In the Linux kernel, the following vulnerability has been resolved: xfrm: input: hold netns during deferred transport reinjection Transport-mode reinjection stores a struct net pointer in skb->cb and uses it later from xfrm_trans_reinject(). That pointer must stay valid until the deferred callback runs. Take a netns reference when queueing deferred reinjection work and drop it after the callback completes. Use maybe_get_net() so the queueing path does not revive a namespace that is already being torn down. This keeps the existing workqueue design and fixes the netns lifetime handling in one place for all users of xfrm_trans_queue_net().

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3593-1 advisory.

    The SUSE Linux Enterprise 15 SP4 kernel was updated to fix various security issues:

    The following security issues were fixed:

    - CVE-2022-4994: KVM: x86: wean fast IN from emulator_pio_in (bsc#1273097).
    - CVE-2023-53995: net: ipv4: fix one memleak in __inet_del_ifa() (bsc#1255616).
    - CVE-2026-46052: ceph: only d_add() negative dentries when they are unhashed (bsc#1267494).
    - CVE-2026-46056: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers (bsc#1267435).
    - CVE-2026-46145: RDMA/mana: Validate rx_hash_key_len (bsc#1267715).
    - CVE-2026-46193: xfrm: ah: account for ESN high bits in async callbacks (bsc#1267656).
    - CVE-2026-52956: libceph: Fix potential out-of-bounds access in __ceph_x_decrypt() (bsc#1269172).
    - CVE-2026-52958: libceph: Fix potential out-of-bounds access in osdmap_decode() (bsc#1269174).
    - CVE-2026-52967: smb/client: fix possible infinite loop and oob read in symlink_data() (bsc#1269181).
    - CVE-2026-52986: netfilter: nf_conntrack_sip: don't use simple_strtoul (bsc#1269289).
    - CVE-2026-53050: quota: Fix race of dquot_scan_active() with quota deactivation (bsc#1269188).
    - CVE-2026-53131: netfilter: require Ethernet MAC header before using eth_hdr() (bsc#1269773).
    - CVE-2026-53196: USB: serial: io_ti: fix heap overflow in get_manuf_info() (bsc#1269986).
    - CVE-2026-53224: sctp: validate embedded INIT chunk and address list lengths in cookie (bsc#1269997).
    - CVE-2026-53246: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing (bsc#1269988).
    - CVE-2026-53256: Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind() (bsc#1269993).
    - CVE-2026-53260: preempt: Provide preempt_[dis|en]able_nested() (bsc#1269731).
    - CVE-2026-53267: netfilter: nft_ct: bail out on template ct in get eval (bsc#1269577).
    - CVE-2026-53354: arm64: errata: Mitigate TLBI errata on various Arm CPUs (bsc#1270230).
    - CVE-2026-53357: Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del() (bsc#1270257).
    - CVE-2026-53375: drm/amdgpu/vce: Prevent partial address patches (bsc#1271899).
    - CVE-2026-53388: fuse: re-lock request before replacing page cache folio (bsc#1271825).
    - CVE-2026-53391: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr (bsc#1271904).
    - CVE-2026-53402: fbdev: fbcon: fix out-of-bounds read in err_out of (bsc#1271908).
    - CVE-2026-63794: KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path (bsc#1271964).
    - CVE-2026-63806: KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()     (bsc#1272268).
    - CVE-2026-63807: KVM: x86/mmu: Ensure hugepage is in by slot before checking max mapping level     (bsc#1272263).
    - CVE-2026-63824: KEYS: fix overflow in keyctl_pkey_params_get_2() (bsc#1272180).
    - CVE-2026-63829: net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink (bsc#1272176).
    - CVE-2026-63893: thunderbolt: property: Reject u32 wrap in tb_property_entry_valid() (bsc#1272607).
    - CVE-2026-63917: ip6: vti: Use ip6_tnl.net in vti6_changelink() (bsc#1272904).
    - CVE-2026-63919: xfrm: input: hold netns during deferred transport reinjection (bsc#1272907).
    - CVE-2026-63921: ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate() (bsc#1272918).
    - CVE-2026-63922,CVE-2026-63924: ipv6: exthdrs: recompute network header pointer once (bsc#1272855).
    - CVE-2026-63971: sctp: fix race between sctp_wait_for_connect and peeloff (bsc#1272678).
    - CVE-2026-63975: Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp (bsc#1272694).
    - CVE-2026-63984: ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress() (bsc#1272865).
    - CVE-2026-63994: tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp()     (bsc#1273035).
    - CVE-2026-64106: KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits     (bsc#1272242).
    - CVE-2026-64189: netfilter: ipset: fix race between dump and ip_set_list resize (bsc#1272207).
    - CVE-2026-64561: KVM: x86: Check for invalid/obsolete root *after* making MMU pages available     (bsc#1273231).
    - CVE-2026-64560: posix-cpu-timers: Prevent UAF caused by non-leader exec() race (bsc#1273004).
    - CVE-2026-64564: sctp: don't free the ASCONF's own transport in DEL-IP processing (bsc#1274072).
    - CVE-2026-64600: xfs: resample the data fork mapping after cycling ILOCK (bsc#1271526).

    The following non security issues were fixed:

    - hrtimers: Introduce hrtimer_setup() to replace hrtimer_init() (bsc#1271912).
    - mkspec-dtb: Skip missing DTBs.
    - pkspec-dtb: Fix dtb-al rename.
    - posix-cpu-timers: Cleanup the firing logic (bsc#1271912).
    - posix-cpu-timers: Correctly update timer status in posix_cpu_timer_del() (bsc#1271912).
    - posix-cpu-timers: Do not arm SIGEV_NONE timers (bsc#1271912).
    - posix-cpu-timers: Handle interval timers correctly in timer_get() (bsc#1271912).
    - posix-cpu-timers: Handle SIGEV_NONE timers correctly in timer_get() (bsc#1271912).
    - posix-cpu-timers: Handle SIGEV_NONE timers correctly in timer_set() (bsc#1271912).
    - posix-cpu-timers: Make k_itimer::it_active consistent (bsc#1271912).
    - posix-cpu-timers: Remove incorrect comment in posix_cpu_timer_set() (bsc#1271912).
    - posix-cpu-timers: Replace old expiry retrieval in posix_cpu_timer_set() (bsc#1271912).
    - posix-cpu-timers: Simplify posix_cpu_timer_set() (bsc#1271912).
    - posix-cpu-timers: Split up posix_cpu_timer_get() (bsc#1271912).
    - posix-cpu-timers: Use @now instead of @val for clarity (bsc#1271912).
    - posix-timers: Add proper state tracking (bsc#1271912).
    - posix-timers: Avoid direct access to hrtimer clockbase (bsc#1271912).
    - posix-timers: Clarify posix_timer_fn() comments (bsc#1271912).
    - posix-timers: Clear overrun in common_timer_set() (bsc#1271912).
    - posix-timers: Consolidate signal queueing (bsc#1271912).
    - posix-timers: Consolidate timer setup (bsc#1271912).
    - posix-timers: Cure si_sys_private race (bsc#1271912).
    - posix-timers: Document common_clock_get() correctly (bsc#1271912).
    - posix-timers: Expand timer_arm() callbacks with a boolean return value (bsc#1271912).
    - posix-timers: Polish coding style in a few places (bsc#1271912).
    - posix-timers: Retrieve interval in common timer_settime() code (bsc#1271912).
    - sctp: validate embedded address parameter length (git-fixes).
    - time: Switch to hrtimer_setup() (bsc#1271912).

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

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

An update of the linux package has been released.

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

  - xfrm: input: hold netns during deferred transport reinjection Transport-mode reinjection stores a struct     net pointer in skb->cb and uses it later from xfrm_trans_reinject(). That pointer must stay valid until     the deferred callback runs. Take a netns reference when queueing deferred reinjection work and drop it     after the callback completes. Use maybe_get_net() so the queueing path does not revive a namespace that is     already being torn down. This keeps the existing workqueue design and fixes the netns lifetime handling in     one place for all users of xfrm_trans_queue_net(). (CVE-2026-63919)

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

ID	Name	Product	Family	Type	Severity
335101	SUSE SLES15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:3595-1)	Nessus	SuSE Local Security Checks	Local	high
335098	SUSE SLES15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:3593-1)	Nessus	SuSE Local Security Checks	Local	high
335080	openSUSE 16: cluster-md-kmp-64kb / cluster-md-kmp-azure / cluster-md-kmp-default / etc (openSUSE-SU-2026:21555-1)	Nessus	SuSE Local Security Checks	Local	high
333941	Photon OS 5.0: Linux PHSA-2026-5.0-92-0926	Nessus	PhotonOS Local Security Checks	Local	high
333762	Photon OS 5.0: Linux PHSA-2026-5.0-92-0895	Nessus	PhotonOS Local Security Checks	Local	high
329326	Photon OS 5.0: Linux PHSA-2026-5.0-0926	Nessus	PhotonOS Local Security Checks	Local	high
328499	Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2026-110 (ALASKERNEL-5.15-2026-110)	Nessus	Amazon Linux Local Security Checks	Local	medium
328493	Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1968)	Nessus	Amazon Linux Local Security Checks	Local	high
328071	Linux Distros Unpatched Vulnerability : CVE-2026-63919	Nessus	Misc.	Local	high
327380	Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2026-1924)	Nessus	Amazon Linux Local Security Checks	Local	medium
325574	Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2026-124 (ALASKERNEL-5.10-2026-124)	Nessus	Amazon Linux Local Security Checks	Local	high
322944	Photon OS 5.0: Linux PHSA-2026-5.0-0895	Nessus	PhotonOS Local Security Checks	Local	high
322087	Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1881)	Nessus	Amazon Linux Local Security Checks	Local	high

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