CVE-2026-89783— xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
In the Linux kernel, the following vulnerability has been resolved: xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full The depth check in xfrm6_input_addr() is off by one: if (1 + sp->len == XFRM_MAX_DEPTH) goto drop; ... sp->xvec[sp->le
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I. Basic Information for CVE-2026-89783
Vulnerability Information
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Vulnerability Title
xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
The depth check in xfrm6_input_addr() is off by one:
if (1 + sp->len == XFRM_MAX_DEPTH)
goto drop;
...
sp->xvec[sp->len++] = x;
xfrm_input() can leave sp->len == XFRM_MAX_DEPTH, and the transport-mode
receive path re-enters IPv6 input via xfrm_trans_reinject() with that
secpath preserved. If the inner packet carries a destination-options HAO
option or a type-2 routing header, xfrm6_input_addr() is called with
sp->len == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so
sp->xvec[sp->len++] writes one slot past the 6-element xvec[]. The write
stays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS
flags it and panics under panic_on_warn.
Use "sp->len >= XFRM_MAX_DEPTH", matching xfrm_input(). This also
restores one chain level the old check rejected at sp->len == 5.
UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10
index 6 is out of range for type 'xfrm_state *[6]'
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-89783
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Other References for CVE-2026-89783 (8)
Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total
| CVE-2026-89860 | scsi: qla2xxx: Initialize NVMe abort_work once at submission | |
| CVE-2026-89877 | media: saa7164: fix cleanup on resource allocation failure | |
| CVE-2026-89875 | media: ti: vpe: quiesce overflow recovery before freeing streams | |
| CVE-2026-89876 | media: tda18250: fix possible integer overflow | |
| CVE-2026-89874 | media: v4l2-async: avoid deleting unlinked ASC entry on link error | |
| CVE-2026-89872 | media: v4l2-fwnode: Fix fwnode leak in v4l2_fwnode_parse_link | |
| CVE-2026-89873 | media: v4l2-ctrls: validate HEVC EXT SPS RPS counts | |
| CVE-2026-89871 | media: video-i2c: fix kthread error pointer left in kthread_vid_cap on failure | |
| CVE-2026-89870 | media: zoran: Avoid freeing a registered video_device twice | |
| CVE-2026-89869 | media: qcom: iris: use disable_irq() during power-off | |
| CVE-2026-89868 | media: chips-media: wave5: Add timeout while stop_streaming | |
| CVE-2026-89867 | media: chips-media: wave5: Defer job_finish() only when a DEC_PIC was queued | |
| CVE-2026-89866 | media: chips-media: wave5: Resume device before setting EOS flag | |
| CVE-2026-89865 | scsi: qla2xxx: Zero SFP DMA buffer in FRU/I2C bsg handlers | |
| CVE-2026-89864 | scsi: qla2xxx: Bound i2c->length in I2C bsg handlers | |
| CVE-2026-89863 | scsi: qla2xxx: edif: Fix NULL pointer deref in RX SA delete check | |
| CVE-2026-89862 | scsi: qla2xxx: Fix BSG job leak on validate flash image error path | |
| CVE-2026-89861 | scsi: qla2xxx: Hold vport reference in qla24xx_report_id_acquisition() | |
| CVE-2026-89850 | scsi: qla2xxx: Don't query firmware state while chip is down | |
| CVE-2026-89848 | scsi: qla2xxx: Quiesce response IRQ before freeing request queue |
Showing top 20 of 276 CVEs. View all on vendor page → →
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V. Comments for CVE-2026-89783
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