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 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 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 – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: bpf, verifier: Fixed a memory leak in array reallocation for stack state. If an error NULL is returned by krealloc, callers of reallocarray would set their allocation pointers to NULL. However, when an error occurs in krealloc, i...

Astra Linux – Vulnerability in Linux, Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: BPF: Added an oversize check before calling kvcalloc Commit 7661809d493b “mm: does not allow oversized kvmalloc calls” added the oversize check. When the allocation is larger than what kmalloc can handle, the following warning is...

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 found in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: BPF: Do not use tnumrange for array range checking when dealing with poke descriptors. Hsin-Wei reported a KASAN issue triggered by their BPF runtime fuzzer, which is based on a custom syzkaller: - BUG: KASAN: Out-of-bounds...

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 – Vulnerabilities in Linux 5.10, Linux 5.15, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: bpf: Deferring the release of the inner map when necessary When updating or deleting an inner map in the map array or map htab, the map may still be accessed by non-sleepable programs or sleepable programs. However, when the...

Astra Linux – Vulnerability found in Linux 5.15, Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fixed repeated calls to sockput when msg has moredata In the tcpbpfsendverdict redirection, the eval variable is assigned to SKREDIRECT after the applybytes data is sent. If msg has moredata, sockput will be called...

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...

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 found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: bpf, cpumap: Ensure that the kthread is running before the map update returns. The following warning was reported when running stress-mode enabled xdpredirectcpu with some RT threads: ---------- Cut here ------------ WARNING: CPU...

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 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, Linux 5.10

A flaw was discovered in the s390 eBPF JIT mechanism within bpfjitinsn in the arch/s390/net/bpfjitcomp.c file of the Linux kernel. In this flaw, a local attacker with special user privileges can bypass the verifier, potentially leading to confidentiality issues...

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 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 – 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...