xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel XkbNumKbdGroups but CheckKeyTypes does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift...

Important: Red Hat Security Advisory: tigervnc security update

An update for tigervnc is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from...

postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory

A flaw was found in PostgreSQL libpq. A server superuser can exploit a buffer overflow vulnerability in the PQfn function, which is used by client functions such as loexport, loread, lolseek64, and lotell64. This allows the superuser to send an arbitrarily large response, overwriting the client's...

postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory

A flaw was found in PostgreSQL libpq. A server superuser can exploit a buffer overflow vulnerability in the PQfn function, which is used by client functions such as loexport, loread, lolseek64, and lotell64. This allows the superuser to send an arbitrarily large response, overwriting the client's...

EUVD-2026-39184

NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes...

CVE-2026-53267

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftct: bail out on template ct in get eval I noticed this issue while looking at a historic syzbot report 1. A rule like the one below is enough to trigger the bug: table ip t chain pre type filter hook prerouting...

CVE-2026-53263

In the Linux kernel, the following vulnerability has been resolved: 6lowpan: fix off-by-one in multicast context address compression The second memcpy in lowpaniphcmcastctxaddrcompress uses &data1 as destination and &ipaddr-s6addr11 as source, but both should be offset by one: &data2 and...

CVE-2026-53241

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: dummy: fix UMP event stack overread The dummy sequencer port forwards events by copying an incoming struct sndseqevent into a stack temporary, rewriting source and destination, and dispatching the temporary to...

CVE-2026-53211

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftmetabridge: fix stale stack leak via IIFHWADDR register NFTMETABRIIIFHWADDR declares its destination register with len = ETHALEN 6 bytes, which the register-init tracking rounds up to two 32-bit registers 8 bytes...

CVE-2026-53134

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftfib: fix stale stack leak via the OIFNAME register For NFTFIBRESULTOIFNAME the destination register is declared with len = IFNAMSIZ four 32-bit registers, but on the lookup-fail, RTNLOCAL and oif-mismatch paths...

UBUNTU-CVE-2026-53243

In the Linux kernel, the following vulnerability has been resolved: rseq: Fix using an uninitialized stack variable in rseqexituserupdate There is an bug in which an uninitialized stack variable is used in rseqexituserupdate as reported by syzbot: BUG: KMSAN: kernel-infoleak in rseqsetidsgetcsadd...

UBUNTU-CVE-2026-53267

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftct: bail out on template ct in get eval I noticed this issue while looking at a historic syzbot report 1. A rule like the one below is enough to trigger the bug: table ip t chain pre type filter hook prerouting...

CVE-2026-53183

In the Linux kernel, the following vulnerability has been resolved: mptcp: allow subflow rcv wnd to shrink In MPTCP connection, the window field in the TCP header refers to the MPTCP-level rcvnxt and it's right edge should not move backward. Such constraint is enforced at DSS option generation...

CVE-2026-53241

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: dummy: fix UMP event stack overread The dummy sequencer port forwards events by copying an incoming struct sndseqevent into a stack temporary, rewriting source and destination, and dispatching the temporary to...

CVE-2026-53211

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftmetabridge: fix stale stack leak via IIFHWADDR register NFTMETABRIIIFHWADDR declares its destination register with len = ETHALEN 6 bytes, which the register-init tracking rounds up to two 32-bit registers 8 bytes...

CVE-2026-53267

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftct: bail out on template ct in get eval I noticed this issue while looking at a historic syzbot report 1. A rule like the one below is enough to trigger the bug: table ip t chain pre type filter hook prerouting...

CVE-2026-53134

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftfib: fix stale stack leak via the OIFNAME register For NFTFIBRESULTOIFNAME the destination register is declared with len = IFNAMSIZ four 32-bit registers, but on the lookup-fail, RTNLOCAL and oif-mismatch paths...

UBUNTU-CVE-2026-53211

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftmetabridge: fix stale stack leak via IIFHWADDR register NFTMETABRIIIFHWADDR declares its destination register with len = ETHALEN 6 bytes, which the register-init tracking rounds up to two 32-bit registers 8 bytes...

UBUNTU-CVE-2026-53134

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftfib: fix stale stack leak via the OIFNAME register For NFTFIBRESULTOIFNAME the destination register is declared with len = IFNAMSIZ four 32-bit registers, but on the lookup-fail, RTNLOCAL and oif-mismatch paths...

CVE-2026-53263 6lowpan: fix off-by-one in multicast context address compression

In the Linux kernel, the following vulnerability has been resolved: 6lowpan: fix off-by-one in multicast context address compression The second memcpy in lowpaniphcmcastctxaddrcompress uses &data1 as destination and &ipaddr-s6addr11 as source, but both should be offset by one: &data2 and...