it sits established with its callbacks armed and its\nrds_tcp_connection on rds_tcp_tc_list, the peer sees a connection that\nnothing ever reads, and the path is wedged in RDS_CONN_DOWN until some\nlater event drops it again. Reproduced with widened race windows as\nan ever-growing receive queue on a socket owned by a path stuck in\nRDS_CONN_DOWN, with the peer's send path wedged behind it.\n\nMake the final transition only DISCONNECTING -> DOWN. If it fails\nbecause the path is in RDS_CONN_ERROR, a drop raced the teardown:\ncancel the reconnect timer and clear RDS_RECONNECT_PENDING - the one\npiece of the skipped tail that must not be left behind - and return,\nletting the pass the drop queued finish the job: it tears down\nwhatever attached to the path in the meantime, completes the\ntransition to RDS_CONN_DOWN, and re-arms the reconnect from its own\ntail.\n\nThe timer quiesce in that branch matters because the racing drop does\nnot always queue that pass: rds_conn_path_drop() returns without\nqueueing when a destroy is pending - exactly the situation during a\nnetns teardown or module unload, when a FIN on the dying socket is\nprocessed while rds_conn_path_destroy() flushes cp_down_w. If the\nflushed pass is the one that takes this return, no later pass exists,\nand rds_conn_path_destroy() would find cp_conn_w still armed\n(WARN_ON) and then free a path whose reconnect timer can still fire.\nWith the cancel in the branch, every exit of a shutdown pass leaves\nthe timer quiesced no matter which pass completes the transition.\n\nThe FIN case keeps making progress, one pass later and still without\nnoisy logging. Any other state keeps today's rds_conn_path_error()\nhandling; no current cp_state writer can leave a DISCONNECTING path\nin anything but RDS_CONN_ERROR (every other writer is a cmpxchg from\na non-DISCONNECTING state), so that branch is defensive.\n\nOn kernels without the preceding patches the same hazard exists with\nthe sample-based quiesce; the fix applies there equally.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "e97656d03ca0cea888a0b9d382abce8233771f31", "status": "affected", "versionType": "git", "lessThan": "f777c602d3e15d3414b53f760147687bd56b03f2" }, { "version": "e97656d03ca0cea888a0b9d382abce8233771f31", "status": "affected", "versionType": "git", "lessThan": "7cb11257aa3e5ef0bedfd5d55ac60bb00347aa97" }, { "version": "e97656d03ca0cea888a0b9d382abce8233771f31", "status": "affected", "versionType": "git", "lessThan": "4980ce260205001d582a7b3cb5eab29877777fbc" }, { "version": "e97656d03ca0cea888a0b9d382abce8233771f31", "status": "affected", "versionType": "git", "lessThan": "0ec75c69918b7f6a1a5e3fb6442925246a9ec86b" }, { "version": "e97656d03ca0cea888a0b9d382abce8233771f31", "status": "affected", "versionType": "git", "lessThan": "bd1cb197a07111ca8d4f4c21411c56a3c85a9797" }, { "version": "e97656d03ca0cea888a0b9d382abce8233771f31", "status": "affected", "versionType": "git", "lessThan": "4cb9b6d3d31a2dbaa5469981c2c4c03e9acc7aca" }, { "version": "e97656d03ca0cea888a0b9d382abce8233771f31", "status": "affected", "versionType": "git", "lessThan": "2941561395066be856a53626d4ca973dd9c982b2" }, { "version": "e97656d03ca0cea888a0b9d382abce8233771f31", "status": "affected", "versionType": "git", "lessThan": "260c6308fe2e19ad519389d44d582e292aecc3af" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.12", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.12" }, { "version": "5.10.271", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.222", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.189", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.158", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.111", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.53", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.7", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }