CVE-2026-97614
UnknownSummary
In the Linux kernel's DSA tagger for Broadcom (tag_brcm), there is an issue with FCS calculation for nonlinear frames. The tagger does not declare the required tailroom, causing an out-of-bounds read (slab-out-of-bounds) during CRC calculation. The fix declares the required tailroom, which disables SG and FRAGLIST features and linearizes frames before processing.
Risk Assessment
The vulnerability could lead to out-of-bounds memory read, potentially resulting in information disclosure, system crash, or privilege escalation.
Recommendation
Apply the kernel patch that declares the required tailroom and update the system to a kernel version containing this fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: dsa: tag_brcm: legacy FCS: request needed tailroom The legacy FCS tagger calculates the CRC over skb->len bytes starting at skb->data. When a nonlinear skb reaches the tagger, this reads past the linear head into unrelated slab memory. The tagger appends an Ethernet FCS but does not declare that tailroom. As a result, DSA leaves NETIF_F_SG and NETIF_F_FRAGLIST enabled on the user port, and nonlinear skbs can reach the CRC calculation. Declare the required tailroom. DSA will then clear those features and the networking core will linearize skbs before the tagger runs. A KASAN-enabled dsa_loop test using this tagger reports: BUG: KASAN: slab-out-of-bounds in crc32_le Read of size 1 at addr ffff8880397086c0 by task exp/135 Call Trace: crc32_le (lib/crc/crc32-main.c:38) brcm_leg_fcs_tag_xmit (net/dsa/tag_brcm.c:343) dsa_user_xmit (net/dsa/user.c:942) dev_hard_start_xmit (net/core/dev.c:3937) __dev_queue_xmit (net/core/dev.c:4926) packet_sendmsg (net/packet/af_packet.c:3110) __sys_sendto (net/socket.c:2281) The buggy address belongs to the object at ffff888039708400 which belongs to the cache skbuff_small_head of size 704 The buggy address is located 0 bytes to the right of allocated 704-byte region [ffff888039708400, ffff8880397086c0)
Vulnerability data from NVD (NIST) · CISA KEV · EPSS