Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: bpf, testrun: Fixed an alignment issue in bpfprogtestrunskb. We encountered a syzkaller issue due to an alignment fault for aarch64 architectures when KFENCE is enabled. When the size provided by the user’s bpf program is an o...

Astra Linux – Vulnerability in libbpf

The vulnerability in the src/libbpf.c component of the BPF loader library in Libbpf is related to pointer dereferencing errors. Exploiting this vulnerability allows an attacker to cause a service failure...

Astra Linux – Vulnerability found in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: bpf, cgroup: Fixed a kernel bug in purgeeffectiveprogs Syzkaller reported a triggered kernel bug as follows: ------------ Cut here ----------- Kernel bug at kernel/bpf/cgroup.c:925! Invalid opcode: 0000 1 PREEMPT SMP NOPTI CPU...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: bpf: Disabling preemption in bpfperfeventoutput The nesting protection in bpfperfeventoutput relies on disabled preemption, which is guaranteed for kprobes and tracepoints. However, bpfperfeventoutput can also be called from the...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: BPF: Added schedule points in batch operations. SYZbot reported various soft lockups caused by BPF batch operations. INFO: Task kworker/1:1:27 was blocked for more than 140 seconds. INFO: Task hung during the rcubarrier...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: bpf: Added bpfprogrundatapointers syzbot found that clsbpfclassify can change tcskbcbskb-dropreason, triggering a warning in skskbreasonDrop. WARNING: CPU: 0, PID: 5965, at net/core/skbuff.c:1192 skskbreasonDrop,...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: bpf: Fix tailcallreachable rejection for interpreter when jit failed During testing of f263a81451c1 “bpf: Track subprog poke descriptors correctly and fix use-after-free” under various failure conditions, for example, when...

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

In the Linux kernel, the following vulnerability has been resolved: bpf: Check rcureadlockTraceheld before calling bpf map helpers These three bpfmaplookup,update,deleteelem helpers are also available for sleepable bpf programs. Therefore, add the corresponding lock assertion for sleepable bpf...

Astra Linux – Vulnerability in Linux

A issue was discovered in the Linux kernel through version 5.11.x. The kernel/bpf/verifier.c file contains unwanted out-of-bounds speculation during pointer arithmetic operations, which allows for side-channel attacks that circumvent Spectre mitigations and extract sensitive information from kern...

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: bpf: The reuseport cBPF prog is freed after the RCU grace period. Eulgyu Kim reported the issue below with a reproduction example. The reproduction example sets up a UDP reuseport group with a cBPF prog and replaces it with a new...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: bpf,perf: Fixed an invalid progarray access in perfeventdetachbpfprog Syzbot reported a crash that occurs in the following tracing scenario: - Create a tracepoint with attr.inherit=1, attach it to the process, and set the BPF...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: bpf, sockmap: Fixed a memory leak in tcpbpfsendmsg when skmsg is full. If tcpbpfsendmsg is running while skmsg is full, and skmsgalloc returns an -ENOMEM error, tcpbpfsendmsg will enter a waitformemory state. If part of the...

Astra Linux – Vulnerability in Linux

The bpf verifier in the Linux kernel failed to properly handle truncation of the mod32 destination register when the source register was known to be 0. A local attacker who had the ability to load bpf programs could exploit this vulnerability by performing out-of-bounds reads in kernel memory,...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: xdp, net: Fix use-after-free in bpfxdplinkrelease The problem occurs between devgetbyindex and devxdpattachlink. At this point, devxdpuninstall is called. Then xdp link will not be detached automatically when dev is released. But...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: bpf: Cancel special fields on map value recycle Map update and delete operations currently call bpfobjfreefields when a value is being replaced or recycled. This means that the destruction of special fields depends on the context...

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

In the Linux kernel, the following vulnerability has been resolved: BPF: Avoid using an uninitialized value in BPFCOREREADBITFIELD Changes from V1: - A default branch is added to the switch statement to initialize val. GCC warns that val may be used uninitialized in the BPFCREREADBITFIELD macro,...

Astra Linux – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: bpf: Fixed reference state management for synchronous callbacks Currently, the verifier verifies callback functions both synchronous and asynchronous as if they would be executed only once. The next instruction to be explored ...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix helper functions that write to read-only maps Lonial identified an issue where, even when the BPF map on both the user and BPF sides is frozen like in the case of .rodata, it was still possible to write into it from the...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: BPF: Properly handles malformed BPFCORETYPEIDLOCAL relocation records. In the case of malformed relocation records of the BPFCORETYPEIDLOCAL type that reference a non-existent BTF type, the function bpfcorecalcreloinsn may cause ...

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

In the Linux kernel, the following vulnerability has been resolved: BPF: Fixed a segmentation issue when upgrading gsosize. Linearized the skb when upgrading gsosize, as this may trigger a BUGON later on, as described in 1,2...