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Red Hat Security Advisory

RHSA-2026:21557

kernel security update

Released 2026-05-28 · Red Hat rating Important · View on Red Hat →

Fixed in

Fixes 18 records

Priority MEDIUM 48

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() In DecodeQ931(), the UserUserIE code path reads a 16-bit length from the packet, the…

CVSS 3.1CRITICAL 9.1 Network No auth No interaction EPSS 0.01587 Published 2026-04-03 Partial fix · 5.10.253, 5.15.203 +6 CWE-125
Priority MEDIUM 47

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_eui64: reject invalid MAC header for all packets `eui64_mt6()` derives a modified EUI-64 from the Ethernet source address and compares i…

CVSS 3.1CRITICAL 9.4 Network No auth No interaction EPSS 0.00485 Published 2026-04-25 Partial fix · 5.10.258, 5.15.209 +6 CWE-125
Priority MEDIUM 43

In the Linux kernel, the following vulnerability has been resolved: can: j1939: j1939_session_new(): fix skb reference counting Since j1939_session_skb_queue() does an extra skb_get() for each new skb, do the same for th…

CVSS 3.1CRITICAL 9.8 Network No auth No interaction EPSS 0.00681 Published 2024-12-27 Partial fix · 5.4.287, 5.10.231 +5
Priority MEDIUM 42

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_tcpmss: check remaining length before reading optlen Quoting reporter: In net/netfilter/xt_tcpmss.c (lines 53-68), the TCP option parser r…

CVSS 3.1HIGH 8.2 Network No auth No interaction EPSS 0.00463 Published 2026-05-06 Partial fix · 5.10.252, 5.15.202 +6 CWE-125
Priority MEDIUM 40

In the Linux kernel, the following vulnerability has been resolved: xfs: fix freemap adjustments when adding xattrs to leaf blocks xfs/592 and xfs/794 both trip this assertion in the leaf block freemap adjustment code af…

CVSS 3.1HIGH 8.8 Network Low privileges No interaction EPSS 0.00469 Published 2026-05-06 Partial fix · 5.10.252, 5.15.202 +6 CWE-664
Priority MEDIUM 40

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: validate bsscfg indices in IF events brcmf_fweh_handle_if_event() validates the firmware-provided interface index before it touches drvr…

CVSS 3.1HIGH 8.8 Adjacent network No auth No interaction EPSS 0.0027 Published 2026-05-06 Partial fix · 5.10.258, 5.15.209 +6 CWE-129
Priority LOW 35

In the Linux kernel, the following vulnerability has been resolved: mm/page_alloc: clear page->private in free_pages_prepare() Several subsystems (slub, shmem, ttm, etc.) use page->private but don't clear it before freei…

CVSS 3.1HIGH 7.8 Local Low privileges No interaction EPSS 0.00172 Published 2026-05-08 Partial fix · 6.1.176, 6.6.143 +4 CWE-457
Priority LOW 35

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: ensure safe access to master conntrack Holding reference on the expectation is not sufficient, the master conntrack object can jus…

CVSS 3.1HIGH 7.8 Local Low privileges No interaction EPSS 0.00101 Published 2026-05-06 Partial fix · 6.1.176, 6.6.143 +4 CWE-362
Priority LOW 35

In the Linux kernel, the following vulnerability has been resolved: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq The wacom_intuos_bt_irq() function processes Bluetooth HID reports without sufficient bounds c…

CVSS 3.1HIGH 8.1 Adjacent network No auth No interaction EPSS 0.00256 Published 2026-05-01 Partial fix · 5.10.253, 5.15.203 +6 CWE-125
Priority LOW 35

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: fix race conditions in sco_sock_connect() sco_sock_connect() checks sk_state and sk_type without holding the socket lock.

CVSS 3.1HIGH 7.8 Local Low privileges No interaction EPSS 0.00097 Published 2026-05-01 Fixed in 6.1.168, 6.6.134 +4 CWE-362
Priority LOW 35

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a ho…

CVSS 3.1HIGH 7.8 Local Low privileges No interaction EPSS 0.00165 Published 2026-03-25 Partial fix · 5.10.273, 5.15.224 +6 CWE-416
Priority LOW 35

In the Linux kernel, the following vulnerability has been resolved: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr Currently when both IMA and EVM are in fix mode, the IMA signature will be reset…

CVSS 3.1HIGH 7.8 Local Low privileges No interaction EPSS 0.00154 Published 2025-12-16 Partial fix · 6.1.191, 6.6.117 +3
Priority LOW 33

In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: validate num_ifs to prevent out-of-bounds write The driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes() but never valid…

CVSS 3.1HIGH 7.8 Local Low privileges No interaction EPSS 0.00139 Published 2026-05-06 Fixed in 5.15.202, 6.1.165 +5 CWE-787
Priority LOW 33

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_helper: pass helper to expect cleanup nf_conntrack_helper_unregister() calls nf_ct_expect_iterate_destroy() to remove expectatio…

CVSS 3.1HIGH 7.8 Local Low privileges No interaction EPSS 0.00131 Published 2026-05-01 Partial fix · 5.10.253, 5.15.203 +6 CWE-416
Priority LOW 33

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate LTK enc_size on load Load Long Term Keys stores the user-provided enc_size and later uses it to size fixed-size stack operatio…

CVSS 3.1HIGH 7.8 Local Low privileges No interaction EPSS 0.00129 Published 2026-05-01 Partial fix · 5.10.253, 5.15.203 +6 CWE-787
Priority LOW 30

In the Linux kernel, the following vulnerability has been resolved: io_uring/rsrc: reject zero-length fixed buffer import validate_fixed_range() admits buf_addr at the exact end of the registered region when len is zero,…

CVSS 3.1HIGH 7.1 Local Low privileges No interaction EPSS 0.00124 Published 2026-05-01 Fixed in 6.18.22, 6.19.12 +1 CWE-125
Priority LOW 24

In the Linux kernel, the following vulnerability has been resolved: net: sched: act_csum: validate nested VLAN headers tcf_csum_act() walks nested VLAN headers directly from skb->data when an skb still carries in-payload…

CVSS 3.1MEDIUM 5.5 Local Low privileges No interaction EPSS 0.00117 Published 2026-04-25 Partial fix · 4.20, 5.10.258 +7
Priority LOW 24

In the Linux kernel, the following vulnerability has been resolved: mm: thp: deny THP for files on anonymous inodes file_thp_enabled() incorrectly allows THP for files on anonymous inodes (e.g.

CVSS 3.1MEDIUM 5.5 Local Low privileges No interaction EPSS 0.00123 Published 2026-03-25 Fixed in 6.12.78, 6.18.17 +2 CWE-617