In the Linux kernel, the following vulnerability has been resolved: tcp: challenge ACK for non-exact RST in SYN-RECEIVED The SYN-RECEIVED request-socket path in tcp_check_req() accepts an in-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A non-exact RST therefore removes the request instead of eliciting a challenge ACK. RFC 9293 section 3.10.7.4 applies the RFC 5961 reset check in SYN-RECEIVED: an exact RST resets the connection, while a non-exact in-window RST must trigger a challenge ACK and be dropped. Apply that check before the ACK-field validation, following the RFC sequence-number, RST, then ACK processing order. Factor the per-netns challenge ACK quota out of tcp_send_challenge_ack() so request sockets can share it. Use the request socket's send_ack() callback and its own out-of-window ACK timestamp to send and rate-limit the response.

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4788 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4788-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                        Ben Hutchings     September 19, 2026                            https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : linux-6.12     Version        : 6.12.107-1~deb12u1     CVE ID         : CVE-2025-38525 CVE-2025-40054 CVE-2025-40074 CVE-2026-43197                      CVE-2026-53092 CVE-2026-64017 CVE-2026-64216 CVE-2026-64581                      CVE-2026-64586 CVE-2026-68082 CVE-2026-68118 CVE-2026-68132                      CVE-2026-68138 CVE-2026-68159 CVE-2026-68166 CVE-2026-68169                      CVE-2026-68198 CVE-2026-68253 CVE-2026-68254 CVE-2026-68264                      CVE-2026-68266 CVE-2026-68267 CVE-2026-68273 CVE-2026-68276                      CVE-2026-68322 CVE-2026-68367 CVE-2026-68431 CVE-2026-68451                      CVE-2026-68452 CVE-2026-68480 CVE-2026-72111 CVE-2026-74440                      CVE-2026-74441 CVE-2026-74442 CVE-2026-74443 CVE-2026-74444                      CVE-2026-74445 CVE-2026-74446 CVE-2026-74447 CVE-2026-74448                      CVE-2026-74450 CVE-2026-74451 CVE-2026-74452 CVE-2026-74453                      CVE-2026-74454 CVE-2026-74455 CVE-2026-74456 CVE-2026-74457                      CVE-2026-74458 CVE-2026-74459 CVE-2026-74460 CVE-2026-74461                      CVE-2026-74463 CVE-2026-74464 CVE-2026-74465 CVE-2026-74467                      CVE-2026-74468 CVE-2026-74469 CVE-2026-74470 CVE-2026-74471                      CVE-2026-74472 CVE-2026-74473 CVE-2026-74474 CVE-2026-74475                      CVE-2026-74476 CVE-2026-74478 CVE-2026-74479 CVE-2026-74480                      CVE-2026-74481 CVE-2026-74482 CVE-2026-74483 CVE-2026-74484                      CVE-2026-74485 CVE-2026-74487 CVE-2026-74488 CVE-2026-74490                      CVE-2026-74492 CVE-2026-74493 CVE-2026-74494 CVE-2026-74495                      CVE-2026-74497 CVE-2026-74498 CVE-2026-74499 CVE-2026-74500                      CVE-2026-74501 CVE-2026-74502 CVE-2026-74503 CVE-2026-74504                      CVE-2026-74505 CVE-2026-74507 CVE-2026-74508 CVE-2026-74509                      CVE-2026-74510 CVE-2026-74512 CVE-2026-74514 CVE-2026-74515                      CVE-2026-74516 CVE-2026-74517 CVE-2026-74518 CVE-2026-74519                      CVE-2026-74522 CVE-2026-74523 CVE-2026-74524 CVE-2026-74525                      CVE-2026-74531 CVE-2026-74532 CVE-2026-74535 CVE-2026-74536                      CVE-2026-74540 CVE-2026-74541 CVE-2026-74543 CVE-2026-74545                      CVE-2026-74546 CVE-2026-74547 CVE-2026-74548 CVE-2026-74549                      CVE-2026-74550 CVE-2026-74551 CVE-2026-74552 CVE-2026-74553                      CVE-2026-74555 CVE-2026-74556 CVE-2026-74557 CVE-2026-74563                      CVE-2026-74564 CVE-2026-74565 CVE-2026-74566 CVE-2026-74567                      CVE-2026-74569 CVE-2026-74572 CVE-2026-74574 CVE-2026-74575                      CVE-2026-74576 CVE-2026-74577 CVE-2026-74579 CVE-2026-74580                      CVE-2026-74581 CVE-2026-74582 CVE-2026-74583 CVE-2026-74585                      CVE-2026-74586 CVE-2026-74587 CVE-2026-74588 CVE-2026-74589                      CVE-2026-74590 CVE-2026-74592 CVE-2026-74594 CVE-2026-74595                      CVE-2026-74597 CVE-2026-74598 CVE-2026-74599 CVE-2026-74601                      CVE-2026-74602 CVE-2026-74603 CVE-2026-74604 CVE-2026-74606                      CVE-2026-74607 CVE-2026-74608 CVE-2026-74609 CVE-2026-74610                      CVE-2026-74612 CVE-2026-74613 CVE-2026-74614 CVE-2026-74615                      CVE-2026-74616 CVE-2026-74618 CVE-2026-74619 CVE-2026-74620                      CVE-2026-74621 CVE-2026-74622 CVE-2026-74623 CVE-2026-74624                      CVE-2026-74625 CVE-2026-74626 CVE-2026-74628 CVE-2026-74630                      CVE-2026-74631 CVE-2026-74632 CVE-2026-74634 CVE-2026-74635                      CVE-2026-74636 CVE-2026-74637 CVE-2026-74641 CVE-2026-74644                      CVE-2026-74646 CVE-2026-74647 CVE-2026-74648 CVE-2026-74649                      CVE-2026-74650 CVE-2026-74651 CVE-2026-74653 CVE-2026-74654                      CVE-2026-74655 CVE-2026-74656 CVE-2026-74657 CVE-2026-74658                      CVE-2026-74659 CVE-2026-74660 CVE-2026-74661 CVE-2026-74662                      CVE-2026-74663 CVE-2026-74664 CVE-2026-74665 CVE-2026-74666                      CVE-2026-74667 CVE-2026-74668 CVE-2026-74669 CVE-2026-74670                      CVE-2026-74671 CVE-2026-74672 CVE-2026-74673 CVE-2026-74675                      CVE-2026-74676 CVE-2026-74677 CVE-2026-74678 CVE-2026-74679                      CVE-2026-74680 CVE-2026-74682 CVE-2026-74683 CVE-2026-74684                      CVE-2026-74685 CVE-2026-74688 CVE-2026-74689 CVE-2026-74691                      CVE-2026-74692 CVE-2026-74693 CVE-2026-74694 CVE-2026-74696                      CVE-2026-74700 CVE-2026-74701 CVE-2026-74704 CVE-2026-74705                      CVE-2026-74710 CVE-2026-74712 CVE-2026-74714 CVE-2026-74717                      CVE-2026-74718 CVE-2026-74719 CVE-2026-74720 CVE-2026-74722                      CVE-2026-74724 CVE-2026-74725 CVE-2026-74726 CVE-2026-74730                      CVE-2026-74732 CVE-2026-74736 CVE-2026-74737 CVE-2026-74739                      CVE-2026-74740 CVE-2026-74742 CVE-2026-74743 CVE-2026-74744                      CVE-2026-74746 CVE-2026-74748 CVE-2026-80522 CVE-2026-80525                      CVE-2026-80526 CVE-2026-80527 CVE-2026-80528 CVE-2026-80529                      CVE-2026-80530 CVE-2026-80531 CVE-2026-80532 CVE-2026-80533                      CVE-2026-80534 CVE-2026-80535 CVE-2026-80536 CVE-2026-80539                      CVE-2026-80540 CVE-2026-80541 CVE-2026-80547 CVE-2026-80548                      CVE-2026-80549 CVE-2026-80550 CVE-2026-80551 CVE-2026-80552                      CVE-2026-80553 CVE-2026-80554 CVE-2026-80555 CVE-2026-80556                      CVE-2026-80557 CVE-2026-80558 CVE-2026-80559 CVE-2026-80560                      CVE-2026-80561 CVE-2026-80562 CVE-2026-80563 CVE-2026-80565                      CVE-2026-80566 CVE-2026-80567 CVE-2026-80568 CVE-2026-80569                      CVE-2026-80570 CVE-2026-80572 CVE-2026-80573 CVE-2026-80574                      CVE-2026-80575 CVE-2026-80576 CVE-2026-80577 CVE-2026-80578                      CVE-2026-80583 CVE-2026-80584 CVE-2026-80585 CVE-2026-80586                      CVE-2026-80587 CVE-2026-80589 CVE-2026-80590 CVE-2026-80678                      CVE-2026-80679 CVE-2026-80680 CVE-2026-80681 CVE-2026-80684                      CVE-2026-80686 CVE-2026-80689 CVE-2026-80691 CVE-2026-80694                      CVE-2026-80695 CVE-2026-80696 CVE-2026-80700 CVE-2026-80702                      CVE-2026-80703 CVE-2026-80704 CVE-2026-80706 CVE-2026-80707                      CVE-2026-80708 CVE-2026-80709 CVE-2026-80710 CVE-2026-80711                      CVE-2026-80714 CVE-2026-80715 CVE-2026-80716 CVE-2026-80717                      CVE-2026-80718 CVE-2026-80722 CVE-2026-80723 CVE-2026-80725                      CVE-2026-80726 CVE-2026-80727 CVE-2026-80728 CVE-2026-80730                      CVE-2026-80731 CVE-2026-80732 CVE-2026-80733 CVE-2026-80736                      CVE-2026-80737 CVE-2026-80739 CVE-2026-80742 CVE-2026-80743                      CVE-2026-80744 CVE-2026-80749 CVE-2026-80752 CVE-2026-80754                      CVE-2026-80756 CVE-2026-80757 CVE-2026-80759 CVE-2026-80763                      CVE-2026-80764 CVE-2026-80765 CVE-2026-80767 CVE-2026-80770                      CVE-2026-80771 CVE-2026-80772 CVE-2026-80779 CVE-2026-80781                      CVE-2026-80782 CVE-2026-80784 CVE-2026-80788 CVE-2026-80789                      CVE-2026-80790 CVE-2026-80791 CVE-2026-80792 CVE-2026-80793                      CVE-2026-80794 CVE-2026-80795 CVE-2026-80797 CVE-2026-80798                      CVE-2026-80799 CVE-2026-80800 CVE-2026-80801 CVE-2026-80802                      CVE-2026-80803 CVE-2026-80805 CVE-2026-80808 CVE-2026-80809                      CVE-2026-80812 CVE-2026-80814 CVE-2026-80815 CVE-2026-80819                      CVE-2026-80820 CVE-2026-80823 CVE-2026-80887 CVE-2026-80888                      CVE-2026-80889 CVE-2026-80890 CVE-2026-80891 CVE-2026-80892                      CVE-2026-80893 CVE-2026-80894 CVE-2026-80901 CVE-2026-80902                      CVE-2026-80903 CVE-2026-80904 CVE-2026-80906 CVE-2026-80907                      CVE-2026-80908 CVE-2026-80909 CVE-2026-80910 CVE-2026-80911                      CVE-2026-80912 CVE-2026-80913 CVE-2026-80915 CVE-2026-80916                      CVE-2026-80917 CVE-2026-80918     Debian Bug     : 1142912 1143545

    Several vulnerabilities have been discovered in the Linux kernel that     may lead to a privilege escalation, denial of service or information     leaks.

    For Debian 12 bookworm, these problems have been fixed in version     6.12.107-1~deb12u1.  This update additionally includes many more bug     fixes from stable updates 6.12.102-6.12.107, and adds drivers for     Alcor card readers.

    We recommend that you upgrade your linux-6.12 packages.

    For the detailed security status of linux-6.12 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/linux-6.12

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6466 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6466-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     August 25, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : linux     CVE ID         : CVE-2025-38525 CVE-2025-40054 CVE-2026-43197 CVE-2026-53092                      CVE-2026-64017 CVE-2026-64586 CVE-2026-68082 CVE-2026-68118                      CVE-2026-68132 CVE-2026-68138 CVE-2026-68159 CVE-2026-68166                      CVE-2026-68169 CVE-2026-68198 CVE-2026-68253 CVE-2026-68254                      CVE-2026-68264 CVE-2026-68266 CVE-2026-68267 CVE-2026-68273                      CVE-2026-68276 CVE-2026-68322 CVE-2026-68367 CVE-2026-68431                      CVE-2026-68451 CVE-2026-68452 CVE-2026-68480 CVE-2026-72111                      CVE-2026-74440 CVE-2026-74441 CVE-2026-74442 CVE-2026-74443                      CVE-2026-74444 CVE-2026-74445 CVE-2026-74446 CVE-2026-74447                      CVE-2026-74448 CVE-2026-74450 CVE-2026-74451 CVE-2026-74452                      CVE-2026-74453 CVE-2026-74454 CVE-2026-74455 CVE-2026-74456                      CVE-2026-74457 CVE-2026-74458 CVE-2026-74459 CVE-2026-74460                      CVE-2026-74461 CVE-2026-74463 CVE-2026-74464 CVE-2026-74465                      CVE-2026-74467 CVE-2026-74468 CVE-2026-74469 CVE-2026-74470                      CVE-2026-74471 CVE-2026-74472 CVE-2026-74473 CVE-2026-74474                      CVE-2026-74475 CVE-2026-74476 CVE-2026-74478 CVE-2026-74479                      CVE-2026-74480 CVE-2026-74481 CVE-2026-74482 CVE-2026-74483                      CVE-2026-74484 CVE-2026-74485 CVE-2026-74487 CVE-2026-74488                      CVE-2026-74490 CVE-2026-74492 CVE-2026-74493 CVE-2026-74494                      CVE-2026-74495 CVE-2026-74497 CVE-2026-74498 CVE-2026-74499                      CVE-2026-74500 CVE-2026-74501 CVE-2026-74502 CVE-2026-74503                      CVE-2026-74504 CVE-2026-74505 CVE-2026-74507 CVE-2026-74508                      CVE-2026-74509 CVE-2026-74510 CVE-2026-74512 CVE-2026-74514                      CVE-2026-74515 CVE-2026-74516 CVE-2026-74517 CVE-2026-74518                      CVE-2026-74519 CVE-2026-74522 CVE-2026-74523 CVE-2026-74524                      CVE-2026-74525 CVE-2026-74531 CVE-2026-74532 CVE-2026-74535                      CVE-2026-74536 CVE-2026-74540 CVE-2026-74541 CVE-2026-74543                      CVE-2026-74545 CVE-2026-74546 CVE-2026-74547 CVE-2026-74548                      CVE-2026-74549 CVE-2026-74550 CVE-2026-74551 CVE-2026-74552                      CVE-2026-74553 CVE-2026-74555 CVE-2026-74556 CVE-2026-74557                      CVE-2026-74563 CVE-2026-74564 CVE-2026-74565 CVE-2026-74566                      CVE-2026-74567 CVE-2026-74569 CVE-2026-74572 CVE-2026-74574                      CVE-2026-74575 CVE-2026-74576 CVE-2026-74577 CVE-2026-74579                      CVE-2026-74580 CVE-2026-74581 CVE-2026-74582 CVE-2026-74583                      CVE-2026-74585 CVE-2026-74586 CVE-2026-74587 CVE-2026-74588                      CVE-2026-74589 CVE-2026-74590 CVE-2026-74592 CVE-2026-74594                      CVE-2026-74595 CVE-2026-74597 CVE-2026-74598 CVE-2026-74599                      CVE-2026-74601 CVE-2026-74602 CVE-2026-74603 CVE-2026-74604                      CVE-2026-74606 CVE-2026-74607 CVE-2026-74608 CVE-2026-74609                      CVE-2026-74610 CVE-2026-74612 CVE-2026-74613 CVE-2026-74614                      CVE-2026-74615 CVE-2026-74616 CVE-2026-74618 CVE-2026-74619                      CVE-2026-74620 CVE-2026-74621 CVE-2026-74622 CVE-2026-74623                      CVE-2026-74624 CVE-2026-74625 CVE-2026-74628 CVE-2026-74630                      CVE-2026-74631 CVE-2026-74632 CVE-2026-74634 CVE-2026-74635                      CVE-2026-74636 CVE-2026-74637 CVE-2026-74641 CVE-2026-74644                      CVE-2026-74646 CVE-2026-74647 CVE-2026-74648 CVE-2026-74649                      CVE-2026-74650 CVE-2026-74651 CVE-2026-74654 CVE-2026-74655                      CVE-2026-74656 CVE-2026-74657 CVE-2026-74658 CVE-2026-74659                      CVE-2026-74660 CVE-2026-74661 CVE-2026-74663 CVE-2026-74664                      CVE-2026-74665 CVE-2026-74666 CVE-2026-74667 CVE-2026-74668                      CVE-2026-74669 CVE-2026-74670 CVE-2026-74671 CVE-2026-74672                      CVE-2026-74673 CVE-2026-74675 CVE-2026-74676 CVE-2026-74677                      CVE-2026-74678 CVE-2026-74679 CVE-2026-74680 CVE-2026-74682                      CVE-2026-74683 CVE-2026-74684 CVE-2026-74685 CVE-2026-74688                      CVE-2026-74689 CVE-2026-74691 CVE-2026-74692 CVE-2026-74693                      CVE-2026-74694 CVE-2026-74696 CVE-2026-74700 CVE-2026-74701                      CVE-2026-74704 CVE-2026-74705 CVE-2026-74710 CVE-2026-74712                      CVE-2026-74714 CVE-2026-74717 CVE-2026-74718 CVE-2026-74719                      CVE-2026-74720 CVE-2026-74722 CVE-2026-74724 CVE-2026-74725                      CVE-2026-74726 CVE-2026-74730 CVE-2026-74732     Debian Bug     : 1142912 1143545

    Several vulnerabilities have been discovered in the Linux kernel that     may lead to a privilege escalation, denial of service or information     leaks.

    For the stable distribution (trixie), these problems have been fixed in     version 6.12.105-1.

    We recommend that you upgrade your linux packages.

    For the detailed security status of linux please refer to its security     tracker page at:
    https://security-tracker.debian.org/tracker/linux

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - tcp: challenge ACK for non-exact RST in SYN-RECEIVED The SYN-RECEIVED request-socket path in     tcp_check_req() accepts an in-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A non-exact     RST therefore removes the request instead of eliciting a challenge ACK. RFC 9293 section 3.10.7.4 applies     the RFC 5961 reset check in SYN-RECEIVED: an exact RST resets the connection, while a non-exact in-window     RST must trigger a challenge ACK and be dropped. Apply that check before the ACK-field validation,     following the RFC sequence-number, RST, then ACK processing order. Factor the per-netns challenge ACK     quota out of tcp_send_challenge_ack() so request sockets can share it. Use the request socket's send_ack()     callback and its own out-of-window ACK timestamp to send and rate-limit the response. (CVE-2026-68118)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
348574	Debian dla-4788 : ata-modules-6.12.100+deb12-armmp-di - security update	Nessus	Debian Local Security Checks	Local	medium
343049	Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-500248)	Nessus	Oracle Linux Local Security Checks	Local	high
341888	Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-2106)	Nessus	Amazon Linux Local Security Checks	Local	high
339550	Debian dsa-6466 : ata-modules-6.12.101+deb13-armmp-di - security update	Nessus	Debian Local Security Checks	Local	medium
334202	Linux Distros Unpatched Vulnerability : CVE-2026-68118	Nessus	Misc.	Local	high

Detections

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CVE-2026-68118

high

Tenable Plugins

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high

high

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high