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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-53078

bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops When a BPF sock_ops program accesses ctx fields with dst_reg == src_reg, the SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the destination register in the !fullsock / !locked_tcp_sock path. Both macros borrow a temporary register to check is_fullsock / is_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the ctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with a request_sock), dst_reg should be zeroed but is not, leaving the stale ctx pointer: - SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer, leading to stack-out-of-bounds access in helpers like bpf_skc_to_tcp6_sock(). - SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the verifier believes is a SCALAR_VALUE, leaking a kernel pointer. Fix both macros by: - Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the added instruction. - Adding BPF_MOV64_IMM(si->dst_reg, 0) after the temp register restore in the !fullsock path, placed after the restore because dst_reg == src_reg means we need src_reg intact to read ctx->temp.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • fd09af010788a884de1c39537c288830c3d305db to < db1200ec2c3ddf119d4d9ba67982063df06bbacbaffected
  • fd09af010788a884de1c39537c288830c3d305db to < 4c1c5efd9d1d74743d41ce4e1600501b4feb6827affected
  • fd09af010788a884de1c39537c288830c3d305db to < 0e6b30657bbc771f38025c828d722b6162428508affected
  • fd09af010788a884de1c39537c288830c3d305db to < 64eaf4ecda007140ddcdb28e00c48c9c69aaba39affected
  • fd09af010788a884de1c39537c288830c3d305db to < 2a2c98141e0a75f2d4a7d78b0316c88b3da784acaffected
  • fd09af010788a884de1c39537c288830c3d305db to < 22400725de070b787cd6d806c5795370ab46d269affected
  • fd09af010788a884de1c39537c288830c3d305db to < 18e3ffde1822f0b48b1753bf34aa97ce839df1d8affected
  • fd09af010788a884de1c39537c288830c3d305db to < 10f86a2a5c91fc4c4d001960f1c21abe52545ef6affected
  • 48be3df15aa19c04eadf156c9129293c9a10389faffected
  • cd4644d904e1d153d516e73e2e127e7a2fe687e1affected
  • 6e0bc946cbeec538322820786b5fb5200a2216abaffected
  • a7e52f7f675046d9ffc5692d815fa67c82fcdbf5affected
  • db7f8c57dbdd31f7e59f8dc8d1e1b38607a320efaffected
  • 5.7.18 to < 5.8affected
  • 5.8.4 to < 5.9affected
  • 5.4.61 to < 5.5affected

Linux Linux

Default version status: affected

  • 5.9affected
  • 0 to < 5.9unaffected
  • 5.10.270 to ≤ 5.10.*unaffected
  • 5.15.221 to ≤ 5.15.*unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.101 to ≤ 6.12.*unaffected
  • 6.18.42 to ≤ 6.18.*unaffected
  • 7.0.10 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References