{"id":"CVE-2025-38279","summary":"bpf: Do not include stack ptr register in precision backtracking bookkeeping","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Do not include stack ptr register in precision backtracking bookkeeping\n\nYi Lai reported an issue ([1]) where the following warning appears\nin kernel dmesg:\n  [   60.643604] verifier backtracking bug\n  [   60.643635] WARNING: CPU: 10 PID: 2315 at kernel/bpf/verifier.c:4302 __mark_chain_precision+0x3a6c/0x3e10\n  [   60.648428] Modules linked in: bpf_testmod(OE)\n  [   60.650471] CPU: 10 UID: 0 PID: 2315 Comm: test_progs Tainted: G           OE       6.15.0-rc4-gef11287f8289-dirty #327 PREEMPT(full)\n  [   60.654385] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n  [   60.656682] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n  [   60.660475] RIP: 0010:__mark_chain_precision+0x3a6c/0x3e10\n  [   60.662814] Code: 5a 30 84 89 ea e8 c4 d9 01 00 80 3d 3e 7d d8 04 00 0f 85 60 fa ff ff c6 05 31 7d d8 04\n                       01 48 c7 c7 00 58 30 84 e8 c4 06 a5 ff \u003c0f\u003e 0b e9 46 fa ff ff 48 ...\n  [   60.668720] RSP: 0018:ffff888116cc7298 EFLAGS: 00010246\n  [   60.671075] RAX: 54d70e82dfd31900 RBX: ffff888115b65e20 RCX: 0000000000000000\n  [   60.673659] RDX: 0000000000000001 RSI: 0000000000000004 RDI: 00000000ffffffff\n  [   60.676241] RBP: 0000000000000400 R08: ffff8881f6f23bd3 R09: 1ffff1103ede477a\n  [   60.678787] R10: dffffc0000000000 R11: ffffed103ede477b R12: ffff888115b60ae8\n  [   60.681420] R13: 1ffff11022b6cbc4 R14: 00000000fffffff2 R15: 0000000000000001\n  [   60.684030] FS:  00007fc2aedd80c0(0000) GS:ffff88826fa8a000(0000) knlGS:0000000000000000\n  [   60.686837] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  [   60.689027] CR2: 000056325369e000 CR3: 000000011088b002 CR4: 0000000000370ef0\n  [   60.691623] Call Trace:\n  [   60.692821]  \u003cTASK\u003e\n  [   60.693960]  ? __pfx_verbose+0x10/0x10\n  [   60.695656]  ? __pfx_disasm_kfunc_name+0x10/0x10\n  [   60.697495]  check_cond_jmp_op+0x16f7/0x39b0\n  [   60.699237]  do_check+0x58fa/0xab10\n  ...\n\nFurther analysis shows the warning is at line 4302 as below:\n\n  4294                 /* static subprog call instruction, which\n  4295                  * means that we are exiting current subprog,\n  4296                  * so only r1-r5 could be still requested as\n  4297                  * precise, r0 and r6-r10 or any stack slot in\n  4298                  * the current frame should be zero by now\n  4299                  */\n  4300                 if (bt_reg_mask(bt) & ~BPF_REGMASK_ARGS) {\n  4301                         verbose(env, \"BUG regs %x\\n\", bt_reg_mask(bt));\n  4302                         WARN_ONCE(1, \"verifier backtracking bug\");\n  4303                         return -EFAULT;\n  4304                 }\n\nWith the below test (also in the next patch):\n  __used __naked static void __bpf_jmp_r10(void)\n  {\n\tasm volatile (\n\t\"r2 = 2314885393468386424 ll;\"\n\t\"goto +0;\"\n\t\"if r2 \u003c= r10 goto +3;\"\n\t\"if r1 \u003e= -1835016 goto +0;\"\n\t\"if r2 \u003c= 8 goto +0;\"\n\t\"if r3 \u003c= 0 goto +0;\"\n\t\"exit;\"\n\t::: __clobber_all);\n  }\n\n  SEC(\"?raw_tp\")\n  __naked void bpf_jmp_r10(void)\n  {\n\tasm volatile (\n\t\"r3 = 0 ll;\"\n\t\"call __bpf_jmp_r10;\"\n\t\"r0 = 0;\"\n\t\"exit;\"\n\t::: __clobber_all);\n  }\n\nThe following is the verifier failure log:\n  0: (18) r3 = 0x0                      ; R3_w=0\n  2: (85) call pc+2\n  caller:\n   R10=fp0\n  callee:\n   frame1: R1=ctx() R3_w=0 R10=fp0\n  5: frame1: R1=ctx() R3_w=0 R10=fp0\n  ; asm volatile (\"                                 \\ @ verifier_precision.c:184\n  5: (18) r2 = 0x20202000256c6c78       ; frame1: R2_w=0x20202000256c6c78\n  7: (05) goto pc+0\n  8: (bd) if r2 \u003c= r10 goto pc+3        ; frame1: R2_w=0x20202000256c6c78 R10=fp0\n  9: (35) if r1 \u003e= 0xffe3fff8 goto pc+0         ; frame1: R1=ctx()\n  10: (b5) if r2 \u003c= 0x8 goto pc+0\n  mark_precise: frame1: last_idx 10 first_idx 0 subseq_idx -1\n  mark_precise: frame1: regs=r2 stack= before 9: (35) if r1 \u003e= 0xffe3fff8 goto pc+0\n  mark_precise: frame1: regs=r2 stack= before 8: (bd) if r2 \u003c= r10 goto pc+3\n  mark_preci\n---truncated---","modified":"2026-05-18T05:57:28.508530734Z","published":"2025-07-10T07:41:58.184Z","related":["SUSE-SU-2025:02853-1","SUSE-SU-2025:02923-1","SUSE-SU-2025:02969-1","SUSE-SU-2025:02996-1","SUSE-SU-2025:02997-1","SUSE-SU-2025:03011-1","SUSE-SU-2025:03023-1","SUSE-SU-2025:20577-1","SUSE-SU-2025:20586-1","SUSE-SU-2025:20601-1","SUSE-SU-2025:20602-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38279.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4265682c29c92f52c0da6fad5a79b5801462c8de"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ac49b7560b4b08b1e4043a29214cc7ad77644c00"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e2d2115e56c4a02377189bfc3a9a7933552a7b0f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38279.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38279"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"407958a0e980b9e1842ab87b5a1040521e1e24e9"},{"fixed":"4265682c29c92f52c0da6fad5a79b5801462c8de"},{"fixed":"ac49b7560b4b08b1e4043a29214cc7ad77644c00"},{"fixed":"e2d2115e56c4a02377189bfc3a9a7933552a7b0f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"fc2778c42f99c7de52fc004157b3c3ee4dcc208a"}]}],"versions":["v6.4.3","v6.4","v6.4.2","v6.4-rc7","v6.4-rc1","v6.4.1","v6.4-rc6","v6.4-rc5","v6.4-rc3","v6.4-rc4","v6.4-rc2","v6.3","v6.3-rc1","v6.3-rc7","v6.3-rc2","v6.3-rc3","v6.3-rc5","v6.3-rc6","v6.3-rc4","v6.2-rc6","v6.2-rc1","v6.2","v6.2-rc2","v6.2-rc8","v6.2-rc5","v6.2-rc4","v6.2-rc7","v6.2-rc3","v6.1-rc1","v6.1","v6.1-rc8","v6.1-rc3","v6.1-rc6","v6.1-rc7","v6.1-rc4","v6.1-rc2","v6.1-rc5","v6.0-rc1","v6.0","v6.0-rc7","v6.0-rc3","v6.0-rc2","v6.0-rc6","v6.0-rc4","v6.0-rc5","v5.19","v5.19-rc1","v5.19-rc5","v5.19-rc8","v5.19-rc6","v5.18","v5.19-rc2","v5.19-rc7","v5.19-rc3","v5.19-rc4","v5.18-rc1","v5.18-rc7","v5.18-rc2","v5.18-rc5","v5.17","v5.18-rc4","v5.18-rc3","v5.18-rc6","v5.17-rc6","v5.17-rc4","v5.17-rc8","v5.17-rc7","v5.17-rc1","v5.17-rc3","v5.17-rc2","v5.17-rc5","v5.16","v5.16-rc1","v5.16-rc8","v5.16-rc5","v5.16-rc6","v5.16-rc7","v5.16-rc3","v5.16-rc2","v5.16-rc4","v5.15","v5.15-rc2","v5.15-rc1","v5.15-rc4","v5.15-rc7","v5.15-rc3","v5.15-rc5","v5.15-rc6","v5.14","v5.14-rc3","v5.14-rc1","v5.14-rc2","v5.14-rc7","v5.14-rc6","v5.13-rc1","v5.14-rc5","v5.14-rc4","v5.13","v5.13-rc6","v5.13-rc7","v5.13-rc3","v5.13-rc2","v5.13-rc4","v5.13-rc5","v5.12","v5.12-rc2","v5.12-rc1-dontuse","v5.12-rc1","v5.12-rc8","v5.12-rc3","v5.12-rc7","v5.12-rc5","v5.12-rc6","v5.12-rc4","v5.10","v5.11","v5.11-rc3","v5.11-rc7","v5.11-rc6","v5.11-rc5","v5.11-rc1","v5.11-rc4","v5.11-rc2","v5.10-rc1","v5.10-rc7","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v5.10-rc2","v5.10-rc5","v5.9-rc1","v5.9-rc7","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.9-rc3","v5.9-rc2","v5.8","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v5.8-rc5","v5.8-rc3","v5.8-rc4","v5.8-rc6","v5.7-rc4","v5.7-rc7","v5.7-rc1","v5.7-rc3","v5.7-rc2","v5.7-rc5","v5.7-rc6","v5.6","v5.6-rc1","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.5","v5.5-rc5","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4","v5.5-rc4","v5.5-rc3","v5.5-rc6","v5.4-rc1","v5.4-rc6","v5.4-rc3","v5.4-rc4","v5.4-rc8","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v5.3-rc5","v5.3-rc1","v5.3-rc2","v5.3-rc3","v5.3-rc8","v5.3-rc7","v5.3-rc4","v5.2","v5.3-rc6","v5.2-rc2","v5.2-rc7","v5.2-rc4","v5.2-rc1","v5.2-rc5","v5.2-rc6","v5.2-rc3","v5.1","v5.0-rc8","v5.1-rc7","v5.1-rc1","v5.1-rc6","v5.1-rc5","v5.0","v5.1-rc3","v5.1-rc2","v5.1-rc4","v5.0-rc1","v5.0-rc4","v5.0-rc3","v5.0-rc6","v5.0-rc7","v5.0-rc2","v5.0-rc5","v4.20-rc1","v4.19","v4.20","v4.20-rc7","v4.20-rc5","v4.20-rc6","v4.20-rc4","v4.20-rc2","v4.20-rc3","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.19-rc1","v4.19-rc7","v4.19-rc6","v4.19-rc5","v4.19-rc3","v4.18","v4.18-rc1","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.18-rc6","v4.18-rc7","v4.17","v4.18-rc3","v4.18-rc4","v4.17-rc1","v4.17-rc2","v4.17-rc7","v4.17-rc3","v4.17-rc4","v4.16","v4.17-rc6","v4.17-rc5","v4.16-rc7","v4.16-rc4","v4.16-rc1","v4.16-rc2","v4.16-rc5","v4.16-rc3","v4.16-rc6","v4.14","v4.15","v4.15-rc1","v4.15-rc4","v4.15-rc9","v4.15-rc8","v4.15-rc7","v4.15-rc3","v4.15-rc2","v4.15-rc5","v4.15-rc6","v4.14-rc1","v4.14-rc7","v4.14-rc3","v4.13","v4.14-rc8","v4.14-rc4","v4.14-rc6","v4.14-rc2","v4.14-rc5","v4.13-rc2","v4.13-rc1","v4.13-rc3","v4.13-rc7","v4.13-rc4","v4.13-rc5","v4.13-rc6","v4.12-rc1","v4.12","v4.12-rc5","v4.12-rc7","v4.12-rc6","v4.12-rc4","v4.12-rc2","v4.12-rc3","v4.11","v4.11-rc1","v4.11-rc6","v4.11-rc8","v4.11-rc7","v4.11-rc3","v4.11-rc5","v4.11-rc2","v4.11-rc4","v4.10","v4.9","v4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