Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: ipv6: Avoid overflows in ip6datagramsendctl Yiming Qian reported: I believe I have found a locally triggerable kernel bug in the IPv6 sendmsg auxiliary-data path that can cause the kernel to panic via skbunderpanic local DoS...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, Linux, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: iscsistart: A UBSAN out-of-bounds warning has been fixed in ibftattrshownic. When performing an iSCSI boot using IPv6, iscsistart still reads the /sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix length is 64,...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: Net: Fixing segmentation issues with forwarding fraglists for GRO packets. This patch improves the handling of GSO segmentation by properly checking the SKBGSODODGY flag for GSO packets with a fraglist. This addresses low...

Astra Linux – Vulnerabilities in Linux, Linux-5.10, Linux-5.15, Linux-6.1

In the Linux kernel, the following vulnerabilities have been resolved: netfilter: nftct: sanitize layer 3 and 4 protocol numbers in custom expectations - Disallow families other than NFPROTOIPV4,IPV6,INET. - Disallow layer 4 protocols without ports, as the destination port is a mandatory attribut...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: ipv6: Use RCU in ip6xmit The use of RCU in ip6xmit is necessary in order to use dstdevrcu and prevent possible UAF Use-After-Free vulnerabilities...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: ipv6: Fixed a NULL pointer dereference in ip6rtgetdevrcu. l3mdevmasterdevrcu can return NULL when the slave device is being un-slaved from a VRF. All other callers handle this issue, but we lost the fallback to loopback in...

Astra Linux – Vulnerability in Linux 5.10

A flaw was discovered in the IPv6 module of the Linux kernel. The arg.result parameter was not used consistently in fib6rulelookup; sometimes rt6info was used, and other times fib6info. This issue was not accounted for in other parts of the code, where rt6info was expected to be used...

Astra Linux – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: ipv6/sit: Use DEVSTATSINC to avoid data races. syzbot/KCSAN reported that multiple CPUs are updating dev-stats.txerror concurrently. This occurs because sit tunnels use NETIFFLLTX, which means their ndostartxmit function is not...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown The ip6flseqshow function iterates through the global flowlabel hash under the seq-file. It uses a RCU read-side lock and prints fl-opt-optnflen whenever an...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, Linux, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: - In net: The variable sk-skfamily was read once in the function skmcloop. - syzbot is frequently using IPV6ADDRFORM; it managed to trigger the WARNONONCE1 function in skmcloop. We still have many more similar issues that need...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, Linux, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix race condition between ipv6getifaddr and ipv6deladdr Although ipv6getifaddr walks inet6addrlst under the RCU lock, it still means hlistforeachentryrcu can return an item that got removed from the list. The memory itself...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: ipv6: avoided use-after-free in ip6fragment The blamed commit claimed that rcureadlock was held by the callers of ip6fragment. It seems not to always be true, at least for the UDP stack. syzbot reported: BUG: KASAN:...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fixed an issue of signed integer overflow in l2tpip6sendmsg. When len = INTMAX - transhdrlen, the value of ulen = len + transhdrlen will cause an overflow. To address this issue, we can follow the approach used by udpv6 and...

Astra Linux – Vulnerability in Linux, Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix memory leak in fib6rulesuppress The kernel causes a memory leak when a fib rule is present in IPv6 nftables firewall rules, and a suppressprefix rule is present in IPv6 routing rules used by certain tools such as...

Astra Linux – Vulnerability found in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: ipv6: Fixed signed integer overflow in ip6appenddata. Resolved UBSAN overflow checks; this warning is also resolved. The variable length was changed to sizet to fix the issue. UBSAN: Signed-integer overflow in...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: A strict check is performed for the maximum number of actions allowed. The maximum number of hardware-offload actions for flowtable in IPv6 is as follows: - Ethernet mangling: 4 payload actions; 2 actions pe...

Astra Linux – Vulnerabilities in Linux, Linux-5.10, Linux-5.15, Linux-6.1

In the Linux kernel, the following vulnerability has been resolved: inetrecverror is called without holding the socket lock. The IPv6 socket could mutate to an IPv4 socket due to the IPV6ADDRFORM socket option, potentially triggering a KCSAN warning...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15

A vulnerability has been discovered in the Linux kernel. It has been identified as a problem. The component affected by this vulnerability is the “ipv6renewoptions” function within the IPv6 handler. This vulnerability causes a memory leak. The attack can be launched remotely. It is recommended th...

Astra Linux – Vulnerability in Linux 5.10, Linux

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: Ensure that we call ipv6mcdown at most once. There are two reasons why addrconfnotify is called with NETDEVDOWN: Either the network device is actually going down, or IPv6 was disabled on the interface. If either of the...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: The issue related to “slab-use-after-free” in inetlookupestablished has been fixed. The lookups in the ehash table are performed without locking, and they rely on SLABTYPESAFEBYRCU to ensure the stability of socket memory...