Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: nvme-multipath: fix underflow in ANA log bounds checks The number of ANA groups advertised through Identify Controller sizes the ANA log buffer. The ANA log header and group descriptors independently supply the number of groups and namespace IDs to parse. Both bounds checks subtract an untrusted object size from ana_log_size before comparing the current offset. If the object is larger than the buffer, the size_t subtraction underflows and lets the parser read beyond ana_log_buf. Check the current offset before the first subtraction and compare each object size with the remaining buffer instead. This rejects inconsistent ANA data before dereferencing a truncated group descriptor or walking an oversized namespace ID array.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund18 Oct 2026WID-SEC-2026-4019

  Linux Kernel: Multiple vulnerabilities Translated from German

  CVE-2026-98866CVE-2026-98624CVE-2026-98745+326 more CVEs

[ References ]References

• git.kernel.org/stable/c/03a0c21f0fd7a872953aae5714303d8f38d1e567
• git.kernel.org/stable/c/3045128294d347fd38542ad6e174b1b34d9c0751
• git.kernel.org/stable/c/49e8a3224c91fd5fbf22f4adcca6c8209cfdd6fe
• git.kernel.org/stable/c/63fa2d9c9c37020bd2703fe2a6a38027b5abeb15
• git.kernel.org/stable/c/e5cdb0c0a51e8ff49914ae16ef5360010c40cc85